Manual AT&T 1987 AT&T

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AT&T 1987 AT&T - page 1

555-520-200 Issue 1, June 1987 AT&T System 25 Reference Manual ...
AT&T 1987 AT&T - page 2

© 1987 AT&T All Rights Reserved Printed in USA TO ORDER COPIES OF THIS DOCUMENT REFER TO DOCUMENT NUMBER 555-520-200. Contact: Your AT&T sales representative or Call: 800-432-6600, Monday to Friday between 7:30 am and 6:00 EST, or Write: AT&T Customer Information Center 2855 North Franklin Road P.O. Box 19901 Indianapolis, Indiana 4621 ...
AT&T 1987 AT&T - page 3

FCC NOTIFICATION AND REPAIR INFORMATION AT&T SYSTEM 25 This telephone equipment is registered with the Federal Communications Commission (FCC) in accordance with Part 68 of its Rules. In compliance with the Rules, be advised of the following: MEANS OF CONNECTION Connection of this telephone equipment to the nationwide telecommunications network ...
AT&T 1987 AT&T - page 4

RIGHTS OF THE TELEPHONE COMPANY If your telephone equipment causes harm to the telephone network, the telephone company may discontinue your service temporarily. If possible, they will notify you in advance. But if advance notice isn’t practical, you will be notified as soon as possible. You will be informed of your right to file a complaint with ...
AT&T 1987 AT&T - page 5

FCC WARNING STATEMENT Federal Communications Commission (FCC) Rules require that you be notified of the following: ● This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause interference to radio communications. ● It has been tested and found to co ...
AT&T 1987 AT&T - page 6

CONTENTS SECTION l—OVERVIEW SECTION 2—FEATURES AND SERVICES SECTION 3—FUNCTIONAL DESCRIPTION SECTION 4—HARDWARE DESCRIPTION SECTION 5—TECHNICAL SPECIFICATIONS SECTION 6—ENVIRONMENTAL REQUIREMENTS SECTION 7—PARTS INFORMATION SECTION 8—REFERENCE DOCUMENTATION SECTION 9—GLOSSARY SECTION 10—INDEX ...
AT&T 1987 AT&T - page 7

SECTION 1—OVERVIEW This reference manual provides general technical information on AT&T System 25 (System 25). It includes a description of the system, its hardware and software, features and services, environmental requirements, and technical specifications. This manual is intended to serve as an overall technical reference for System 25. Th ...
AT&T 1987 AT&T - page 8

System 25 Description System 25 (Figure l-l) is an advanced digital switching system that integrates voice and data communications. It not only provides the features of a state-of-the-art PBX, but goes a step further by allowing data to be switched point-to-point without first being converted to analog format. This capability can be used to set up ...
AT&T 1987 AT&T - page 9

DIGITAL SWITCH EMERGENCY TRANSFER -48V DC UNIT UNIT SINGLE-LINE ANALOG VOICE TERMINALS MULTILINE VOICE HYBRID TERMINALS DIRECT TRUNK ATTENDANT CONSOLE OR HYBRID ASYNCHRONOUS DATA RS-232C DAT A HOST COMPUTERS SWITCHED LOOP ATTENDANT CONSOLE TERMINALS UNIT (ADU) ATTENDANT DIRECT HYBRID EXTENSION SELECTOR CONSOLE STARLAN NETWORK WORKSTATIONS STARLAN N ...
AT&T 1987 AT&T - page 10

Call Handling Capabilities System 25 can be arranged as a stand-alone system or can be part of a private network. The system provides 256 ports to support the following: ● 115 simultaneous two-party conversations ● Traffic Handling Capacity of 4140 CCS/Hour (Trunking Limited) ● Busy Hour Call Capacity of 2500 calls (DTMF Register Limited) ● ...
AT&T 1987 AT&T - page 11

Incoming Business Communications Successful call termination is the key to capturing all incoming communications associated with revenue issues, client inquiries, decision data, etc. Call termination involves identifying the called party and routing the call to a primary or secondary answering position. System 25 provides powerful tools for both ca ...
AT&T 1987 AT&T - page 12

supported by secretarial service and equipped with economical single-line phones. When alternate resources are not available to handle an incoming call, System 25 provides for attendant handling of the call utilizing camp-on, redirection and/or message service. ● Camp-On allows the attendant to extend an outside call to a busy station. A burst of ...
AT&T 1987 AT&T - page 13

Ease of access to multiple types of network facilities (provided for minimum cost) is managed by: ● Automatic Route Selection (ARS) allows the customer to dial a standard DDD number. ARS selects the preferred route and does any number conversions required for the facilities selected. ● System 25’s Virtual Facility feature provides convenient ...
AT&T 1987 AT&T - page 14

● Automatic Intercom allows multiline voice terminal users to call each other by use of a dedicated line appearance. A private dedicated path ensures that a path is always available. This feature is frequently used in Boss/Secretary arrangements. ● The Dial Plan for System 25 is based on the concept that, whenever possible, calls should be plac ...
AT&T 1987 AT&T - page 15

● Circuit switched data communications up to 19,200 bps (RS232 interface). This provides circuit switched connections from asynchronous data terminals, PCs, or host computers to host computers or network facilities. Users can be located and/or moved to any on-premises office equipped with the standard AT&T four-pair wiring plan. Thus an async ...
AT&T 1987 AT&T - page 16

● Terminal Dialing provides the user with fast access to data communications via keyboard dialing at a terminal or PC. ● Command Mode provides a menu of data services supporting terminal dialing, and display and control of user data port options. A user friendly Change Options menu is provided for user administration of data options. ● Expert ...
AT&T 1987 AT&T - page 17

Figures 1 and 2.) Every circuit slot in the system can be used for trunk cards or voice/data station cards. All these attributes allow the client to add future capability without breakage and re-engineering of existing equipment. Thus, the client is able to minimize initial investment while not restricting future growth. Over time, the type of tool ...
AT&T 1987 AT&T - page 18

Types of trunks which can be assigned in System 25 are: ● Central Office, which provide a link with the local telco for incoming and outgoing calls (LS/GS) ● Foreign Exchange (FX), which connect to a CO other than the local CO for high volume calling from a distant location ● Wide-Area Telecommunications Service (WATS), which connect to an Ou ...
AT&T 1987 AT&T - page 19

USER CHANGEABLE OPTIONS (V2) . . . . . . . . . . . . . VIRTUAL FACILITIES (V2) . . . . . . . ● . . . . ● . . ● ● LIST OF FIGURES Figure 2-1. Direct Trunk Attendant Console . . . . . . . . . . . . . . Figure 2-2. Direct Trunk Attendant Console Connections . . . . . . . . . Figure 2-3. Switched Loop Attendant Console . . . . . . . . . . . . . ...
AT&T 1987 AT&T - page 20

Figure 2-26. Figure 2-27. Figure 2-28. Figure 2-29. Figure 2-30. Figure 2-31. Figure 2-32. Figure 2-33. Figure 2-34. Figure 2-35. Figure 2-36. Figure 2-37. Figure 2-38. Figure 2-39. Figure 2-40. Figure 2-41. Figure 2-42. Figure 2-43. Figure 2-44. Figure 2-45. Figure 2-46. Figure 2-47. Figure 2-48. Figure 2-49. Figure 2-50. Figure 2-51. 500A/502A He ...
AT&T 1987 AT&T - page 21

TABLE 2-A. System Features . . . . . . . . . . . . . . . . . . . TABLE 2-B. Network Features . . . . . . . . . . . . . . . . . . TABLE 2-C. Data Features.. . . . . . . . . . . . . . . . . . . TABLE 2-D. Station Features . . . . . . . . . . . . . . . . . . . TABLE 2-E. Attendant Features . . . . . . . . . . . . . . . . . . TABLE 2-F. Partial List of ...
AT&T 1987 AT&T - page 22

SECTION 2—FEATURES AND SERVICES This section describes the System Features, Network Features, Data Features, Station Features, and Attendant Features of AT&T System 25. It also covers certain services that support and implement the features; included in this category are the digital tape unit, the dial plan, system administration, and system ...
AT&T 1987 AT&T - page 23

System Features System features (Table 2-A) are those that affect the entire operation of the system. All system features are available with both Vl and V2. TABLE 2-A. System Features FEATURE NAME FEATURE TYPE * Call Accounting O Dial Plan S Dictation System Access O Digital Tape Unit O Direct Group Calling S Direct Group Calling Delay Announcement ...
AT&T 1987 AT&T - page 24

Network Features This group of features (Table 2-B) supports communications with the public network and with other locations in the private network of which System 25 can be a part. TABLE 2-B. Network Features FEATURE NAME FEATURE TYPE * Automatic Route Selection S Direct Inward Dialing O Off-Premises Stations O Tandem Trunking (V2) O Tie Trunks O ...
AT&T 1987 AT&T - page 25

Station Features The many Station Features (Table 2-D) available allow individual user needs to be met. As these needs change, assigned features can also be changed. Station Features provide many important services that help save time and make calling more convenient. TABLE 2-D. Station Features FEATURE NAME SINGLE-LINE MULTILINE TERMINAL FEATURE T ...
AT&T 1987 AT&T - page 26

Attendant Features Attendant Features (Table 2-E) are available to the attendant using the Direct Trunk Attendant Console (DTAC) or the Switched Loop Attendant Console (SLAC) (V2 only) and (optionally) a Direct Extension Selector Console. In addition, most multiline voice terminal station features are available to the attendant. TABLE 2-E. Attendan ...
AT&T 1987 AT&T - page 27

ACCOUNT CODE ENTRY Description Allows voice terminal users to associate an account code with incoming and outgoing calls. This is accomplished by entering the account code at the voice terminal before hanging up. The account code is appended to the SMDR call record and can be used later for accounting or billing purposes. To association account cod ...
AT&T 1987 AT&T - page 28

Interactions ● Conference: If more than one user attempts to enter an account code on a Conference Call, the first to enter a code will prevail. ● Repertory Dialing: An Account Code can be stored on a REP DIAL button. Press REP DIAL after ACCT ENTRY has been pressed. ● Speed Dialing: An Account code can be stored in System or Personal Speed D ...
AT&T 1987 AT&T - page 29

ATTENDANT CALL EXTENDING Description Allows the attendant to put a call in a special hold condition, call another station, then connect the two calls together. The attendant can withdraw from the connection and separate the call from the console or remain connected to the other parties. Attendant Call Extending is a feature used at either a Direct ...
AT&T 1987 AT&T - page 30

Considerations Attendant Call Extending allows the attendant to utilize the additional attendant related features such as Attendant Splitting One-Way (automatically places incoming canon hold), Release, Cancel, Return-On-Don’t-Answer, Return-On-Busy, Forced Release (SLAC), Join (SLAC), and Source/Destination (SLAC). Interactions Refer to the othe ...
AT&T 1987 AT&T - page 31

ATTENDANT CAMP-ON Description Allows the attendant to extend a trunk call to a busy voice terminal and leave it waiting or “camped on” there. After hearing busy tone, the attendant presses RELEASE to camp-on this call at the busy terminal. When this is done, a burst of tone is heard in the handset of the called terminal and the caller is placed ...
AT&T 1987 AT&T - page 32

Administration Requirements System: ● Number of seconds before a camped-on call returns to the Attendant Console (1-120 seconds) or No Attendant Camp-On allowed (0) - Default = 30 seconds. 2-11 Hardware Requirements None ...
AT&T 1987 AT&T - page 33

ATTENDANT CANCEL Description Allows the attendant to terminate an attempt to extend any incoming call if the called station does not answer, or if the station answers but declines to accept the call. Before pressing RELEASE, the attendant presses CANCEL and is automatically reconnected to the calling party. Pressing CANCEL when the Start facility i ...
AT&T 1987 AT&T - page 34

ATTENDANT CONSOLE, DIRECT TRUNK Description In System 25, the Attendant Console is used to answer incoming trunk calls that are not directed to specific user stations, to answer calls from inside users, to extend calls to inside stations and outside numbers, and to assist system users in placing outgoing calls and setting up conferences. The attend ...
AT&T 1987 AT&T - page 35

● Return-On-Don’t-Answer [RTN-DA]: Extended calls not answered are returned to the console on this button if not answered within a specified interval. ● Attendant Message Waiting [ATT MSG]: Used by the attendant to remotely control Message LEDs on voice terminals. ● Alarm [ALARM]: The associated status LED flashes when a system trouble has ...
AT&T 1987 AT&T - page 36

terminations on the rightmost two columns of buttons of the inactive console. Ringers disabled on an inactive console will be enabled on the active console for those trunks with dual appearances (appearances on both consoles). All other features on all buttons, including those on the associated Attendant Direct Extension Selector Console will conti ...
AT&T 1987 AT&T - page 37

— Release ● Trunk terminations–The following is required for each trunk terminated on the console (administered as Personal Line appearances; DID trunks cannot b e terminated on a DTAC): Trunk Number — Make this the Principal Station (owner) of the trunk (Yes, No) — Enable Ring (Yes, No). Hardware Requirements Each console requires a port ...
AT&T 1987 AT&T - page 38

ATTENDANT CONSOLE, SWITCHED LOOP (V2) Description In System 25, the Attendant Console is used to answer incoming trunk calls that are specified to ring at an attendant position, to answer calls from inside users, to extend calls to inside stations and outside numbers, to assist system users in placing outgoing calls, and to set up conferences. The ...
AT&T 1987 AT&T - page 39

In addition to the LOOP buttons and standard multiline terminal buttons (HOLD , TRANSFER, etc.), the console is equipped with the following feature buttons that provide unique ● ● ● ● ● ● ● ● ● ● ● ● ● ● attendant functions. Unless noted, the buttons have green status LEDs. Start [START]: Initiates the call extending pro ...
AT&T 1987 AT&T - page 40

● Manual Signaling ● Transfer to Data ● Account Code Entry ● Auto Intercom ● Auto Answe r ● Direct Facility Access ● Direct Station Selection (DSS) ● Flex DSS ● Repertory Dialing. The last two features can be programmed with dialable numbers by the attendant. When a call is placed using a Flex DSS button or a Repertory Dial button ...
AT&T 1987 AT&T - page 41

Switched Loop Operation All calls that are intended for an attendant position are first routed by the system to a common queue where they wait to be sent to a console. In a configuration having two consoles, the same queue serves both consoles. When an attendant console becomes available to receive a call, the system removes a call from the queue a ...
AT&T 1987 AT&T - page 42

An incoming call from the queue to a console appears on one of the five LOOP buttons; the attendant is alerted to the call by audible ringing, a steadily lighted red lamp, and a flashing green lamp. While the call is ringing and while the attendant is handling the call, the system will direct no more calls to the console. After the attendant ends o ...
AT&T 1987 AT&T - page 43

from the common queue while the console is unavailable. If this is not done, the button should be reassigned to another of the permissible features. In a two-console configuration, an attendant in Position Busy mode will be covered by the other attendant. Only one console can be in Position Busy mode at a time. Call Types The following types of att ...
AT&T 1987 AT&T - page 44

Call Originations Placing a new call from an active console causes interactions with the currently active call. At a console that has the default Automatic Release feature, the active call is dropped when the attendant presses anew LOOP button. The new loop becomes the active one; dial tone is provided, and the attendant can dial a number. If the o ...
AT&T 1987 AT&T - page 45

● Assign call type priorities and attendant specification. ● Assign call types and attendant specification for Message Center-Like operation in a two-console configuration. ● Assign Position Busy “backup’’ station, inapplicable. Hardware Requirements Each console requires a port on a ZTN79 ATL Station circuit pack. Figure 2-5 provides a ...
AT&T 1987 AT&T - page 46

ATTENDANT DIRECT EXTENSION SELECTION Description Permits the attendant to extend calls to stations by pressing one or two buttons instead of pressing START and dialing the PDC or DDC. Each attendant console in a system can have an associated Direct Extension Selector Console. A Selector Console can be used with either a Direct Trunk Attendant Conso ...
AT&T 1987 AT&T - page 47

90 80 70 ❑ 60 50 40 30 ❑ 20 ❑ 10 00 ❑ ❑ ❑ ❑ 91 81 71 61 51 ❑ 41 31 ❑ 21 11 01 ❑ ❑ ❑ ❑ ❑ ❑ 92 82 ❑ 72 62 52 ❑ 42 32 22 12 02 ❑ ❑ ❑ 93 83 73 63 ❑ 53 ❑ 43 33 ❑ 23 13 03 ❑❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ 100 DXS ❑ ❑ ❑ ❑ ? ...
AT&T 1987 AT&T - page 48

The rightmost button on the bottom of the console is a Test button. When it is pressed, all DXS LEDs will light sequentially; a second press allows individual LEDs to be tested and a third press ends the test. Considerations When there are two Attendant Selector Consoles in the system the Group Select button assignments are identical. Whenever an a ...
AT&T 1987 AT&T - page 49

Administration Requirements Special Feature Ports: ● Requires a port assignment on a ZTN79 ATL Station Circuit Pack (CP) for each Selector Console. ● Assign Group Select button hundreds groups. System: ● Assign Attendant Call Park codes. Hardware Requirement s Requires an Attendant Selector Console, and a port interface on a ZTN79 ATL Station ...
AT&T 1987 AT&T - page 50

ATTENDANT DISPLAY (V2; SLAC Only) Description Provides displays of call-related information on a 16-character screen at the top of the Switched Loop Attendant Console (SLAC). The following types of data are automatically presented for calls handled at the console: ● The extension number and name of an inside party called from the console ● The ...
AT&T 1987 AT&T - page 51

p for Call Park o for not logged-in FPDC. ● Number of calls waiting in the common queue (l-9 or ! for 10 or more) ● Trunk identification for incoming outside calls ● Conference information. Considerations The attendant display provides pertinent information about the currently active call. The following examples show some typical screens. Inc ...
AT&T 1987 AT&T - page 52

Returning parked call: I }801 Park 4 The call parked on extension 801 at the Selector Console is returning to the attendant. Call from console to system user: 1728 Burns, R ! The extension number and name of the called party are presented. The ! symbol indicates that 10 or more calls are waiting in the queue. Outgoing trunk call: 912126378888 The d ...
AT&T 1987 AT&T - page 53

The call from Carter has been split while the call is extended. After the attendant dials the desired PDC, screen 1 displays called party identification, and screen 2 remains unchanged: &1397 Phelps, T 7 2344 Carter, M & If the attendant now presses RELEASE, both screens go blank. If the attendant presses JOIN, the two parties and the conso ...
AT&T 1987 AT&T - page 54

Pressing any button other than thos e listed above causes a message such as “NO INFORMATION” to be displayed. Timer Functions The LOCAL button allows the attendant to have access to the Timer controls on the left side of the display module. In the local mode, the screen can provide clock, calendar, timer, and alarm functions. The local mode is ...
AT&T 1987 AT&T - page 55

ATTENDANT FORCED RELEASE (V2; SLAC Only) Description Drops all active parties from a call in which the attendant and one or more other parties are connected together. The attendant uses the feature by pressing the FORCED RELEASE button while connected to other callers in a conference-type call. The other parties will be disconnected from the consol ...
AT&T 1987 AT&T - page 56

ATTENDANT JOIN (V2; SLAC Only) Description Allows the attendant, while extending an incoming call, to connect together the calling party, the called party, and the console in a 3-way call. All parties can talk to each other. The attendant activates the feature by pressing the JOIN button while still connected to one of the other parties. Considerat ...
AT&T 1987 AT&T - page 57

ATTENDANT MESSAGE WAITING Description Allows the attendant to remotely control the status of Message LEDs on user stations. Considerations This feature allows the attendant to notify stations that a message is available for them. The attendant can activate the Message LED of the station while either (1) ringing, (2) receiving Busy Tone, or (3) talk ...
AT&T 1987 AT&T - page 58

ATTENDANT POSITION BUSY Description Allows an Attendant Console to be placed in an inactive mode. Systems with Direct Trunk Attendant Console(s) (DTAC) There must be two Attendant Consoles in the system before this feature can be activated. A Position Busy (POS BUSY) button can be assigned on each of the consoles. Pressing POS BUSY at one of two ac ...
AT&T 1987 AT&T - page 59

A console in Position Busy mode can receive attendant PDC, DID, and DGC calls, and outgoing calls can still be placed. Local functions can be activated. Considerations Position Busy allows one of two attendant positions to be made inactive when not required. This is useful in situations where calling traffic requires only one console operator. Inte ...
AT&T 1987 AT&T - page 60

. Personal Lines (Trunk Appearances) on DTACs : All calls to trunks having an appearance in either of the two leftmost button columns will ring normally at the inactive console. All calls to trunks having appearances in either of the two rightmost button columns will not ring. If these trunks also have an appearance at the active console, they will ...
AT&T 1987 AT&T - page 61

ATTENDANT RELEASE Description Releases the attendant from an extended call. There are two forms of Attendant Release: Manual and Automatic. This feature applies to the Direct Trunk Attendant Console (DTAC) and the Switched Loop Attendant Console (SLAC). Manual Release: Pressing RELEASE releases the attendant from an extended call and completes the ...
AT&T 1987 AT&T - page 62

Interactions ● Attendant Camp-On: External calls that are released when Busy Tone is heard will be camped on. Administration Requirements None. Hardware Requirements None. 2-41 ...
AT&T 1987 AT&T - page 63

ATTENDANT RETURN COVERAGE ON BUSY Description Allows a camped-on call at a busy station or DGC Group to be returned to the attendant for service after a specified time period. A camped-on call not answered within 1 to 120 seconds (administrable) after the attendant releases the call will return to the console in one of the following ways: ● On th ...
AT&T 1987 AT&T - page 64

. Send All Calls (DTAC only): If Send Al ring at the DTAC. Administration Requirements System: Calls is activated, returning calls will . Assign number of seconds before unanswered camped-on calls return to the Attendant Position (1-120 seconds, or O for No Camp-On) - Default = 30 seconds. Hardware Requirements None 2-43 ...
AT&T 1987 AT&T - page 65

ATTENDANT RETURN COVERAGE ON DON’T ANSWER Description Allows unanswered calls extended by the attendant to be returned to the attendant for additional service. Calls that are not answered after a specified number of rings will transfer ringing to the Return-On-Don’t-Answer (RTN-DA) button on a Direct Trunk Attendant Console (DTAC) or to a LOOP ...
AT&T 1987 AT&T - page 66

call). ● Send All Calls (DTAC only): If Send All Calls is activated, returning calls will ring at the DTAC. Administration Requirements System: ● Assign number of rings before call return to the Attendant Position (1-31) - Default = 5 Rings. Hardware Requirements None 2-45 ...
AT&T 1987 AT&T - page 67

ATTENDANT SOURCE AND DESTINATION (V2; SLAC Only) Description Allows the attendant, while extending a call, to switch back and forth between the calling party (the source) and the called party (the destination) before connecting them together. Pressing the SOURCE button on the SLAC after the called party has been reached has these results: ● The c ...
AT&T 1987 AT&T - page 68

ATTENDANT SPLITTING ONE-WAY AUTOMATIC Description Allows the attendant to converse privately with a called party while the calling party is split away on hold. When the attendant presses START (or a DXS button) to extend an incoming call to a called party, the calling party is automatically split away from the connection and placed on hold. This al ...
AT&T 1987 AT&T - page 69

ATTENDANT SYSTEM ALARM INDICATION Description Provides an Alarm on the Attendant Console to alert the attendant to problems detected by the system software. The ALARM LED on the Attendant Console will flash whenever a detected fault persists longer than four minutes, or if more than five transient faults per hour are detected. The alarm indication ...
AT&T 1987 AT&T - page 70

AUTOMATIC INTERCOM Description Allows a multiline voice terminal user (or attendant) to place and answer calls to and from another station by use of a dedicated button appearance. Automatic Intercom provides a private path between two designated multiline voice terminals. To place an Automatic Intercom call, the calling party presses the Automatic ...
AT&T 1987 AT&T - page 71

● Call Pickup: When an Automatic Intercom call is picked up via Call Pickup, the AUTO ICOM status LED on the called voice terminal lights steadily. The called party can press AUTO ICOM to enter the call at any time. ● Direct Group Calling: Automatic Intercom calls cannot be directed to DGC groups. ● Exclusion: Any attempt to engage Exclusion ...
AT&T 1987 AT&T - page 72

AUTOMATIC ROUTE SELECTION (ARS) Description Provides for the routing of calls over the telecommunications network based on preferred routes (normally the least expensive route available at the time the call is placed.) An ARS pattern can be composed of two subpatterns (time of day determines which subpattern is selected), each consisting of up to t ...
AT&T 1987 AT&T - page 73

— FNPA calls made to numbers specified in the FNPA Exception List. — All other FNPA calls. ARS Flow Chart Figure 2-8 provides a simplified ARS flow chart. Bracketed numbers (e.g., [401], [601]) provide a link between ARS administrable action numbers and the associated item on the flow chart. Certain readers may find this reference useful when r ...
AT&T 1987 AT&T - page 74

V1 Systems Only: For calls outside the HNPA (FNPA calls), a check is made against a non-administrable Special Numbers List. The numbers in the list include all “800” and “900” numbers and Telex codes 510, 610, 710, and 810. If a match is found, the call is routed via the local CO facility. For FNPA calls not on the Special Numbers List (Vi) ...
AT&T 1987 AT&T - page 75

STATION USER DIALS ARS ACCESS CODE [401] NUMBER DIALED ON EMERGENCY NUMBERS LIST (911, AND THREE CUSTOMER NO DEFINED 7-DIGIT NUMBERS NO [601-603] I VOICE TERMINALS “RESTRICT OUTWARD CALLS” = YES STATIONS [13] YES YES YES CALL ROUTED VIA LOCAL CO FACILITY CALLING USER RECEIVES SYSTEM REORDER TONE VOICE TERMINAL ASSIGNED TOLL RESTRICTION CLASS 1- ...
AT&T 1987 AT&T - page 76

FROM SHEET 1 NUMBER DIALED WITHIN HOME NPA? SYSTEM [30] YES NO AREA CODE ON YES NPA ROUTING TABLE [300 ] NUMBER DIALED ON HOME NPA EXCEPTION LISTS [500] V1 ONLY: NUMBER DIALED ON SPECIAL NUMBERS LIST (ALL 800,900, AND TELEX 510, NUMBER DIALED ON FNPA NO EXCEPTION YES CALL ROUTED LIST VIA ASSOCIATED ROUTING PATTERN 610, 710, AND 810 CODES ) YES CALL ...
AT&T 1987 AT&T - page 77

The following tones are associated with ARS: ● Confirmation–Indicates that a queued call is being serviced (trunk available to route call ) ● Busy—Indicates that the called number is busy ● Reorder–Indicates that all trunks are busy, the ARS queue is full, or that ARS calling is denied. ● Preferred Route Tone—Five very short tones t ...
AT&T 1987 AT&T - page 78

● Direct Facility Access Button: Multiline voice terminal users who have pressed FACILITY to activate the busy-to-idle reminder must wait until all queued ARS users have been serviced. ● Virtual Facilities (V2 only): Virtual Facilities may be used in place of trunk groups in ARS routing patterns. When used with ARS, a digit translation scheme m ...
AT&T 1987 AT&T - page 79

— Subpattern A Start and End Time (Hour: Minute) — Subpattern A and B–Route 1, 2, and 3 Facility Access Codes (1-9999) or, in V2, Virtual Facility Codes (#190-#199) Subpattern A and B—Route 1, 2, and 3 FRLs (0-3) — Subpattern A and B Overflows to CO facility (Yes, No) Subpattern A and B Overflow FRL (0-3). Terminal (Station Port) ● ARS ...
AT&T 1987 AT&T - page 80

ROUTING PATTERNS (1-8) [100] NO [ 200] ROUTING SUBPATTERNS (RSP) A AND B RSP A ROUTE 1 ROUTE 2 ROUTE 3 START/ STOP TIME [101], [102] POOLED FACILITY ACCESS CODE [110] POOLED FACILITY ACCESS CODE [120] POOLED CO FACILITY OVERFLOW ACCESS FLAG CODE [130] [140] FRL (0-3) FRL (0-3) FRL (0-3) FRL (0-3) [111] [121] [131] [141] RSP B ROUTE 1 POOLED FACILIT ...
AT&T 1987 AT&T - page 81

BUSY-TO-IDLE REMINDER Description Enables a multiline voice terminal user to be alerted by a single ring as soon as a busy internal station, DGC group, or facility (trunk group) becomes available. The feature can be activated only for stations, DGC groups, and trunk groups represented on the terminal by DSS, FLEX DSS, AUTO ICOM, and FACILITY button ...
AT&T 1987 AT&T - page 82

CALL ACCOUNTABILITY Description Allows system users to charge outside calls made from other users’ stations to their own PDCs. To charge a call to his or her own PDC, the user dials ## followed by the PDC immediately upon receiving first dial tone to place a call. When second dial tone is returned, the user dials the desired number in the normal ...
AT&T 1987 AT&T - page 83

CALL ACCOUNTING Call Accounting is the collecting, processing, and use of information about all trunk calls placed from and received by System 25. It is intended to help customers control telephone use and manage associated costs. Detailed call data is available at Interface Port 3 of the Digital Switch’s Call Processor Circuit Pack. This data ca ...
AT&T 1987 AT&T - page 84

. Data Records: The system prints call records for incoming and outgoing (external) data calls. Calls are considered data calls if they involve a data extension. The following list describes the SMDR data collected for each call and the number of characters in each field. All information is right justified in its field, unless otherwise indicated. ...
AT&T 1987 AT&T - page 85

number of voice terminals will reflect the total call duration. The maximum time that can be reported is 95 hours, 59 minutes, and 59 seconds. . Blank (Column 46) . FAC (Columns 47-51- Facility) Indicates the facility used to place the call. For outgoing calls including speed dialed numbers, the pooled facility selected by ARS or the facility acces ...
AT&T 1987 AT&T - page 86

Interactions . Account Code Entry: Allows users to have an account code or project number associated with each call record. . Direct Group Calling (DGC): For an incoming call to a DGC group that is connected to an announcement and never answered, “O” will be reported in the “STN” field of the call record. If the call is answered by a statio ...
AT&T 1987 AT&T - page 87

Description CAS Model 100: The CAS 100, when connected to a serial printer and the System 25 SMDR port, calculates the cost of calls made to outside numbers, stores the cost information, and generates chronological and summary reports. After each incoming or outgoing call is completed, a call record is printed on the Chronological Report. Each call ...
AT&T 1987 AT&T - page 88

The CAS performs three main functions; (l) call record processing, (2) report generation, and (3) CAS system management. In addition, a limited directory lookup and message center is provided. The followings a brief description of each function: 1. Process Calls: Involves screening call records, calculating the cost of valid calls, anti storing the ...
AT&T 1987 AT&T - page 89

The following table summarizes CAS station and account code capacities. AT&T CALL ACCOUNTING SYSTEMS CAS Model Stations Account Codes 200 100 5000 300 150 5000 500 500 5000 2000 2000 15000 Refer to the CAS documentation supplied with the software package for additional information. Considerations The CAS provides customers with an efficient too ...
AT&T 1987 AT&T - page 90

C C C D C C C D D C C C C C C C C C D C C C C C DATE 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 10/08/85 TIME 11:14 11:14 11:15 11:17 11:19 11:20 11:34 11:44 11:50 12:14 12:24 13:27 13:1 ...
AT&T 1987 AT&T - page 91

ASCII CHARACTER POSITION (Column Number) 01 02 03-04 05 06-07 08 09-10 11 12-13 14 15-16 17 18-35 36 37 38-39 40 41-42 43 44-45 46 47-51 52 53-56 57-58 59-73 74 75-78 79 80 DESCRIPTION Call Type Space Date: Month / Date: Day / / / Date:Year Space Time:Hour Time: Minute Space Dialed Number Error Character Space Duration:Hour Duration: Minute Duratio ...
AT&T 1987 AT&T - page 92

ASCII CHARACTER POSITION 00 01-03 04-07 08-12 13-16 17-23 24-29 30 31-36 37-38 39-41 42-48 49-51 52-54 55-57 58-62 63-69 70-76 77-79 80 81 DESCRIPTION (top of form) Space DAT E Space TIM E Space CALLE D Space NUMBE R Space DU R Space FA C Space STN Space ACCOUN T Space PD C (Carriage Return) (Line Feed) Figure 2-12. SMDR Call Record Header Format 2 ...
AT&T 1987 AT&T - page 93

SYSTEM 25 PART OF CABINET OCTOPUS CABLE — — — PART OF ZTN82 SIP SMDR OUTPUT — — — OR ZTN128 C2 Z21OA C1 . 355A/AF DEVICE/CALL CALL ADAPT . ACCOUNTING PROCESSOR — — — SYSTEM — — — LEGEND: C1 -MODULAR CORD (D8W-87) - PEC 2725-07G C2 -OCTOPUS CABLE (WP90780) - PEC 2720-05P 355A ADAPTER RS 232 PLUG TO MODULAR JACK - PEC 2750-A24 ...
AT&T 1987 AT&T - page 94

SYSTEM 25 PART OF CABINET OCTOPUS CABLE PART OF ZTN82 SIP OR ZTN128 C2 Z210A C1 355AF C3 Z3A4 C1 CALL PROCESSOR ADAPT. ADAPT. ADU SMDR OUTPUT C4 DEVICE Z3A1 C1 OR CALL OR Z3A4 W1 B1 ACCOUNTING ADU (NOTE) SYSTEM C7 2012D 248B TRANS. ADAPT. LEGEND : B1 - TYPICAL-103A CONNECTION BLOCK* C1 - MODULAR CORD (D8W-87) - PEC 2725-07G C2 - OCTOPUS CABLE (WP90 ...
AT&T 1987 AT&T - page 95

SYSTEM 25 CABINET PART OF ZTN82 OR ZTN128 CALL PROCESSOR (PORT X) TN726 TDM DATA BUS LINE TN726 DATA LINE PART OF OCTOPUS CABLE —— — SIP C2 Z210A C1 355AF Z3A4 . ADAPT. ADAPT. ADU —— — PART OF SIP —— — C2 . C1 Z210A 400B2 ADAPT. ADAPT. —— — C7 2012D 248 b TRANS. ADAPT. PART OF SIP C2 SIP W1 C1 Z3A1/A4 SMDR OUTPUT ADAPT . B1 ...
AT&T 1987 AT&T - page 96

SYSTEM 25 PART OF CABINET OCTOPUS CABLE PART OF —— — ZTN82 SIP —— — OR ZTN128 C2 . > Z21OA CALL ADAPT. CO OR PRIVATE LINE CIRCUIT CONNECT VIA TAE PROCESSOR —— — C1 C3 —— — TYPICAL MODEM TELCO CENTRAL OFFICE 355AF SMDR TYPICA L OUTPU T MODEM DEVIC E LEGEND : C 1 - MODULAR CORD (D8W-87) - PEC 2725-07G C2 - OCTOPUS CABLE (WP ...
AT&T 1987 AT&T - page 97

SYSTEM 25 CABINET ZTN82 OR ZTN128 CALL PROCESSOR TN758 POOLED MODEM —— — TDM TN726 DATA LINE BUS 2012D 248B TN742 ANALOG LINE CO TRUNK FACILITY PART OF OCTOPUS CABLE PART OF —— — SIP C2 Z210A C1 Z3A4 355AF . ADAPT. ADAPT. ADU PART OF SIP —————— — —— — C2 Z210A 400B2 . ADAPT. ADAPT. —— — C7 —————— ? ...
AT&T 1987 AT&T - page 98

CALL COVERAGE—GROUP Description Allows calls to covered stations to be redirected to a group of covering stations. A total of 32 standard Call Coverage Groups may be assigned; for V2 systems, an additional 32 “DGC” call coverage groups maybe assigned. Each standard group may be covered by up to eight call coverage receivers (buttons). There i ...
AT&T 1987 AT&T - page 99

Calls sent to coverage will continue to ring at single-line sender terminals but will cease ringing at multiline sender terminals. In the latter case, the calls will remain on the incoming call appearance button, and that button’s status LED continues to reflect the status of the call. In particular, covered calls to multiline sets remain availab ...
AT&T 1987 AT&T - page 100

Interactions (Standard Group Coverage) ● Attendant Console, Direct Trunk: If the Direct Trunk attendant is a receiver for a Call Coverage Group and extends a call (using the Start button or Selector Console) that is unanswered/busy to a member of the group, the call will return On the Return-On-Don’t-Answer (RTN-DA) or Return-On-Busy (RTN-BUSY) ...
AT&T 1987 AT&T - page 101

Interactions (DGC Group Coverage; V2 Only) ● ● ● ● ● ● ● ● ● ● Attendant Console, Switched Loop: If a SLAC is a member of a DGC-Call Coverage Receiver Group, any DGC—Group Coverage call sent to this attendant will enter the common queue and be treated as a coverage call, not as an Attendant— DGC call. Thus, the call will be ...
AT&T 1987 AT&T - page 102

. Number of rings before call coverage ringing starts on no answer (0-31); Default = 2. The status LEDs on Group Coverage buttons at covering stations begin flashing immediately in all cases. Ringing, in addition to flashing, is always sent on external calls, though it may not be accepted at the covering stations. Voice Terminal: (Station Port) . C ...
AT&T 1987 AT&T - page 103

CALL COVERAGE—INDIVIDUAL Description This feature is very similar to Call Coverage–Group. The primary difference is that this is a one-on-one type coverage. An Individual Cover (COVER IND) button can be assigned on multiline voice terminals to cover calls to a specific (single) voice terminal. The covering station can answer covered calls by pr ...
AT&T 1987 AT&T - page 104

Interactions ● Attendant Console, Direct Trunk: When a coverage call rings at a busy Attendant Console, the attendant receives a single burst of ringing. If the call is still unanswered when the attendant hangs up, the Attendant Console will resume ringing. ● Call Coverage —Group: Unanswered calls to a station, provided both Individual and Gr ...
AT&T 1987 AT&T - page 105

CALL FOLLOWING (FORWARDING) Description Allows users who are away from their phone to receive calls at another phone. The feature is functionally equivalent to Call Forwarding. Users can log in their PDC at another voice terminal and receive their calls at that terminal. I.egging in a PDC at a terminal automatically logs the PDC out at any other te ...
AT&T 1987 AT&T - page 106

Interactions ● Call Coverage: Calls to a logged-in FPDC receive the call coverage of that terminal. [Unanswered calls to a PDC at an away terminal return to the home terminal and receive the home terminal’s call coverage treatment; they do not receive the away terminal’s call coverage. Administration Requirements None Hardware Requirements No ...
AT&T 1987 AT&T - page 107

CALL PARK Description Allows a user to place a call on hold and then pick up the call from any voice terminal in the system. It is used in three typical applications: . Call Park: A user places a call on hold and then picks it up at another voice terminal . Meet-Me-Conference: A conference member places the conference on hold and pages another empl ...
AT&T 1987 AT&T - page 108

A call parked with the Selector Console is retrieved by dialing *8 and the access code assigned to the dedicated Selector Console Call Park button. Each voice terminal user (except the attendant) can only park one call at a time and a maximum of 24 calls can be parked in the system at one time. A call is no longer parked when it is answered, return ...
AT&T 1987 AT&T - page 109

Administration Requirements Attendant Selector Console: ● Assign Call Park buttons. Hardware Requirements None 2-88 ...
AT&T 1987 AT&T - page 110

CALL PICKUP Description Allows a user to answer a call ringing at another voice terminal. There are two forms of Call Pickup; (l) Directed and (2) Group. Directed Call Pickup: Directed Call Pickup allows calls to most other voice terminals, including Automatic Intercom calls and calls ringing at coverage buttons, to be “picked up” by dialing th ...
AT&T 1987 AT&T - page 111

● Personal Line: After a call is picked up from a Personal Line (PERS LINE) button, the called terminal can still enter the call. Administration Requirements Voice Terminal (Station Port): ● Assign Call Pickup Group Number (1-16, None) - Default = None. 2-90 Hardware Requirements None ...
AT&T 1987 AT&T - page 112

CALL PROGRESS TONES Call Progress tones provide audible feedback on the status of calls during call set-up. ● Busy Tone: A slow pulsed tone indicating that all facilities for answering the call are in use. ● Call Waiting (Camp-On) Tone: A single short tone to a busy terminal indicating that another call is waiting (has been “camped on” by t ...
AT&T 1987 AT&T - page 113

CALLING RESTRICTIONS Description Designated voice and data terminals can be restricted from making certain types of calls. Available restrictions are: ● Outward Restriction ● Toll Restriction ● Facility Access Restriction ● ARS Restrictions. Note: Each of these restrictions is voice terminal oriented, not PDC oriented. Outward Restriction: ...
AT&T 1987 AT&T - page 114

ARS Restriction: Special restrictions on each station may be imposed when the call is routed by the ARS feature. Facility Restriction Levels (FRLs) are used to restrict access to trunk groups. An FRL is a single digit (0, 1, 2, 3). A terminal assigned an FRL of 0 has the least privileges, a terminal assigned an FRI. of 3, the most. An FRL is also a ...
AT&T 1987 AT&T - page 115

Automatic Route Selection: ● Route Facility Restriction Levels Trunk Port: ● Allow dial access to this trunk (Yes, No) - Default = Yes System (V2 only): ● Allow dial access to this virtual facility (Yes, No) - Default = No Hardware Requirements None 2-94 ...
AT&T 1987 AT&T - page 116

COMMAND MODE Allows data terminal users to originate data and voice calls and change (or view) their data port options. (Refer also to the general description of the system’s data features in “Data Services Overview”; users who are familiar with Command Mode options should read the “Expert Mode” subsection. ) Command Mode supports digital ...
AT&T 1987 AT&T - page 117

<Options>: If the Command Mode menu item <Options> is chosen, the terminal displays the data port’s administered options. System default values for each option are also shown. The display shown below is similar to what is actually presented on the screen. (See Tables 2-F and 2-G) for additional information on options. ) OPTIONS Speed ...
AT&T 1987 AT&T - page 118

TABLE 2-F. Partial List of Permissible Data Port (TN726) Options OPTION DEFINITION Speed (61-68)† Autobaud, Low *, 300, 1200, 2400, 4800, 9600, 19200 Parity (69) Odd, Even, 0, 1. The 0 and 1 choices are not shown on the user’s display. Enable Command Mode (70) Yes or No. Must be On for Command Mode (i.e., Command Mode Menu display). Not shown o ...
AT&T 1987 AT&T - page 119

TABLE 2-G. Typical Option Profiles for Different Types of Data Port Endpoints Options Speed (highest) Parity Enable Command Mode Permit Mismatch Local Echo Answer Text Connected Indication Disconnect/Recall Sequence Data Term, or PC 19200 (Auto) Even Yes Yes Yes Yes Yes Br-Br Host Computer 9600 * Even Yes No No No No Br-Br Modem Modem (users) (comp ...
AT&T 1987 AT&T - page 120

COMMUNICATIONS ACCESS MANAGER (CAM) (V2) The CAM program facilitates communication between workstations on the AT&T STARLAN NETWORK (STARLAN NETWORK) and workstations on System 25. Detailed procedures for using CAM can be found in the CAM User Guide. The material here provides a brief overview of CAM capabilities. CAM is an MS-DOS application p ...
AT&T 1987 AT&T - page 121

The STARLAN NETWORK communication driver (NAUCOM) is used before CAM is run on a STARLAN NETWORK workstation. The Extended Device driver (CAM232) is used when CAM is run on a PC connected to a System 25 DLC port. The default screen presented when the user accesses CAM is the phone directory screen. The phone screen is divided into five partitions: ...
AT&T 1987 AT&T - page 122

CONFERENCE Description Allows up to five parties, including the conference originator, to participate in a conference call. Any voice terminal user, including operators at Direct Trunk Attendant Consoles and Switched Loop Attendant Consoles (V2), can set up conferences. Refer to the description of “(’conference Drop” for additional informatio ...
AT&T 1987 AT&T - page 123

● Call Park: Call park may be used to place a conference on hold. Parked conference calls do not return to the parking station (they remain parked). If a 5-person conference is parked, the conferee who parked the conference will be dropped when someone picks up the parked conference. ● Exclusion: Exclusion may be invoked before establishing a c ...
AT&T 1987 AT&T - page 124

CONFERENCE DROP Description Allows a voice terminal user, except for the attendant at a Switched Loop Attendant Console (SLAC, V2 only), to selectively drop a previously added party from a conference call. At a SLAC, the attendant can drop conferees only before they have been added to conference. Multiline Voice Terminals (except SLAC): On a multil ...
AT&T 1987 AT&T - page 125

Interactions None Administration Requirements None Hardware Requirements None 2-104 ...
AT&T 1987 AT&T - page 126

DATA CALL SETUP Allows a user to originate data calls from a data terminal. System 25 provides three methods of data calling: ● Dialing from a data terminal, which is described in the “Data Terminal Dialing” feature description. ● Setting up data calls from a voice terminal, which is described in the “Transfer to Data” feature descripti ...
AT&T 1987 AT&T - page 127

DATA SERVICES OVERVIEW System 25’s data features provide switched data transmission at up to 19,200 bps (RS-232 interface ), and a 212A modern compatible conversion resource capable of handling data at 300 and 1200 bps. The system provides switched connections between data endpoints. These endpoints include data terminals, personal computers, mul ...
AT&T 1987 AT&T - page 128

and AB (Signal Ground) to function, while others require more RS-232 control signals to operate. An ADU (Figure 2-19) can send Data Terminal Ready (DTR) from the data terminal to the Data Line circuit and the Data Line circuit can send a control signal to the data terminal. The signals Data Set Ready (DSR), Clear To Send (CTS), and Received Line Si ...
AT&T 1987 AT&T - page 129

Data Terminal Dialing mode, or to enter the Setup mode on calls originating from a voice terminal or on auto-answered calls. In the case of most personal computers, a communications program must be executed in order for it to communicate with its own RS-232 port or built-in modem. Once the communications software is running, further operation will ...
AT&T 1987 AT&T - page 130

Data Endpoint States The data endpoint may take on three states: (l) off-line, (.2) on-line (on-hook), and (3) on-line (off-hook). Off-line is when a data terminal is out of service (turned off, disconnected, etc,). The on-line (on-hook) state occurs when the terminal is turned on, is available to answer a call, but is not on a data call. Finally, ...
AT&T 1987 AT&T - page 131

Setup mode is entered. f. Data Call Setup Mode Data Call Setup Mode is a transitional state entered after Transfer To Data, Data Terminal Dialing, or during auto-answer; it exists during the handshake between data ports. If the endpoints are compatible and handshaking is successful, a data connection is established. If handshake failure occurs, the ...
AT&T 1987 AT&T - page 132

● Flashing–Data endpoint is being alerted of an incoming call ● On Steady–Data endpoint is either in the on-line (off-hook) state or is reserved for another user and busy. Refer to the following feature descriptions for additional information: ● Command Mode ● Data Call Setup ● Data Terminal Dialing ● Expert Mode ● Modem Pooling ? ...
AT&T 1987 AT&T - page 133

DATA TERMINAL DIALING Description When the user makes a data call from a data terminal, voice terminal dialing and call progress tones are replaced by keyboard dialing and call progress messages. The message “DIAL:” prompts the user to enter the called number from the keyboard, and “RINGING” or “DIALING . . . COMPLETED” informs the user ...
AT&T 1987 AT&T - page 134

End-to-End Signaling: Data connections to off-premises destinations require that a conversion resource (pooled modem) be inserted into the connection. Occasionally it is necessary to send additional tones to the remote endpoint after the connection is established to signal the remote equipment. A “mark” character must be included on the DIAL: l ...
AT&T 1987 AT&T - page 135

TABLE 2-H. Call Progress Messages for Data Terminal Dialing Displayed Message Application Meaning DIAL: Placing a call Equivalent to dial tone. Enter any required facility number followed by the dialed number and a RETURN. RINGING Placing a call Equivalent to Ringback Tone. Called number (far-end) is being signaled. Provided on internal calls only. ...
AT&T 1987 AT&T - page 136

Considerations Data Terminal Dialing allows users to place data calls from their terminals using the Data Terminal Dialing feature and allows users to review the options administered for their data ports. Interactions ● End-To-End Signaling: (See above text) ● Modem Pooling: Data calls between analog and digital endpoints require that a convers ...
AT&T 1987 AT&T - page 137

DIAL PLAN The dialing plan for System 25 is based on the concept that, whenever possible, calls should be placed to individuals rather than to voice terminals. To implement this concept, individuals are assigned Personal Dial Codes (PDCs) and are allowed to log in those PDCs at other voice terminals. There are two types of PDCs: assigned and floati ...
AT&T 1987 AT&T - page 138

● #5–Insert dialed digits here (in Virtual Facility numbers; (V2 only) ● #–End of dialing The maximum number of dial codes available for a System 25 is 600. In R1Vl, each assigned code is allocated as a ten number block. In R1V2, each assigned code is stored individually in memory. The dial codes assigned in the system must be completely un ...
AT&T 1987 AT&T - page 139

DICTATION SYSTEM ACCESS Description Permits access to, and control of customer-owned dictation equipment by voice terminal users. Dictation systems may be connected either via single-line voice terminal ports (the preferred method) or via auxiliary trunk ports (if the dictation equipment requires a separate contact closure for proper operation). Th ...
AT&T 1987 AT&T - page 140

SYSTEM 25 —— — CABINET PART OF OCTOPUS PART OF CABLE SIP TN742 —— — C2 W1 C5 DICTATION OR SI P l B1 ADAPT . EQUIPMENT ZTN78 —— — (NOTE) LEGEND : TN742 - ANALOG LINE CP ZTN78 - TIP RING LINE CP B 1 - TYPICAL-103A CONNECTING BLOCK* C 2 - OCTOPUS CABLE (WP90780) PEC 2720-05P C 5 - MODULAR CORD (D4BU-87 ) W1 - 4 PAIR INSIDE WIRING CAB ...
AT&T 1987 AT&T - page 141

DIGITAL TAPE UNIT (DTU) The Digital Tape Unit (Figure 2-21 ) is a RS-232 device used to record administration translations. The DTU does not encode the translations data as it records, nor does it require decoding circuitry when playing back (restoring) recorded data. Data is recorded and transmitted at 1200 bps. The DTU requires 115V commercial po ...
AT&T 1987 AT&T - page 142

SYSTEM 25 PART OF CABINET OCTOPUS CABLE PART OF —— — ZTN82 SIP —— — OR ZTN128 C2 Z210A C1 ● 355A/AF CALL ADAPT. PROCESSOR —— — —— — LEGEND: C1 - MODULAR CORD (D8W-87) - PEC 2725-07G C 2 - OCTOPUS CABLE (WP90780) - PEC 2720-05P 355A ADAPTER RS 232 PLUG TO MODULAR JACK - PEC 2750-A24 355AF ADAPTER RS 232 RECEPTACLE TO MODULA ...
AT&T 1987 AT&T - page 143

DIRECT GROUP CALLING (DGC) Description Al l O w S incoming calls to be directed to a specific group of terminals. Up to 32 DGC groups, each including up to 10 members, may be set up. A terminal can be in only one DGC group. Incoming calls on any trunk can be directed to a DGC group. These trunks can also be used for outgoing calls. This feature is ...
AT&T 1987 AT&T - page 144

Considerations DGC groups are particularly useful when the answering group receives a high volume of calls. Call completion time is minimized and attendant assistance is not required. Any number of outside trunks may be administered to feed into a DGC group. A trunk may feed only one DGC group. Interactions ● Attendant Camp-On: For V1 systems onl ...
AT&T 1987 AT&T - page 145

● Transfer: For V2 systems only: internal stations can transfer outside (trunk) calls to a busy DGC group. The transferred call will be treated as any other trunk call to a busy DGC group. Administration Requirements ● Trunks - Assign trunks to DGC Group ● Trunks (V2) - Assign trunks to ring in SLAC queue ● System: Number of rings before DG ...
AT&T 1987 AT&T - page 146

DIRECT GROUP CALLING DELAY ANNOUNCEMENT Description Provides a recorded announcement to an outside (trunk) caller who has been placed in queue for a DGC Group. When all members in the group are busy (off-hook), the call will be queued for DGC service and the calling party will receive ringback tone. Note that no incoming call indication (ringing) i ...
AT&T 1987 AT&T - page 147

SYSTEM 25 CABINET PART OF OCTOPUS PART OF CABLE SIP TN742 —— — C2 SIP W1 C5 DELAY OR ● ADAPT . B1 ANNOUNCEMENT ZTN78 —— — EQUIPMENT —— — LEGEND: TN742 - ANALOG LINE CP ZTN78 - TIP RING CP B 1 - TYPICAL-103A CONNECTING BLOCK* C 2 - OCTOPUS CABLE (WP90780) PEC 2720-05P C 5 - MODULAR CORD (D4BU-87) W1 - 4 PAIR INSIDE WIRING CABLE* ...
AT&T 1987 AT&T - page 148

Description Allows incoming calls to reach specific individuals or facilities in the system without attendant assistance. System 25 customers reserve blocks of DID numbers from the CO. The DID numbers may correspond to a PDC FPDC, DGC access code, DDC, or any facility with an access code such, DIRECT INWARD DIALING (DID) as a pooled facility or a p ...
AT&T 1987 AT&T - page 149

sender will flash and will then go dark when the call is answered. However, if the call is placed directly to the attendant position or is forwarded to the position and thereby arrives on a System Access button or a Loop button (e.g., if a DID PDC is logged-in at the attendant position), then no LED indications on the Selector Console will be provi ...
AT&T 1987 AT&T - page 150

Hardware Requirements: Each DID trunk requires a port on a TN753 DID Trunks CP. 2-129 ...
AT&T 1987 AT&T - page 151

DIRECT STATION SELECTION (DSS) Description Allows one-button access to another voice terminal, a paging zone, or a DGC Group. This feature requires a button assignment on a multiline voice terminal. There are two types of DSS buttons. Numbers stored on DSS buttons (maximum of four digits) are programmed at the SAT; numbers stored on Flexible DSS bu ...
AT&T 1987 AT&T - page 152

● Line Selection (Prime Line Preference): When Prime Line Preference is assigned to a DSS button, the button must be pressed to invoke the busy-to-idle reminder, even though its red I-Use LED is lighted. ● Personal Dial Code (PDC): An attempt to program a FPDC on a FLEX DSS button (rather than a PDC) results in Reorder Tone. ● Pooled Faciliti ...
AT&T 1987 AT&T - page 153

DISTINCTIVE RINGING Description Allows users to distinguish between different types of incoming calls. Users can receive the following types of ringing: ● A repeated two-burst tone indicates an outside call or a call extended by the attendant. The two-burst tone pattern is: 0.4 seconds on, 0.2 seconds off, 0.6 seconds on, and 4.0 seconds off. ● ...
AT&T 1987 AT&T - page 154

END-TO-END SIGNALING Description Allows multiline voice terminals to send touch-tone (DTMF) signals over the DDD network and allows single-line and multiline users to send touch-tones over dial pulse trunks. The 7300H series voice terminals do not generate touch-tones when a dial pad button is pressed. The End-To-End Signaling feature provides for ...
AT&T 1987 AT&T - page 155

EXCLUSION Description Allows multiline voice terminal users to keep other users with appearances of the same Personal Line from listening in on their calls. Exclusion allows users to exclude the attendant and other stations from an existing or held outside call, or to drop other System 25 users from a call. The Exclusion button status and I-use LED ...
AT&T 1987 AT&T - page 156

EXPERT MODE (V2) Description Expert Mode is an enhancement to the Command Mode feature that provides an alternative method of performing the full range of Command Mode functions. By eliminating the display of menus and allowing multiple commands to be entered on a single line, Expert Mode lends itself to computer-driven instructions. Individual use ...
AT&T 1987 AT&T - page 157

If the user enters “D” and then a RETURN, the system will prompt for the data endpoint number as follows: Command: D DIAL: The user must then enter the digits required to complete the call. Activating the Third-Party Call Setup Feature The following provides an abbreviated method of using the Third-Party Call Setup feature while in the Expert M ...
AT&T 1987 AT&T - page 158

Command: PE Change Parity to Even Command: MY Change Mismatch to Yes If the user enters an invalid Option or setting, the system responds with INVALI D OPTION and the entry is ignored. Once all changes have been entered, the user enters XE to enable the options. Considerations Expert Mode is primarily for use by computer-driven endpoints that can s ...
AT&T 1987 AT&T - page 159

EXTENDED STATIONS Description Allows single-line voice terminals to be located at distances greater than 2000 feet from the system cabinets. Extended stations have the same feature capabilities other voice terminals. These stations count as an outside party on conference calls. Transmit and receive levels are increased at extended stations for conf ...
AT&T 1987 AT&T - page 160

EXTERNAL ALERTS Description Provides standard station ringing at a location away from the called station. This feature can be used to activate an external alerting device such as a bell. External Alerts supports the Trunk-Answer-from-Any-Station (TAAS) form of Night Service. The feature can be used in conjunction with voice terminals located in noi ...
AT&T 1987 AT&T - page 161

Order the Supplemental Alert Adapter (PEC 2301-SAA) for controlling a remote alerting device. A Supplemental Alert Adapter is installed in the line between the port CP and the user’s MERLIN terminal. The line requires a ZTN79 ATL Line CP. Figure 2-25 contains connection details. Descriptions of the SIP (Station Interconnect Panel), TAE (Trunk Acc ...
AT&T 1987 AT&T - page 162

SYSTEM 25 PART OF CABINET OCTOPUS CABLE PART OF —— — SIP ZTN79 —— — C2 SIP W1 C1 ATL ● ADAPT . B1 LINE CP —— — TERMINAL T1 —— — LEGEND : A1 - SUPPLEMENTAL ALERT ADAPTER (2301-SAA) B 1 - TYPICAL – 103A CONNECTING BLOCK C 1 - MODULAR CORD (D8W-87) C 2 - OCTOPUS CABLE (WP90780) C8 - MODULAR CORD (D4BU-87) S1 - EXTERNAL ALER ...
AT&T 1987 AT&T - page 163

HANDS-FREE ANSWER ON INTERCOM (HFAI) Description Allows the following voice terminals to provide hands-free answer service on eligible incoming calls; each terminal must have Automatic Answer (AUTO ANS) assigned to a flexible button. ● BIS (7305H03B and 7305H04C) and HFAI (7309H01A); these sets provide full service without requiring adjuncts. ● ...
AT&T 1987 AT&T - page 164

— During the call, the called party can press the HFAI/Mic or MICROPHONE button to mute the microphone temporarily and prevent the caller from hearing. Pressing the button again turns the microphone on again. — The HFAI/BIS user may pres s the SPEAKER (HFAI set) or th e SPEAKERPHONE (BIS set) button to end the call. For V2 systems only: if the ...
AT&T 1987 AT&T - page 165

Interactions ● Attendant (V1 Only): The attendant may pass calls to HFAI sets using the Transfer feature and button rather than extending these calls using the START button or the Selector Console. Such calls are then eligible for HFAI service. However, since unanswered transferred calls do not return to the attendant for further service (as exte ...
AT&T 1987 AT&T - page 166

HEADSET ADAPTER ADJUNCT Description The headset adapter adjunct provides an interface for connecting a headset to an associated voice terminal. A headset plugged into the adapter is activated by switches on the adapter. The terminal operator has the choice of using either the handset or the headset for handling calls. Turning the headset on and off ...
AT&T 1987 AT&T - page 167

● Figure 2-28 -Typical Headset Adapter Connections for 34-Button Deluxe, BIS, or BIS with Display Voice Terminals ● Figure 2-29 -Typical Headset Adapter Connections for 12-Button MET Sets MET Headset Adapter: Use of a headset with a 10-Button MET voice terminal requires a JS0180-3A Headset Adapter (18 inch cord) or a JS0180-4A Headset Adapter ( ...
AT&T 1987 AT&T - page 168

SYSTEM 25 CABINET ZTN79 HYBRID LINE CP PART OF OCTOPUS CABLE —— — PART OF SIP C2 SIP W1 C1 VOICE ● ADAPT B1 TERMINAL T1 , —— — C8 —— — —— — 502A HEADSET ADAPTER - PEC 3164-HFA LEGEND: B 1 - TYPICAL-103A CONNECTING BLOCK* C 1 - MODULAR CORD (D8W-87) - FURNISHED WITH SET C 2 - OCTOPUS CABLE CABLE (WP90780) - PEC 2720-05P C 8 ...
AT&T 1987 AT&T - page 169

SYSTEM 25 CABINET PART OF ZTN79 HYBRID OCTOPUS CABLE —— — PART OF SIP LINE CP C2 SIP W1 B1 C1 VOICE ● ADAPT TERMINAL T1 —— — I —— — —— — C7 PWR SUPPLY P1 C8 502A HEADSET ADAPTER - PEC 3164 - HFA LEGEND : B1 - TYPICAL-103A CONNECTING BLOCK* C 1 - MODULAR CORD (D8W-87) - FURNISHED WITH SET C2 - OCTOPUS CABLE CABLE (WP90780) ...
AT&T 1987 AT&T - page 170

SYSTEM 25 CABINET TN735 MET LINE CP PART OF OCTOPUS CABLE PART OF SIP —— — —— — ● ● —— — C2 SIP W1 400B2 C1 MET SET B1 ADAPT ADAPT T1 C7 —— — LEGEND: —— — 248B —— — ADAPT 2012D TRANS B 1 - TYPICAL-103A CONNECTING BLOCK* C1 - MODULAR CORD (D8W-87) - FURNISHED WITH SET C2 - OCTOPUS CABLE (WP90780) PEC 2720-05P ...
AT&T 1987 AT&T - page 171

HOLD Description Allows users to temporarily disconnect from one call and either place or answer another call. A single-line voice terminal user can place only one call on hold and must remain off-hook to retain the held call. A multiline voice terminal user can place as many calls on hold as it has lines and can hang up without losing held calls. ...
AT&T 1987 AT&T - page 172

INTERCEPT TREATMENT WITH REORDER TONES Description Reorder tone (fast busy) is provided when an unassigned or toll-restricted number is dialed, a dialing error occurs, or an attempt to park a call fails. Any attempt to dial an unassigned code (PDC, DDC, feature or facility access code) or an unsuccessful attempt to park a call will result in Reorde ...
AT&T 1987 AT&T - page 173

INTERDIGIT TIMEOUTS Description Allows an originating register to be made available for others if dialing is not completed within a set time period. Interdigit timeouts is 24 seconds until the first five digits have been dialed, 10 seconds until the next five digits have been dialed, and five seconds thereafter. After timeout, voice terminal dial p ...
AT&T 1987 AT&T - page 174

LAST NUMBER DIALED (V2) Description Automatically saves the last number dialed from a multiline voice terminal and allows the user to place the call again without redialing the number. The feature is administered to a button on the terminal. Both inside and outside calls can be made in this way. The original call can be placed by manual dialing, by ...
AT&T 1987 AT&T - page 175

● Call Accountability: When a station user dials ##PDC to provide accountability for a call and then dials the desired digits, the ##PDC is not saved by the Last Number Dialed feature. ● Conference: When a station user adds a party to a conference, the number dialed is saved as the Last Number Dialed. ● Direct Station Selection (DSS): Numbers ...
AT&T 1987 AT&T - page 176

LINE SELECTION Description Multiline voice terminals may have many line (facility) appearances. There are three methods by which a user may select a desired line: (1) Prime Line Preference, (2) Ringing Line Preference, and (3) Preelection. Prime Line Preference: Automatically connects a multiline voice terminal to a specified line or facility desig ...
AT&T 1987 AT&T - page 177

Preselection: Allows multiline voice terminal users to override the above line preference features. Users may simply press a desired line access button before going off-hook. The user will be connected to the facility selected unless the facility is busy and the party using it has invoked Exclusion or is part of a conference call that is at maximum ...
AT&T 1987 AT&T - page 178

LINE STATUS AND l-USE INDICATIONS Description Provides users with a visual indication of the status of feature buttons and lines appearing at a their multiline terminals. A green status LED and a red I-Use LED are provided for each programmable button on most multiline voice terminals. Table 2-I summarizes LED states and associated descriptions for ...
AT&T 1987 AT&T - page 179

Administration Requirements None Hardware Requirements None 2-158 ...
AT&T 1987 AT&T - page 180

MANUAL SIGNALING Description Allows a user to signal another voice terminal. The user may do this at any time, whether on-hook or off-hook. Multiline voice terminal users can signal another predesignated multiline voice terminal by pressing an associated Manual Signaling (SIGNAL) button. A single tone burst is provided at the signaled terminal. The ...
AT&T 1987 AT&T - page 181

MESSAGE CENTER-LIKE OPERATION (V2; SLAC Only) Description A System 25 Switched Loop Attendant Console (SLAC) can be made to function like a message center through administration of call type translations. Certain specific types of calls in the common queue will then be directed only to a console administered as a message center. This arrangement in ...
AT&T 1987 AT&T - page 182

operator for the entire system. A call extended by either Attendant to a station that does not answer or is busy returns to the Message Center. Two combined Attendant Position/Message Centers; the Attendants at each combined position also function as Message Center operators. The special call types answered by Message Centers can be divided between ...
AT&T 1987 AT&T - page 183

MESSAGING SERVICES Description Lights an LED to indicate that another station (or the attendant) has a message for the user. The Messaging Services provide light activation/deactivation only. Users must call the sender to receive their messages. The system supports three types of Message Waiting service: ● Attendant Message Waiting ● Call Cover ...
AT&T 1987 AT&T - page 184

Station-To-Station Message Waiting: Multiline voice terminals can be assigned (paired) Message Waiting (MSG WAIT) buttons with associated status LEDs. When this indicator is lighted, the user calls the other user for messages. The MSG WAIT LED can be controlled by the two associated terminals only ; either user can toggle the state of both LEDs (e. ...
AT&T 1987 AT&T - page 185

MODEM POOLING Description Allows switched data connections between digital data endpoints and analog data endpoints. (Refer also to the description of the system’s data features provided in the “Data Services Overview’’ subsection.) Data transmission between digital and analog endpoints requires a conversion resource since the digital forma ...
AT&T 1987 AT&T - page 186

● On-Premises Data Calls: To establish a data connection between an on-premises analog data endpoint and an on-premises digital endpoint. ● Outgoing Trunk Calls: To establish a data connection between an off-premises analog endpoint (modem) and an on-premises digital endpoint. Considerations Modem Pooling provides a pool of conversion resources ...
AT&T 1987 AT&T - page 187

Hardware Requirements One TN758 Pooled Modem CP provides two conversion resources. Two TN758s are allowed per system cabinet, for a total of 12 conversion resources in a 3-cabinet system. 2-166 ...
AT&T 1987 AT&T - page 188

MUSIC-ON-HOLD Description Provides rnusic or other audible indication to a held party on an outside line. On an outside call, if the user places the call on Hold, or after a call into a DGC group receives the delay announcement, music is provided to the calling party. Music-On-Hold is not invoked when a conference call is placed on hold or when the ...
AT&T 1987 AT&T - page 189

Hardware Requirements A music source is needed to support the Music-On-Hold feature. The interface is a port on a ZTN78 Tip Ring Line CP or TN742 Analog Line CP. Detailed connection information is provided in the following figures: ● Figure 2-30—Music-On-Hold Equipment Connections (FCC Registered) ● Figure 2-31—Music-On-Hold Equipment Conne ...
AT&T 1987 AT&T - page 190

SYSTEM 25 CABINET PART OF OCTOPUS CABLE TN742 PART OF SIP OR C2 SIP W1 MOH ADAPT. UNIT ZTN78 W1 368 VOICE W1 C6 MUSI C COUPLER B1 SOURC E W1 2012D TRANSFORMER LEGEND : TN742 - ANALOG LINE CP ZTN78 - TIP RING CP B 1 - TYPICAL-103A CONNECTING BLOCK* C2 - OCTOPUS CABLE (WP90780) PEC 2720-05P C6 - SINGLE-ENDED MODULAR CORD, D4BY W 1 - 4 PAIR INSIDE WIR ...
AT&T 1987 AT&T - page 191

NIGHT SERVICE Description Allows users to answer incoming calls on specified trunks when the attendant is not on duty. There are two types of Night Service (NS): ● Directed NS: Redirects incoming calls on specified trunks to designated voice terminals. ● Trunk-Answer-from-Any -Station (TAAS) NS: Allows users to answer incoming calls on specifie ...
AT&T 1987 AT&T - page 192

Trunk-Answer-from-Any-Station: Allows any user to answer NS calls. Incoming trunk calls activate an external alerting device such as a bell (“External Alerts” feature). A user can then dial the NS access code and answer the call. Night Service is activated under the following conditions: ● An attendant has pressed NIGHT on either console. ● ...
AT&T 1987 AT&T - page 193

● Assign Night Service Access Code. Hardware Requirements TAAS NS requires an associated external alert (such as a bell). Each alert requires a port on a ZTN78 Tip Ring Line or a TN742 Analog Line CP. Refer to the “External Alerts” subsection for detailed information and a connection diagram. 2-172 ...
AT&T 1987 AT&T - page 194

NIGHT SERVICE DELAY ANNOUNCEMENTS Description Provides a recorded announcement for incoming trunk calls when the system has Directed Night Service (NS) activated and a call is not answered. Directed NS calls not answered within a specified number of rings (1-15) may be directed to a recorded announcement. Two different recorded announcements may be ...
AT&T 1987 AT&T - page 195

SYSTEM 25 CABINET PART OF OCTOPUS PART OF CABLE SIP TN742 —— — C2 SIP W1 C5 DELAY OR ● ADAPT. B1 ANNOUNCEMENT ZTN78 EQUIPMENT —— — —— — LEGEND : TN742 - ANALOG LINE CP ZTN78 - TIP RING CP B 1 - TYPICAL-103A CONNECTING BLOCK* C2 - OCTOPUS CABLE (WP90780) PEC 2720-05P C5 - MODULAR CORD (D4BU-87) W 1 - 4 PAIR INSIDE WIRING CABLE* * ...
AT&T 1987 AT&T - page 196

OFF-PREMISES STATIONS (OPS) Description An OPS is a single-line voice terminal that is located in another building and connected to System 25 via arrangements with the local CO. The station has the same features as an on- premises single-line station except that it is counted as an outside party in a conference call. Also, the Message feature will ...
AT&T 1987 AT&T - page 197

OUT-OF-BUILDING STATIONS Description Single-line voice terminals and multiline 7300H series terminals may be directly connected to the system even though they are not located in the same building. For 7300H series terminals special In-Range Out of Building (IROB) units are used to protect the switch and its users from lightning, power crosses, etc. ...
AT&T 1987 AT&T - page 198

PAGING SYSTEM ACCESS Description Provides users with dial access or feature button access to paging equipment. As many as three paging zones can be provided, each with its own access code. (A zone is the location of paging loudspeakers, for example, conference rooms, warehouses, or storerooms.) In addition, one access code can be provided to activa ...
AT&T 1987 AT&T - page 199

Interactions ● Direct Inward Dialing: A DID call may access a paging code. This allows the user to dial in and utilize the Paging System Access feature. Dial restricting the paging code will block this interaction. Administration Requirements Special Feature Ports (Auxiliary Trunk Interface): ● Assign Paging access code for each paging zone (ma ...
AT&T 1987 AT&T - page 200

SYSTEM 25 CABINET I PART OF TAE 700A NETWORK INTERFACE BLOCK (110- OR 66-TYPE CONNECTING BLOCK) W1 B ZTN76 W1 † PAGING OR C5 B1 ZTN77 SYSTEM LEGEND : ZTN7 6 - CO GROUND START TRUNK CP ZTN7 7 - CO LOOP START TRUNK CP B - 3 TO 1 SPLITTER CABLE-CONNECTORIZED (OR6016) PEC 2720-06X B1 - TYPICAL-103A CONNECTING BLOCK* C 5 - MODULAR CORD (D4BU-87) W1 - ...
AT&T 1987 AT&T - page 201

SYSTEM 25 CABINET 25 PAIR DE CABLE PART OF 66-BLOCK A ❘❘❘❘ ❘ ❘❘❘❘ ❘ W1 278A W1 PAGING OR TN763 C5 ADAPTER B1 DICTATION SYSTEM LEGEND : -V GRO D-181321 ZENER KIT C6 48V DC P1 GRD -48V DC * Figure 2-34. TN76 3 - AUXILIARY TRUNK CP I A - SINGLE-ENDED 25 PAIR CONNECTOR CABLE (A25D) (NOTE 1) B1 - TYPICAL - 103A CONNECTING BLOCK* C5 - ...
AT&T 1987 AT&T - page 202

PERSONAL DIAL CODE (PDC) Description Each station is assigned a PDC. The user may log in the PDC at any other voice terminal, and calls to the PDC will follow the user. A PDC can be assigned to a convenience voice terminal (i.e., not associated with a particular user) and to data terminals with modems. Digital data endpoints are assigned Data Dial ...
AT&T 1987 AT&T - page 203

A call unanswered at the away terminal will be directed back to the home terminal unless one of the following busy conditions exists at the home terminal: (1) it is a multiline terminal with both System Access buttons busy and with no idle call coverage receiver or (2) it is a single-line voice terminal that is off-hook, has no idle Call Coverage r ...
AT&T 1987 AT&T - page 204

Interactions ● Call Coverage: Calls to a logged-in FPDC receive the call coverage of that terminal. lJnanswered calls to a PDC at an away terminal return to the home terminal and receive the home terminal’s call coverage treatment; they do not receive the away terminal’s call coverage. ● Direct Inward Dialing: In systems with DID service, P ...
AT&T 1987 AT&T - page 205

PERSONAL LINES Description Provides a dedicated outside line for multiline voice terminal users. Unlike pooled facilities, which can be accessed via dial codes, Personal Lines can be accessed only via a dedicated feature button, and provide both incoming and outgoing service. Up to 16 terminals may share a Personal Line (up to 8 in R1V1). Up to fou ...
AT&T 1987 AT&T - page 206

● Line Selection (Prime Line Preference): Prime Line Preference may b e assigned to a Personal Line. ● Pooled Facility: A Personal Line may also be a member of a pooled facility group. ● Toll Restriction (see “Calling Restrictions”): A call over a Personal Line is subject to the toll restrictions of the station on which the call was place ...
AT&T 1987 AT&T - page 207

POOLED FACILITY - DIAL ACCESS Description Allows both multiline and single-line voice terminal users to access a common pool of trunks by dialing a facility access code. Up to 16 facility access codes can be assigned (one per trunk group). The codes can be one to four digits in length. A group of similar trunks assigned the same access code is refe ...
AT&T 1987 AT&T - page 208

POOLED FACILITY - DIRECT ACCESS Description Allows multiline voice terminal users to access a common pool of trunks via a Direct Facility Access (FACILITY) button. Upon pressing a FACILITY button and going off-hook, a multiline voice terminal user is connected to a common pool of outside trunks (i.e., CO, FX, WATS, tie). If the Status and I- Use LE ...
AT&T 1987 AT&T - page 209

Administration Requirements Voice Terminal (Station Port): ● Assign Direct Facility Access (FACILITY) buttons. Trunks: ● Assign Facility Access Codes. Hardware Requirements None 2-188 ...
AT&T 1987 AT&T - page 210

POWER FAILURE TRANSFER (PFT) Description Provides service to and from the CO for a limited number of prearranged single-line voic e terminals during a commercial power failure (or when voltage drops below 90 volts for longer than 250 milliseconds) and during other service interruptions. Any loop start or ground start trunk may be arranged to termin ...
AT&T 1987 AT&T - page 211

trunks. If Ground Start trunks are used, a 55A1 Ground Start Button must be provided at each PFT set. Only FCC registered single-line voice terminals may be used for PFT stations. Rotary sets must be used for dial pulse PFT trunks; touch-tone sets must be used for touch-tone PFT trunks. In the event of a Power Failure Transfer (switch has lost powe ...
AT&T 1987 AT&T - page 212

(TRUNK) AT&T 10B EMERGENCY TRANSFER UNIT SWITCH ADDITIONAL (CPU) ETU FOR PROPER OPERATION THIS UNIT MUST BE GROUNDED Figure 2-35. 10B Emergency Transfer Unit (ETU) 2-191 ...
AT&T 1987 AT&T - page 213

SYSTEM 25 CABINET TRUNK 25-PAIR TAE CENTRAL ———————— — PORT OFFICE CALL -48V PROCESSOR TO ADDITIONAL ETUs ETU ETU TO SWITCH ETU TO (TRUNK) CO ❑ CPU ADDITIONAL ❑ ETU ETU TO SWITCH ETU TO 25-PAIR OCTOPUS STATION TAE CENTRAL OFFICE (LINE) 25-PAIR CABLE ———————— — PORT PART OF SIP 858A ADAPT. UP TO FIVE POWER FAI ...
AT&T 1987 AT&T - page 214

700A NETWORK INTERFACE BLOCK DIGITAL SWITCH (66-, OR 11O-TYPE) CO TRUNK CP CO TRUNK CP CO NETWORK ACCESS CO TRUNKS RJ2x1 TRUNK CP CO TRUNK CP CO TRUNK CP CENTRAL OFFICE C 2 CO ANALOG STATION CP C1 PART OF OCTOPUS CABLE —— — CPU ETU (3) —— — —— — CALL PROCESSOR GROUND TRUNK CP ● LEG 7 ● PART OF SIP TO SINGLE -48V DC POINT GROUN ...
AT&T 1987 AT&T - page 215

PROGRAM Description Enables system users to store numbers for access by feature buttons or code dialing. Multiline voice terminal users can program numbers on REP DIAL and FLEX DSS buttons. Both multiline and single-line terminal users can store Personal Speed Dialing numbers. FLEX DSS buttons provide access to inside extension numbers only; REP DI ...
AT&T 1987 AT&T - page 216

Special Characters (V2) The following special characters may be used in Repertory Dialing and Personal Speed Dialing numbers on R1V2 systems only: CHAR. USED IN REPERTORY DIALING NUMBERS * Produces a 1.5 second pause. (Since System 25 does not have a Dial Tone detector, judicious use of the pause character will help to ensure that intermediate Dial ...
AT&T 1987 AT&T - page 217

Programming Procedures Program mode may be entered either by dialing a code (#4) or by moving the Test/Program switch to P (on voice terminals so equipped). If the code is used to enter program mode, the terminal remains in program mode until the user goes on-hook or a timeout occurs. If the switch is used to enter program mode, the terminal remain ...
AT&T 1987 AT&T - page 218

Considerations The Progra m feature allows users to assign their own Personal Speed Dial/Flex DSS/Repertory Dial numbers. This is particularly useful where working arrangements or personnel responsibilities change. Interactions ● Users cannot place or answer calls while in the program mode. Incoming calls will receive Busy Tone. ● Should a numb ...
AT&T 1987 AT&T - page 219

RECALL Description Single-line voice terminal users can obtain System 25 Recall Dial Tone by pressing the RECALL button (not all single-line sets have a RECALL button). Pressing RECALL is equivalent to briefly pressing and releasing the switchhook (switchhook flash). The RECALL button on a multiline voice terminal can be used, under specialized con ...
AT&T 1987 AT&T - page 220

REMOTE ADMINISTRATION INTERFACE Description Provides dial-up access to the system’s administration port, either for a standard system administration terminal or for a PC running Advanced Administration software. Both read and write capability is provided with access to all system translation and fault tables. A remote administration terminal can ...
AT&T 1987 AT&T - page 221

REPERTORY DIALING Description Allows multiline voice terminal users to store a telephone number, account code, or feature access code in the system’s memory and associate that number with a REP DIAL button. Pressing REP DIAL is equivalent to dialing the stored number. Individual numbers can be up to 28 digits in length. Programming the number is ...
AT&T 1987 AT&T - page 222

Administration Requirements Voice Terminal (Station Port): ● Assign Repertory Dial (REP DIAL) buttons. Hardware Requirements None 2-201 ...
AT&T 1987 AT&T - page 223

SEND ALL CALLS (V1) Description Allows multiline voice terminal users whose calls are covered to temporarily direct some incoming calls to coverage and turn off their ringers to these calls. This feature is activated by pressing the SEND ALL CALLS button. It is deactivated by pressing the button a second time. Considerations Send All Calls is a rel ...
AT&T 1987 AT&T - page 224

A covered station with Send All Calls activated will ring when called by its individual coverage station if there is only one coverage receiver for this station. ● Distinctive Ringing: Normal audible ringing is turned off for most incoming calls when Send All Calls is activated, unless single-ring reminder is administered. ● Line Status Indicat ...
AT&T 1987 AT&T - page 225

SEND ALL CALLS (V2) Description Allows multiline voice terminal users to turn off their ringers and invoke a “do not disturb” condition toward incoming calls. In addition, users who have coverage will have those calls directed immediately to coverage, without the normal system ringing delay. Send All Calls also allow-s covering users to tempora ...
AT&T 1987 AT&T - page 226

If a station is translated to not send ringing to coverage when calls to this station are unanswered, the Send All Calls feature overrides this instruction (ringing will b e sent). If a covering station activates Send All Calls, the station is removed from the coverage path completely. Coverage calls will not be directed to the station. ● Call Co ...
AT&T 1987 AT&T - page 227

SPEAKER Description Allows 7300 H-series voice terminal users to turn On a built-in speaker. The speaker allows on-hook dialing, group listening, and monitoring of call progress signals. The speaker is turned on by pressing SPEAKER. Pressing the button at an idle terminal has the same effect as lifting the handset: the user is connected to the sele ...
AT&T 1987 AT&T - page 228

SPEAKERPHONE ADJUNCT Description The speakerphone adjunct permits users of voice terminals not equipped with built-in speakerphones to place and receive calls without lifting their handsets. The adjunct has an On/Off switch, a switch to temporarily mute the microphone, status lamps, and a volume control (for incoming voice only). All voice terminal ...
AT&T 1987 AT&T - page 229

The S101A Speakerphone must be powered locally with a 2012D Transformer that plugs into a 115V ac receptacle. Adjunct power supplies are described in Section 4, “Hardware Description.” The S102A Speakerphone does not require supplemental power, except when used with a 34-Button Deluxe voice terminal. Detailed speakerphone adjunct connection inf ...
AT&T 1987 AT&T - page 230

SYSTEM 25 CABINET ZTN79 HYBRID LINE CP PART OF OCTOPUS CABLE —— — PART OF SIP C2 SIP W1 C1 VOICE ● ADAPT B1 TERMINAL T1 —— — —— — —— — LEGEND : B1 - TYPICAL-103A CONNECTING BLOCK * C1 - MODULAR CORD (D8W-87) - FURNISHED WITH SET C 2 - OCTOPUS CABLE CABLE (WP90780) - PEC 2720-05 P C8 - SPECIAL CORD - FURNISHED WITH ADJUNC T ...
AT&T 1987 AT&T - page 231

SYSTEM 25 CABINET ZTN79 HYBRID LINE CP PART OF OCTOPUS CABLE PART OF SIP ——— — VOICE Z400F C2 C1 SIP TERMINAL ● ADAPT B1 ADAPT T1 ——— — C7 C8 ——— — PWR S102A ——— — SUPPLY SPEAKERPHONE P1 PEC 3163-HFU LEGEND : B1 - TYPICAL-103A CONNECTING BLOCK* C1 - MODULAR CORD (D8W-87) - FURNISHED WITH SET C2 - OCTOPUS CABLE CABL ...
AT&T 1987 AT&T - page 232

SYSTEM 25 CABINET PART OF OCTOPUS CABLE —— — TN73 5 —— — PART OF SIP ● MET C2 ● SI P 400B2 W1 B1 C1 MET SET LINE CP ADAPT ADAPT T1 —— — C7 C8 —— — —— — 248 B —— — ADAPT 2012D TRANS LEGEND: B1 - TYPICAL-103A CONNECTING BLOCK* C1 - MODULAR CORD (D8W-87) - FURNISHED WITH SET C2 - OCTOPUS CABLE (WP90780) PEC 2720 ...
AT&T 1987 AT&T - page 233

SPEED DIALING Description There are two Dialing. System Speed types of Speed Dialing: (1) System Speed Dialing, and (2) Personal Speed Dialing: Allows the System Administrator to store up to 90 numbers (maximum of 28 characters in length) that are accessible by dialing 3-digit codes from any voice or data terminal. Examples of typical System Speed ...
AT&T 1987 AT&T - page 234

were dialed directly. This includes analysis of the number for the various types of restriction. This feature can also be used when entering account codes. After pressing ACCT ENTRY or flashing the switchhook and dialing “*O”, the user can enter a System Speed Dialing code. The stored number associated with the code (the account code) will be l ...
AT&T 1987 AT&T - page 235

● Personal Lines: The Speed Dialing feature is not accessible from Personal Lines. ● Repertory Dialing: Storing a System Speed Dialing code (#100 -#189) on a REP DIAL button saves memory space, compared to storing the whole number again on the REP DIAL button. ● Speed Dialing: A Personal Speed Dialing number can include a System Speed Dialing ...
AT&T 1987 AT&T - page 236

STARLAN NETWORK ACCESS (V2) Description The AT&T STARLAN NETWORK (STARLAN NETWORK) Access feature provides connectivity between System 25 and a colocated STARLAN NETWORK. This connectivity is provided by a combination of hardware and software elements. The STARLAN INTERFACE circuit pack (ZTN84) is the principal hardware element connecting Syste ...
AT&T 1987 AT&T - page 237

● Communications Access Manager (CAM) CAM is an MS-DOS applications program that provides an enhanced calling interface and terminal emulation for PCs connected to System 25 or a STARLAN NETWORK. This connection must be through a DLC or a STARLAN NETWORK that is, in turn, connected to System 25 by a STARLAN CP. Refer to the Communications Access ...
AT&T 1987 AT&T - page 238

The STARLAN NETWORK View of System 25 From the STARLAN NETWORK, the STARLAN CP functions like a STARLAN NETWORK workstation equipped with a Network Access Unit (NAU). The NAU enables STARLAN NETWORK workstations and servers to access and exchange data over the network. Plug number 1 of the STARLAN CP octopus cable should be connected to an “IN” ...
AT&T 1987 AT&T - page 239

Calls from STARLAN NETWORK to System 25 A STARLAN NETWORK workstation accesses a host computer connected to System 25 (either a local host or a remote host that can be reached using the Modem Pooling feature). 1. The STARLAN NETWORK workstation loads CLIENT and NAUCOM and then CAM software (discussed in the Communications Access Manager Program fea ...
AT&T 1987 AT&T - page 240

PART OF SI P C2 I ZTN78 I I TN742 I W1 I I B1 I I A1 A2 ❘ ZTN84 ❘ 250 0 C5 SINGLE- SYSTEM 25 C2 LINE PHONE (LEG 1 ONLY ) NEU (STARLAN HUB) IN STARLAN WORKSTATION IN C1 NAU - NEU - ZTN84 - ZTN78 - TN742 - A1 - A2 - B1 - C1 - C2 - C5 - W1 - NOTE 1: PC PHONE OUT IN NAU NETWORK ACCESS UNIT - PEC 2614-100 NETWORK EXTENSION UNIT - PEC 2610-001 STARLA ...
AT&T 1987 AT&T - page 241

PART OF SIP ZTN79 ❘ C2 W1 B1 A 1 A2 ZTN84 SYSTEM 25 ATL PHONE C1 C2 (LEG 1 ONLY) C4 T1 A3 IN NEU I N C1 NAU - NEU - ZTN79 - ZTN84 - A1 - A2 - A3 - B1 - C1 - C2 - C3 - C4 - T1 - W1 - NOTE 1: PC PHONE OUT IN NAU STARLAN WORKSTATION C3 C1 NETWORK ACCESS UNIT - PEC 2614-100 NETWORK EXTENSION UNIT - PEC 2610-001 ATL LINE CP - PEC 62505 STARLAN CP - PE ...
AT&T 1987 AT&T - page 242

ATL Adapters The ATL adapter (KS23475) is a connection block that provides: 48V dc power from T1 (via modular cords C4 and Cl) to the ATL phone, data connections from the STARLAN workstation, and phone connections from the ATL phone (via modular cord Cl) over a shared common cable (C3) to System 25. The phone and data connections are on separate wi ...
AT&T 1987 AT&T - page 243

STATION HUNTING Description Provides linear, circular, or combinational hunting sequences for calls to busy single-line voice terminals and data terminals. Calls to a busy terminal may hunt to (only) one other terminal; however, up to five terminals may hunt to the same terminal. Although hunting is not available to or from multiline terminals, sin ...
AT&T 1987 AT&T - page 244

Interactions ● Attendant Camp-On: When the attendant extends a call to a busy terminal in a hunt group, the call hunts for an idle terminal. If none is found, the call Camps-On to the called terminal. ● Call Coverage: Station Hunting initially overrides all call coverage options. When a call to a voice terminal that has Call Coverage exhausts t ...
AT&T 1987 AT&T - page 245

STATION-TO-STATION MESSAGE WAITING Description Allows a multiline voice terminal to turn On a Message Waiting LED located on another multiline voice terminal by assigning a MSG WAIT button on each terminal. Pressing MSG WAIT causes the LED on the signaling and signaled terminals to light. This feature allows a user to inform another user that they ...
AT&T 1987 AT&T - page 246

SYSTEM ADMINISTRATION Description The software that controls System 25 operation consists of tables located in system memory. These tables contain data associated with: ● Trunk, Station, and Auxiliary Equipment Ports ● System Parameters ● Direct Group Calling Groups ● Toll Calls Allowed Lists ● Peripheral Equipment Data Communications Par ...
AT&T 1987 AT&T - page 247

A significant advantage of the AAS package is that it can be used either at the same location or can be used remotely via a dial-up connection. Procedures for performing Centralized and Advanced Administration are provided in System 25 Adrninistration Manual and System 25 Advanced Administration Manual, respectively. Considerations For RlV2, the de ...
AT&T 1987 AT&T - page 248

following characteristics: Display: The minimum display size is 16 lines by 80 columns. The port provides both carriage return and line feed characters to position the cursor at the start of the next line. Destructive scrolling is also expected (new lines added at the bottom of the screen and top- most lines disappear). Full duplex operation is req ...
AT&T 1987 AT&T - page 249

Figure 2-45. Model 703 System Administration Terminal 2-228 ...
AT&T 1987 AT&T - page 250

SYSTEM 25 PART OF CABINET OCTOPUS CABLE —— — PART OF ZTN82 SIP —— — OR ZTN128 C2 Z210A C1 CALL ● ADAPT. 355A/AF PROCESSOR —— — SYSTEM ADMINISTRATION TERMINAL —— — LEGEND : C1 - MODULAR CORD (D8W-87) - PEC 2725-07G C2 - OCTOPUS CABLE (WP90780) - PEC 2720-05P 355A ADAPTER RS 232 PLUG TO MODULAR JACK - PEC 2750-A24 355AF ADAP ...
AT&T 1987 AT&T - page 251

SYSTEM 25 PART OF CABINET OCTOPUS CABLE ZTN82 —— — OR ZTN128 C2 ● CALL PROCESSOR —— — PART OF SIP Z210A C1 355AF C3 Z3A4 ADU C1 ADAPT. ADAPT. PART OF SIP EQUIPPED WITH A THREE FOOT PLUG-ENDED EIA CORD - PEC 2169-001 EQUIPPEO WITH A 3 FOOT RECEPTACLE ENDED EIA CORD MODULAR POWER CORD (D6AP-87) MODULARIZES 2012D TRANSFORMER POWER ADAPTE ...
AT&T 1987 AT&T - page 252

SYSTEM 25 PART OF CABINET OCTOPUS PART OF CABLE ZTN82 SIP —— — OR ZTN128 C2 Z210A C1 C3 Z3A4 355AF CALL ● ADAPT. ADAPT. ADU PROCESSOR —— — (PORT X) PART OF SIP —————— — ❘ TN726 —— — ❘ C2 C1 TDM DATA Z210A 400B2 ● ❘ ❘ BUS LINE ADAPT. ADAPT. —— — ❘ —————— — ❘ C7 2012D 248B TRANS. ADA ...
AT&T 1987 AT&T - page 253

SYSTEM 25 CABINET PART OF CO OR PRIVATE OCTOPUS LINE CIRCUIT CABLE PART OF CONNECT VIA TAE —— — SIP ZTN82 —— — OR ZTN128 Z210A – CALL l ADAPT. PROCESSOR —— — C1 —— — 355AF – – TYPICAL MODEM TELCO CENTRAL OFFICE – SYSTEM ADMINISTRATION TYPICAL TERMINAL MODEM LEGEND: C1 - MODULAR CORD (D8W-87) - PEC 2725-07G C2 - OCTOP ...
AT&T 1987 AT&T - page 254

SYSTEM 25 CABINET ——————— ZTN82 OR ZTN128 CALL PROCESSOR TN758 POOLED MODEM TDM TN726 BUS DATA LINE —— — ❘ ❘ C2 C1 Z210A 400B2 ● ❘ ADAPT. ADAPT. ❘ ❘ C7 —————— — 2012D 248B — TN742 ANALOG LINE CO TRUNK FACILITY PART OF OCTOPUS PART OF CABLE SIP —— — C2 Z210A C1 355AF C3 Z3A4 ● ADAPT. ADU — AD ...
AT&T 1987 AT&T - page 255

SYSTEM MAINTENANCE Description The primary objective of System 25 maintenance is to detect, report, and clear troubles as quickly as possible and with minimum disruption to normal service. This goal is supported by periodic automatic diagnostic tests and fault detection hardware. System design allows most troubles to be resolved to the circuit pack ...
AT&T 1987 AT&T - page 256

● Most Recent System Errors : The ten Most Recent System Errors are recorded by the system, regardless of their level of severity. These are stored in the Most Recent System Errors log. Error Logs The three error logs can redisplayed via the System Administration Terminal. The data in the log is useful in diagnosing and analyzing troubles, partic ...
AT&T 1987 AT&T - page 257

TANDEM TRUNKING (V2) Descriptio n Tandem trunking provides an enhanced networking capability for System 25. With this feature, tie trunks can be used to call through System 25 to reach another switching system (CO or PBX ). Calls may be completed over on-network or off-network facilities. To be treated as tandem trunks, tie trunks must be assigned ...
AT&T 1987 AT&T - page 258

— If the requested trunk pool is dial accessible, an outgoing trunk is selected and the call proceeds normally. — If the requested trunk pool is not dial accessible, reorder tone is returned to the calling party. Any attempt to dial an outgoing trunk pool by non-tandem tie trunks (that is, tie trunks whose trunk number does not begin with 9) re ...
AT&T 1987 AT&T - page 259

TEST Descriptio n Provides users of the 7300H series voice terminals the ability to test their terminals. Placing the Test/Program (T/P) switch in the “T’’position causes all red and green LEDs to light alternately. The terminal also rings during the test. Consideration s Test assures users that all LEDs are working and that the built-in spea ...
AT&T 1987 AT&T - page 260

THIRD-PARTY CALL SETUP (V2) Description The Third-Party Call Setup feature allows a data terminal (the third party) in Command Mode to set up a call between an on-premises voice or data terminal (the source) and another voice or data terminal (the destination; can be on- or off-premises). Once the call has been set up, the third-party drops off and ...
AT&T 1987 AT&T - page 261

Setting Up A Third-Party Call To set up a call from the third-party data terrninal, the user selects <Voice call> from the entry-level Command Mode menu (see Figure 2-51). The user then enters the characters as required to call the destination terminal. Calls may be completed as follows. Note: If a character is entered incorrectly, the ASCII ...
AT&T 1987 AT&T - page 262

Interaction s ● Call Coverage Third-Party Call Setup calls to the source terminal will not be directed to a coverage station. If the source terminal is not answered before coverage is invoked, the call is dropped and the NO ANSWER/DISCONNECTED messages are displayed at the third-party data terminal. ● Call Following If calls to a source termina ...
AT&T 1987 AT&T - page 263

TIE TRUNKS Description Provides a private communications link between System 25 and another PBX. Incoming tie trunk calls may be directed to the attendant, to a voice terminal, or to a data endpoint. Service may be either automatic, immediate dial, delay dial, or wink start. Dial pulse or touch-tone signalings supported on both incoming and outgoin ...
AT&T 1987 AT&T - page 264

● Assign Night Service Delay Announcement (1, 2, or 0 for none) - Default = 0 ● Dial-Inward Capability (Tone or Pulse) - Default = Pulse. Hardware Requirements Requires port interfaces on a TN760B Tie Trunk CP. 2-243 ...
AT&T 1987 AT&T - page 265

TOUCH-TONE AND DIAL PULSE SERVICES Descriptio n All single-line voice terminals and MET sets are equipped with touch-tone dial pads that generate Dual Tone Multifrequency (DTMF) signals when a dial button is pressed. The 7300H series (MERLIN) voice terminals are equipped with touch dial pads that generate digitally coded signals when a dial button ...
AT&T 1987 AT&T - page 266

Description Allows a user to transfer any call to another voice terminal. A user can transfer calls either with or without announcement. A multiline terminal user presses TRANSFER; the party is automatically placed on Special Hold (indicated by a broken-flutter on the status LED of the call appearance button) and may receive Music-On- Hold, if avai ...
AT&T 1987 AT&T - page 267

calls over a transferred trunk. ● Hold: An outside call placed on hold during call transfer receives music-on-hold, if available. A user attempting to return to a held internal call that has been abandoned will hear nothing. A user attempting to return to a held CO trunk call that has been abandoned hears CO dial tone or receives CO intercept tre ...
AT&T 1987 AT&T - page 268

TRANSFER TO DATA Descriptio n Allows multiline voice terminal users to originate or answer a call from their voice terminals and then establish a data connection by transferring the call to a data terminal. This feature was formerly called One-Button Transfer to Data (V1). (Refer also to the overview of the system’s data features provided in the ...
AT&T 1987 AT&T - page 269

Preindication is canceled: ● If the user goes on-hook before transferring the call to data ● If the user preindicates on a second DATA button ● If, after dialing is complete, a second DATA button is pressed. Preindication is canceled for the first data terminal and the data call is transferred to the second data terminal. When Preindication i ...
AT&T 1987 AT&T - page 270

TRUNK GROUPS Descriptio n Allows each trunk in the system to reassigned to one of up to 16 trunk groups. Trunks link two switching systems, such as System 25 and the local CO or System 25 and another PBX. Although not required, trunks can be grouped together in trunk groups (sometimes referred to as pooled facilities) when all the trunks in the gro ...
AT&T 1987 AT&T - page 271

Trunk groups connecting with a local CO, WATS office, or FX office can be ground or loop start. DID trunk groups can be immediate or wink start. Tie trunks groups can be automatic, wink start, immediate start, or delay dial. Dual Tone Multifrequency (DTMF) signaling (touch-tone) or dial pulse signaling can be used between the System 25 and the far ...
AT&T 1987 AT&T - page 272

Administration Requirements Trunk Port: ● Assign Trunk Type And Number ● Assign Class Of Service Code [DID - (l-4); Other - (0-15)] ● Assign Facility Access Code - Default (See Note) ● Allow Dial Access (Yes, No) - Default = Yes ● Assign To DGC Group (Group Number 1-32, or O for none) - Default = ✐ ● Make This a Directed Night Service ...
AT&T 1987 AT&T - page 273

TRUNK-TO-TRUNK TRANSFER Description Allows users to connect incoming trunk calls to other outside trunks and then hang up (under certain conditions). Incoming trunk calls may be transferred to another trunk, or conference with another trunk. In all cases and at all times, either a System 25 station must remain in the conference or one of the calls ...
AT&T 1987 AT&T - page 274

USER CHANGEABLE OPTIONS (V2) Description User Changeable Options allows a data terminal user who is in the Command Mode to view and change the settings of certain data port options. This feature is available to users of Data Line CP ports; users of STARLAN Interface CP ports cannot change their port options. Table 2-J contains brief descriptions of ...
AT&T 1987 AT&T - page 275

(ENTRY LEVEL) DIAL: DIAL: <eXit> <All> DISCONNECTED <Data call> <Voice call> <Options> <Hangup> <eXit> {Change options> <View options> (Options Displa y table ) <eXit> <Speed> <Parity> <permit Mismatch> <local Echo> <Others> <eXit> <Odd> <Even> ...
AT&T 1987 AT&T - page 276

Viewing Options When <View options> is selected, current and default values for the various data port options are displayed, as shown below: OPTIONS Speed (highest) Parit y Mismatch Local Echo Answer Text Connect Indicat. Recall Sequence CURRENT DEFAULT 9600 19200 (Auto) Even Even Yes No Yes Yes Yes Yes Yes Yes Br - Br Br-B r <eXit> < ...
AT&T 1987 AT&T - page 277

Changing Data Port Speed The procedure for changing Speed settings is different from the procedure for changing the settings of other options. Within the Speed menu, the user may find that several values are marked with Xs. To change a speed, move the cursor beneath each value to be changed and ty p e “+” to add the value or “-” to delete i ...
AT&T 1987 AT&T - page 278

● If the user selects <Enable options> , the system incorporates the changes requested and displays the message DISCONNECTED. If Autobaud is off, the user must now press BREAK to return to Command Mode. If Autobaud is on, the user must press BREAK and RETURN to return to Command Mode. Note: If a user attempts to enable options during a “S ...
AT&T 1987 AT&T - page 279

VIRTUAL FACILITIES (V2) Description A virtual facility (VF) is a call routing facility that is not defined by the physical facility (trunk) over which calls are routed, but is instead defined by a combination of access codes, authorization codes, and coded characters that allow special handling of the destination telephone numbers. VFs can be used ...
AT&T 1987 AT&T - page 280

Whenever a VF is used to complete a call (either by dial access or through ARS), call processing treats the number as a physical facility for Station Message Detail Recording (SMDR) purposes. Thus, if VF code #190 is used to complete a call, the SMDR call record will show “#190” as the facility used. A VFN may contain up to 28 characters. The p ...
AT&T 1987 AT&T - page 281

The “#5” indicates that the destination number should be inserted here, rather than at the end of the VF translation. — The “#*” indicates that the system should transmit a “*” symbol as the first character of an identification code. — The “12345” represents the remaining characters in the identification code. ● Example 3: VF ...
AT&T 1987 AT&T - page 282

— Since “#5” was not embedded within this VFN, the destination telephone number (12125551643) will be transmitted after the WATS access code. VF codes may be included in numbers stored in REP DIAL buttons, System Speed Dialing codes, and Personal Speed Dialing codes if the VF code is used at the beginning of these numbers. VF codes may not be ...
AT&T 1987 AT&T - page 283

LIST OF FIGURES Figure 3-1. System 25 Digital Switch. . . . . . . . . . . . . . . . . 3-1 Figure 3-2. Call Processor (ZTN82 or ZTN128) Circuitry . . . . . . . . . . 3-3 Figure 3-3. Memory (ZTN81 or ZTN127) Circuitry . . . . . . . . . . . . 3-5 Figure 3-4. TDM Bus Time Slot Generation (Not A Timing Diagram) . . . . . 3-6 Figure 3-5. TDM Bus Diagram ...
AT&T 1987 AT&T - page 284

LIST OF TABLES TABLE 3-A. TDM BUS Time Slots . 3-8 3-34 3-34 . . . ..... . . . . . . . . . . . . . . . . . . . . . . . . . . . TABLE 3-B. Signaling Type Summary . . . . . TABLE 3-C. TN7670B Tie Trunk Preferred Signaling Formats -iii - ...
AT&T 1987 AT&T - page 285

SECTION 3—FUNCTIONAL DESCRIPTION This section describes how the digital switch and the software of System 25 provide control and switching. Digital Switch Figure 3-1 shows a sehematic diagram of the System 25 digital switch. The basic switch hardware consists of the following: ● Common Control — Memory Bus Call Processor Circuit Pack (CP) — ...
AT&T 1987 AT&T - page 286

Common Control The Common Control circuitry consists of the Call Processor (ZTN82 in R1V1 or ZTN128 in R1V2) and Memory (ZTN81 in R1V1 or ZTN127 in R1V2) Circuit Packs and associated memory bus which is a 60-wire (including grounds), 39-bit (16-data, 23-address,), 6 MHz frontplane flat ribbon cable. Call Processor Circuit Pack (ZTN82 or ZTN128) The ...
AT&T 1987 AT&T - page 287

TO EMERGENCY EIA CHANNELS TRANSFER UNIT (RS-232C) (ETU) INTERRUPT CIRCUITRY / — — BUS ERROR MICROPROCESSOR CIRCUITRY — (68010) LED TDM BUS LEADS SERIAL SERIAL SERIAL SERIAL -48V DC CHANNEL CHANNEL CHANNEL CHANNEL 1 2 3 4 ETU CONTROL EIA CONTROL EIA CONTROL RESET CIRCUITRY PROCESSOR BUS ● ● ● ● ● ● MEMORY MANAGEMENT NETWORK CON ...
AT&T 1987 AT&T - page 288

Network Controller: The network controller transmits control channel messages between the Call Processor and the port circuits over the TDM bus. The controller also monitors system clocks. The controller includes an 8-bit microprocessor that acts as a throttle passing messages between the Call Processor and the port board microprocessors. All uplin ...
AT&T 1987 AT&T - page 289

Memory Circuit Pack (ZTN81 or ZTN127) The Memory Circuit Pack provides for the storage of software associated with system operation. This software includes call and administration processing, and other related programs. The circuit pack is powered from the backplane by +5 volts. Each system must include one Memory Circuit Pack. The Memory Circuit P ...
AT&T 1987 AT&T - page 290

Switching Network System 25 uses distributed processing techniques to provide switched voice and data services. The switch operates at 64 Kbps. The switching network consists of the following: ● Time Division Multiplex (TDM) bus ● Port Circuits ● System Resource Circuits. The TDM bus connects the intelligent ports to the Common Control circui ...
AT&T 1987 AT&T - page 291

Two time slots are required for each 2-party conversation. Each party transmits (talks) on one time slot and receives (listens) on another. Only five parties are allowed in a conference. During a conference connection, each member of the conference transmits on an individual time slot while receiving on as many as four other time slots. The actual ...
AT&T 1987 AT&T - page 292

TABLE 3-A. TDM BUS Time Slots Time Slot No. 00 thru 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 thru 254 25 5 Function Control (5) -Tones- Dial Tone Busy Tone Re-order Tone Ringback Tone Data-Null Voice-Null Music 697 Hz* 770 Hz* 852 Hz* 941 Hz* 1209 Hz* 1336 Hz* 1447 Hz* 1637 Hz* (15) Call Processing (235) Not Used (1) * These tones are use ...
AT&T 1987 AT&T - page 293

TDM BUS TERMINATOR CARD TDM BUS EXTENDER CABLE CABINET 3 ON/OFF SWITCH AC POWER # 6 AWG BUILDING GROUND WIRE CABINET 2 AC POWER #6 AWG GROUND WIRE CABINET 1 COUPLED BONDING CONDUCTOR (CBC) AC POWER TO SINGLE POINT GROUND Figure 3-5. TDM Bus Diagram -Three Cabinet System 3- 9 ...
AT&T 1987 AT&T - page 294

Port Circuits The following port circuit packs provide the link between trunks and external equipment and the TDM bus: ● Analog Line (TN742) ● ATL Line (ZTN79) ● Auxiliary Trunk (TN763) ● Data Line (TN726) ● DID Trunk (TN753) ● Ground Start Trunk (ZTN76) ● Loop Start Trunk (ZTN77) ● MET Line (TN735) ● STARLAN Interface (ZTN84) ● ...
AT&T 1987 AT&T - page 295

SINGLE-LINE VOICE TERMINALS (420, 500, 2500, 2514, 2554, 7101A) ——————— — RECORDED ANNOUNCEMENTS ——————— — DICTATION EQUIPMENT ——————— — EXTERNAL ALERTING DEVICES ——————— — MUSIC-ON-HOLD MULTILINE VOICE TERMINALS (7300H-TYPE) ——————— — DIRECT TRUNK ATTENDANT CONSOLE (73 ...
AT&T 1987 AT&T - page 296

SAT, DTU, SMDR, Z3A1 Z3A4 CAS (ON-PREMISES ADU ADU DIRECT CONNECTION) * * *REQUIRED FOR CONNECTIONS >50 FEET OR NOT SHARING SAME AC OUTLET —————————————— — SAT, SMD, CAS (ON-PREMISES Z3A1/4 SWITCHED CONNECTION) ADU TN726 DATA LINE CP Z3A4 ADU TN726 DATA LINE CP —————————————— — SAT, SMD ...
AT&T 1987 AT&T - page 297

DATA TERMINAL RS-232C EQUIPMENT, HOST COMPUTER Z3A1/2/4 TN726 DATA LINE CP ADU SINGLE-LINE VOICE TERMINAL (2500-TYPE OR 7101A) DATA TERMINAL RS-232C EQUIPMENT, HOST COMPUTER Z3A5 TN726 DATA LINE CP ADU MULTILINE VOICE TERMINAL (7300H-TYPE) CO, FX, WATS ———— — PAGING EQUIPMENT DID TRUNKS TN753 DID TRUNK CP TN760B TIE TRUNKS LEGEND : AD U ? ...
AT&T 1987 AT&T - page 298

Eight port circuits are provided on most port circuit packs. The Multibutton Electronic Telephone (MET) Line, Tie Trunk, and Auxiliary Trunk Circuit Packs each contain four port circuits. The port circuits provide an interface between terminals/trunks and the TDM bus. The number of port circuit packs required varies according to customer requiremen ...
AT&T 1987 AT&T - page 299

The NPEs do switching network functions for the port circuits. Under control of the on- board microprocessor, an NPE can connect a port circuit to any one of the TDM bus time slots. More specifically, it allows a port circuit to talk on one time slot and listen to the same time slot (NPE sidetone) and on up to four other time slots at the same time ...
AT&T 1987 AT&T - page 300

Ground Start Trunk (ZTN76) The Ground Start Trunk Circuit Pack interfaces eight central office trunks and the TDM bus. Figure 3-8 shows the following Ground Start Trunk unique circuitry: ● Ground detector circuit ● Port Input/Output (I/O) circuit ● Eight port circuits. Ground Detector Circuit: The ground detector circuit determines if ground ...
AT&T 1987 AT&T - page 301

NPE O NPE 1 ● ❘ PORT T.3 ❘ ❘ ● ON-BOARD MICROPROCESSOR PORT 1/0 CIRCUIT ● ● PORT ● CIRCUIT ● 4 R.4 GROUND DETECTOR PORT CIRCUIT 0 CODEC HYBRID T.O R.O CIRCUIT 3 R.3 T.4 TO CENTRAL OFFICE ● ❘ ❘ ❘ T.7 PORT CIRCUIT 7 R.7 / Figure 3-8. Unique Ground Start Trunk (ZTN76) Circuitry 3-17 ...
AT&T 1987 AT&T - page 302

Loop Start Trunk (ZTN77) The Loop Start Trunk Circuit Pack interfaces eight central office loop start trunks and the TDM bus. Figure 3-9 shows the following Loop Start Trunk unique circuitry: ● Port Input/Output (I/O) circuit ● Eight port circuits. Port I/O Circuit: This, circuit consists of bus expanders for communication between the on-board ...
AT&T 1987 AT&T - page 303

NPE O ● NPE 1 ❘ ❘ ❘ ON-BOARD MICROPROCESSOR PORT CIRCUIT o CODEC HYBRID PORT I/O CIRCUIT T.O R.O T.3 PORT CIRCUIT 3 R.3 ● ● T.4 ● PORT ● CIRCUIT ● 4 R.4 ❘ ● ❘ ❘ T.7 PORT CIRCUIT 7 R.7 Figure 3-9. Unique Loop Start Trunk (ZTN77) Circuitry TO CENTRAL OFFICE / 3-19 ...
AT&T 1987 AT&T - page 304

Tip Ring Line (ZTN78) The Tip Ring Line Circuit Pack interfaces eight analog tip and ring voice terminal lines (single-line voice terminals) and the TDM bus. Figure 3-10 shows the following Tip and Ring Line unique circuitry: ● Ringing application circuit ● Port Input/Output (I/O) circuit ● Eight port circuits. NPE O NPE 1 POR T I/O ● CIR ...
AT&T 1987 AT&T - page 305

Ringing Application Circuit: This circuit receives ringing voltage from the power supply. It monitors ringing voltage and current and generates signals to the on-boar d microprocessor indicating zero ringing voltage and current. It also detects when a terminal user has lifted the receiver during ringing preventing the application of ringing to the ...
AT&T 1987 AT&T - page 306

ATL Line (ZTN79) The ATL I,ine Circuit Pack interfaces eight hybrid voice terminal (7300H series) lines and the TDM bus. It terminates three pairs of wires from each terminal: analog voice pair, digital control pair, and power pair. Figure 3-11 shows the following ATL Line unique circuitry: ● Protocol handler ● Eight port circuit. Protocol Hand ...
AT&T 1987 AT&T - page 307

/ NPE 0 ❘ ❘ ❘ T.3 R.3 PORT TXT.3 CIRCUIT TXR .3 3 PXT .3 T.4 R.4 PORT TXT .4 CIRCUIT TXR.4 4 PXT.4 PXR.4 ❘ ❘ T.7 R.7 PORT TXT.7 CIRCUIT TXR .7 7 PXT.7 ● DATA TRANSCEIVER PROTOCOL HANDLER ● ELECTRONIC POWER FEED ON-BOARD MICROPROCESSOR ON-BOARD MICROPROCESSOR / PXR.1 PORT CIRCUIT o ANALOG PORT CODEC HYBRID ISOLATION TRANSFORMER T.O ...
AT&T 1987 AT&T - page 308

Data Line (TN726) The Data Line Circuit Pack interfaces eight Asynchronous Data Units (ADUs) data devices and the TDM bus. The ADUs are typically, in turn, connected to RS-232 type devices. Figure 3-12 shows the Data Line unique circuitry that includes: ● A bit clock ● Bus isolation ● Eight port circuit. Bit Clock: The bit clock circuitry is ...
AT&T 1987 AT&T - page 309

/ ● NPE 0 ● ● ● ON-BOARD MICROPROCESSOR ● ● / ● ● NPE 1 A PORT CIRCUIT 0 ASYNCHRONOUS PXT.O PROTOCOL DATA PXR.0 HANDLER UNIT TXT.0 (OATMEAL) (ADU) TXR.0 A PORT CIRCUIT 1 A PORT CIRCUIT 2 BUS ISOLATION ● A PORT CIRCUIT 3 ● ● ● A PORT CIRCUIT 4 ● ● ● A PORT CIRCUIT 5 ● ● BIT CLOCK ● A PORT ● CIRCUIT ● 6 A ...
AT&T 1987 AT&T - page 310

MET Line (TN735) The MET Line Circuit Pack interfaces four Multibutton Electronic Telephone (MET) lines and the TDM bus. The MET Line unique circuitry consists of four port circuits as shown in Figure 3-13. Port Circuits: The four port circuits are identical. Each port circuit consists of an analog port, a digital port, and an electronic power feed ...
AT&T 1987 AT&T - page 311

● ● ON-BOARD MICRO- PROCESSOR NPE PORT CIRCUIT 0 ANALOG PORT DIGITAL PORT ELECTRONIC POWER FEED T.O R.O BT.O BR.O LT.O LR.O ❘ ● ❘ ❘ T.3 TO MET TERMINALS R.3 PORT CIRCUIT BT.3 ● 3 BR.3 LT.3 LR.3 / Figure 3-13. Unique MET Line (TN735) Circuitry 3-27 ...
AT&T 1987 AT&T - page 312

Analog Line (TN742) The Analog Line Circuit Pack interfaces eight analog voice terminal lines and the TDM bus. Figure 3-14 shows the following Analog Line unique circuitry: ● Ringing application circuit ● Port Input/Output (I/O) circuit ● Eight port circuits. PORT CIRCUIT 0 ELECTRONIC CODEC HYBRID BATTERY FEED OVERVOLTAGE PROTECTION ● ❘ T ...
AT&T 1987 AT&T - page 313

Ringing Application Circuit: This circuit receives ringing voltage from the power supply. It monitors ringing voltage and current, generates signals to the on-board microprocessor indicating zero ringing voltage and current, and detects a terminal user lifting the receiver during ringing. This prevents the application of ringing to the port circuit ...
AT&T 1987 AT&T - page 314

DID Trunk (TN753) The DID Trunk Circuit Pack interfaces eight central office trunks arranged for Direct Inwrd Dialing ((DID) and the TDM bus. Figure 3-15 shows the following DID Trunk unique circuitry: ● Port Input/output (1/0) circuit ● Eight port circuits. Port I/O Circuit: This circuit consists of bus expanders for communication between the ...
AT&T 1987 AT&T - page 315

NPE O NPE 1 ON-BOARD MICROPROCESSOR PORT CIRCUIT 0 TRUNK INTERFACE UNIT T.O CODEC HYBRID R.O ● ❘ ❘ ❘ PORT PORT T.3 CIRCUIT 3 R.3 I/O ● ● CIRCUIT ● ● ● PORT T.4 CIRCUIT 4 R.4 ● ● ❘ ❘ ❘ PORT T.7 CIRCUIT 7 R.7 TO CENTRAL OFFICE / Figure 3-15. Unique DID Trunk (TN753) Circuitry 3-31 ...
AT&T 1987 AT&T - page 316

Tie Trunk (TN760B) The Tie Trunk Circuit Pack interfaces four 6-wire tie trunks and the TDM bus. Two tip and ring pairs form a 4-wire analog transmission line. An E and M pair are used for signaling. The T and R pair transmit analog signals from the circuit pack. The T1 and RI pair receive analog signals from the tie trunk. The E and M pair are dc ...
AT&T 1987 AT&T - page 317

NPE ❘ ● ON-BOARD MICRO- PROCESSOR T.O PORT I/O CIRCUIT GROUND DETECTOR PORT CIRCUIT 0 R.O T1.0 R1.O E.O ● M.0 ❘ ❘ ❘ ● T.3 R.3 PORT T1.3 CIRCUIT R1.3 3 E.3 M.3 / Figure 3-16. Unique Tie Trunk (TN760B) Circuitry TO TIE TRUNKS UNPROT . 000 0 0 0 0 0 / PORT: 4 3 2 1 PROT . SMPLX SMPLX SMPLX SMPLX PORT 4 PORT 3 PORT 2 PORT 1 E&M E&am ...
AT&T 1987 AT&T - page 318

TABLE 3-B. Signaling Type Summary SIGNALING TRANSMIT RECEIVE TYPE ON-HOOK OFF-HOOK ON-HOOK OFF-HOOK I Std. grd bat open/bat (*) grd I Compat. open/bat (*) grd grd open/bat (*) V open grd open grd * An open circuit is preferred over voltage. TABLE 3-C. TN760B Tie Trunk Preferred Signaling Formats INSTALLATION SITUATION PREFERRED SIGNALING FORMAT SYS ...
AT&T 1987 AT&T - page 319

Auxiliary Trunk (TN763) The Auxiliary Trunk Circuit Pack interfaces four ports provided for client-provided equipment (CPE) and the TDM bus. It is connected to the CPE by up to three pairs of wires. The transmission pair (T and R) carry voice signals and touch-tone control signals. The T and R also provide a loop start seizure indication to the CPE ...
AT&T 1987 AT&T - page 320

NPE ● ON-BOARD MICROPROCESSOR PORT I/O CIRCUIT GROUND DETECTOR T.O R.O ● PORT S.0 CIRCUIT S1.0 0 SZ.0 SZ1.0 I I I I I TO AUXILIARY EQUIPMENT ● ❘ T.3 R.3 PORT S.3 CIRCUIT S1.3 3 SZ.3 SZ1.3 / Figure 3-18. Unique Auxiliary Trunk (TN763) Circuitry 3-36 ...
AT&T 1987 AT&T - page 321

STARLAN Interface (ZTN84) (V2) The STARLAN Interface (ZTN84) is a System 25 circuit pack (CP) designed to function as either a gateway or a bridge between the PBX and the AT&T STARLAN NETWORK. The ZTN84 contains much of the circuitry common to the other CPS in the system, that is a Sanity and Control Interface (SAKI), a Network Processing Eleme ...
AT&T 1987 AT&T - page 322

System Resources The System Resource Circuit Packs (CP) are as follows: ● Service Circuit (ZTN85) ● Tone Detector (TN748) ● Pooled Modem (TN758). Service Circuit (ZTN85) The Service Circuit CP provides the clock signals of the system. It also generates and receives tones. The Service Circuit CP (Figure 3-19) consists of the following: ● Bus ...
AT&T 1987 AT&T - page 323

generator and time slot table circuits with the TDM bus. Tone Generator: The tone generator consists of a digital signal processor (DSP), a counter, and a dual-port tone RAM. The DSP operates at 10 MHz and produces .24 different tones. The dual-port tone RAM stores these tones in 24 different addresses. The counter under control of the tone clock c ...
AT&T 1987 AT&T - page 324

TONE GENERATOR (DSP) TONE TIME TABLE SLOT (DPRAM) TABLE (DPRAM) TDM BUS BUS BUFFER ● LEADS ● SAKI ● CIRCUIT PACK ADDRESS LEADS ● ● LEDs NETWORK BUS RED YELLOW GREEN RAM ADDRESS & DATA BUS U-CONTROL ● NPE TONE OUTPUT DETECTORS REGISTERS ● SYSTEM CLOCK Figure 3-19. Service Circuit (ZTN85) 3-40 ...
AT&T 1987 AT&T - page 325

Tone Detector (TN748) The Tone Detector Circuit Pack provides four touch-tone receivers and two general purpose tone receivers that detect appropriate system and network tones on the TDM bus. The Tone Detector CP consists of the same common circuitry as the intelligent port circuits and the following unique circuits (see Figure 3-20): ● Port I/O ...
AT&T 1987 AT&T - page 326

/ ❘ ● ❘ PORT CIRCUIT ❘ ● NPE 1 ● 1 PORT ● CIRCUIT 7 ● PORT CIRCUIT 4 ● ● RAM ● PORT CIRCUIT / 5 ● ❘ ON-BOARD PORT ❘ SAKI ● MICRO- I/O ● PROCESSOR CIRCUIT ❘ ● PORT CIRCUIT / ● NPE PORT TDM BUS LEADS BUS BUFFERS 0 CIRCUIT 3 CIRCUIT PACK ADDRESS LEADS / LEDS RED PORT CIRCUIT 0 GREEN YELLOW 2 ● SANITY C ...
AT&T 1987 AT&T - page 327

Pooled Modem (TN758) The Pooled Modem Circuit Pack supports 0-300 and 1200 bits per second (bps) data speeds and provides the following: ● Circuitry to provide a signal compatible with the modulation formats of the 212- series modems ● Modem emulation (see below) Capability Data Module Mode 0-300 Asynchronous Low 300 Asynchronous 300 Asynchrono ...
AT&T 1987 AT&T - page 328

Common Circuitry: The Pooled Modem common circuitry that includes all circuitry shown on Figure 3-21 except the Conversion Resource circuitry provides the same general function as the intelligent port common circuitry. Conversion Resources: The two conversion resources (port circuits) are identical and each contain the following: ● Microprocessor ...
AT&T 1987 AT&T - page 329

Software The System software consists of switched services, administrative, and maintenance software. This software runs on top of the real-time operating system software. Switched Services Software The switched services software provides voice and data call processing. This software resides in the Call Processor and Memory Circuit Packs (that are ...
AT&T 1987 AT&T - page 330

Traffic load, defined as the sum of static and dynamic loads, is a function of the number of features that are executed, the frequency with which they are executed, the system configuration, and the instantaneous (peak) call processing load. The configuration contribution to load is known as dynamic load. The static load consists of maintenance and ...
AT&T 1987 AT&T - page 331

Error Logger: Prioritizes and stores system errors. The errors are stored in three error records (located in System RAM), that are: ● Permanent System Alarms ● Transient System Errors ● Most Recent System Errors. The Error Logger lights the Alarm LED (located on the Attendant Console) when a serious error is detected. Operating System (OS): C ...
AT&T 1987 AT&T - page 332

` / FEATURE CODE MODULES MEMORY STATION CIRCUIT SMDR ADMINISTRATION CALL ● ● ● PACK (TASK) PROCESSING PROCESSING (TASK) (TASK) ▲ ▲ ▼ ▼ SYSTEM RAM ERROR CALL PROCESSOR LOGGER CIRCUIT PACK ▲ MESSAGE SEND/RECEIVE ———————————————————————— — ▲ ▼ / VOICE TERMINALS, SAT, CO FACILITIES ...
AT&T 1987 AT&T - page 333

6. The Station Call Processing task retrieves its message and interprets it as a call origination. The task determines whether there is an idle call appearance button (System Access button) on the called voice terminal. If so, two available time slots are reserved for the connection. 7. The task sends downlink messages to the port circuit via the O ...
AT&T 1987 AT&T - page 334

LIST OF FIGURES Figure 4-1. System 25 Cabinets (J58901A)—Three Cabinet System . . . . . . 4-2 Figure 4-2. System Cabinet (J58901A)—Rear View . . . . . . . . . . . . 4-3 Figure 4-3. System Circuit Pack Configurations . . . . . . . . . . . . . 4-5 Figure 4-4. Model 2500 Series (Analog) Voice Terminals . . . . . . . . . . 4-14 Figure 4-5. Model 71 ...
AT&T 1987 AT&T - page 335

Figure 4-29. Typical ADU Connections—Supporting Data Terminal And 7300H Series Multiline Voice Terminal . . . . . . . . . . . . . . . . . 4-60 Figure 4-30. Typical MADU Connections . . . . . . . . . . . . . . . . 4-61 Figure 4-31. Z3A1/2/4 ADU Local Power Connections . . . . . . . . . . . 4-62 LIST OF TABLES TABLE 4-A. Total Port Circuit Packs Pe ...
AT&T 1987 AT&T - page 336

SECTION 4—HARDWARE DESCRIPTION This Section provides descriptions of System 25 hardware components and their functions. The hardware is covered under the following major headings: ● System Cabinets: Includes Circuit Pack (CP) carriers and CPs. ● Terminal Equipment: Equipment that can be connected to voice or data station ports. ● Peripheral ...
AT&T 1987 AT&T - page 337

The front cover of the cabinet is secured by four screws. These screws must be loosened slightly before the cover can be removed. When removed, access is provided to the CPs, a replaceable air filter mounted just under the CP carrier frame, and two cooling fans. The cooling fans are mounted on an assembly that, when unscrewed, provides access to th ...
AT&T 1987 AT&T - page 338

Each cabinet has its own power supply mounted to the left of the CP carrier. The power supply is 3 inches wide and weighs about 9 pounds. Voltage and current supplied to the carrier are: +5 V dc at 35A, -5 V dc at 3A, -48 V dc at 3A, and 90 V ac at 0.16A. On the front of the supply is a green Light Emitting Diode (LED) that, when lighted, indicates ...
AT&T 1987 AT&T - page 339

Cabinet 1 (Control and Port Circuits) Cabinet 1 (Figure 4-3) is always required. It provides mounting space for 12 CPs and can support a small telecommunications system (eg., 50 to 60 stations and 10 to 15 trunks). It contains a Memory and Call Processor that together are referred to as the Common Control (CC), a Service Circuit, and up to 9 port C ...
AT&T 1987 AT&T - page 340

CIRCUIT PACK SLOTS 1 2 3 4 5 6 7 8 9 10 11 12 POWER PORT CIRCUITS SERVICE CIRCUIT CALL PROCESSOR (a) CABINET 1 - (MOUNTING FOR 3 CONTROL & 9 PORT CIRCUIT PACKS) CIRCUIT PACK SLOTS 1 2 3 4 5 6 7 8 9 10 11 12 POWER PORT CIRCUITS SUPPLY (b) CABINET 2 OR 3 - (MOUNTING FOR 12 PORT CIRCUIT PACKS) NOTES : 1. REFER TO TECHNICAL SPECIFICATIONS, SECTION ...
AT&T 1987 AT&T - page 341

TABLE 4-A. Total Port Circuit Packs Per System NUMBER PORT TOTAL PORT OF CABINET CIRCUIT CIRCUIT CABINETS NUMBER * PACKS PACKS † 1 Cabinet 1 9 9 2 Cabinet 1 9 21 Cabinet 2 12 3 Cabinet 1 9 33 Cabinet 2 12 Cabinet 3 12 * Cabinet 1 (always required)—Provides mounting for Memory, Call Processor, Service Circuit, and Port CPs including Tone Detecto ...
AT&T 1987 AT&T - page 342

Circuit Packs Required Circuit Packs: The following CPs are provided with all systems and must be mounted in Cabinet 1: ● ZTN82 (V1) or ZTN128 (V2) Call Processor The ZTN82 or ZTN128 (one per system) provides a central processing unit, Random- Access Memory (RAM) (memory) for call and feature processing, interrupt controller, programmable timers, ...
AT&T 1987 AT&T - page 343

● TN758 Pooled Modern Provides two integrated 212-modem compatible conversion resources for switched connections between analog endpoints (modems), or a digital endpoint and an analog endpoint. A maximum of two TN758s (4 conversion resources) is permitted in each cabinet. Station Port Circuit Packs ● TN726 Data Line Provides eight ports for Asy ...
AT&T 1987 AT&T - page 344

Trunk Port Circuit Packs ● TN753 DID Trunks Provides eight ports for immediate-start or wink-start Direct trunks. ● TN760B Tie Trunks Inward Dialing (DID) Provides four ports for Type 1 E&M, Type 1 E&M Compatible, or Type 5 Simplex tie trunks. Operating protocols include automatic, immediate-start, wink-start, or delay dial. The TN760B ...
AT&T 1987 AT&T - page 345

Circuit Pack Features All system CPs have the following features: ● Solid-state circuitry mounted on 7.6 by 14.1-inch printed wiring board (TN-type) ● Color coded face plate labels identify the CP type and function (White = Control, Purple = Port or System Resource) ● Individual circuit functions all contained on one CP ● Metal tab for grou ...
AT&T 1987 AT&T - page 346

Table 4-B lists CPs that can be used with System 25. A description of each CP is provided in Section 3, Functional Description. TABLE 4-B. System Circuit Packs CIRCUIT NUMBER CIRCUIT PACK TITLE PAC K OF TYPE * PORTS TN726 Data Line P 8 TN735 MET Line P 4 TN742 Analog Line P 8 TN748 Tone Detector † R 4 TN753 DID Trunk P 8 TN758 Pooled Modem R 2 TN ...
AT&T 1987 AT&T - page 347

Terminal Equipment Terminal equipment is connected to System 25 station (voice or data) ports. It is made up of the following groups: ● Voice Terminals — Single-Line — Multiline (MERLIN sets and MET sets) ● Voice Terminal Adjuncts ● Attendant Consoles ● Asynchronous Data Units (for interface with data terminals). This subsection provide ...
AT&T 1987 AT&T - page 348

TABLE 4-C. Summary of Voice Terminals TERMINAL CIRCUIT PACK TYPE * MODEL DESCRIPTION INTERFACE 420 Memory Set W/Built-In Speakerphone 500MM Rotary Desk Set ZTN78 Single-Line 500SM Rotary Set Compatible Tip Ring with 4A Speakerphone TN742 (Analog) 554BMPA Rotary Wall Set † 2500MMGB Basic Touch-Tone Desk Set 2500DMGC Basic Desk with Message Waiting ...
AT&T 1987 AT&T - page 349

Model 2500 Series Each of the following Model 2500 voice terminals come equipped with: ● Handset ● Touch-Tone Dial (Dual Tone Multifrequency - DTMF) ● Ringer Volume Control. Several 2500 series voice terminals are shown in Figure 4-4. Supported 2500 series sets include the following: ● Model 2500 DMGC—Desk Set with message waiting indicat ...
AT&T 1987 AT&T - page 350

Model 7101A (MD) (PEC 3170-00M) The Model 7101A (Figure 4-5) is about 2-3/4 inches wide, 3-1/2 inches high, and 8-1/2 inches long. The set comes equipped with the following: ● ● ● ● ● Handset Touch-Tone Dial Message Indicator Tone Ringer with Volume Control Two Fixed Feature Buttons — — Recall—Used to place a call on hold and to obt ...
AT&T 1987 AT&T - page 351

420 Speakerphone (V2) The 420 Speakerphone (Figure 4-6) is a single-line voice terminal that can be desk or wall mounted. This set comes equipped with the following: ● Handset ● Touch-Tone Dial ● Built-In Speakerphone ● Twelve Memory Buttons—Where emergency numbers and frequently called numbers can be stored for quick calling. ● Six Fix ...
AT&T 1987 AT&T - page 352

MEMORY BUTTONS REDIAL BUTTON PROGRAM BUTTON FLASH BUTTON HOLD BUTTON SPEAKERPHONE BUTTON AND LAMP MUTE BUTTON VOLUME SPEAKER RECEIVER CONTROL VOLUME VOLUME CONTROL CONTROL AND LAMP Figure 4-6. 420 Speakerphone Voice Terminal 4-17 ...
AT&T 1987 AT&T - page 353

TABLE 4-D. Model 2500 Series Voice Terminal Adjuncts Adjunct 2500DMGC 2500MMGB 2500SM 2514 BMW 2554BM 4A Speakerphone x 55A1 Ground x x x x x Start Key AT&T Answer-Record x x x x x 2500 or Code-A-Phone 2540 (Answering Machine) Z34A Message x x x x Waiting Indicator Single-Line Voice Terminal Connection Information Single-line voice terminal con ...
AT&T 1987 AT&T - page 354

Multiline Voice Terminals The system supports MET (10- and 12-button only) and MERLIN (7300H Series) multiline voice terminals. Multiline voice terminals have two LEDs located beside each assignable button (except for the 34-button basic set). The LEDs are referred toas I-Use (red) and Status (green) LEDs. Additional information on the LEDs is prov ...
AT&T 1987 AT&T - page 355

5-Button Voice Terminal (7302H01D) PEC 3160-111 The 5-Button Terminal (Figure 4-7) can be desk or wall mounted and is about 5-3/4 inches wide, 5-1/4 inches high, and 8-1/2 inches long. The set comes equipped with the following: ● Handse t ● Touch Dial Pad (not DTMF) ● I-Use and Status LEDs ● Test/Program Switch — T—Used to test the oper ...
AT&T 1987 AT&T - page 356

I-USE/STATUS LEDs HANDSET SYSTEM ACCESS TEST/PROGRAM PROGRAMMABLE SWITCH FEATURE BUTTONS ❑ CONFERENCE ❑ SPEAKER/RING TRANSFER HOLD ❑ DROP ❑ VOLUME CONTROL SWTICH TOUCH DIAL PAD RECALL SPEAKER Figure 4-7. 5-Button Voice Terminal (7302 HOlD) 4-21 ...
AT&T 1987 AT&T - page 357

10-Button Voice Terminal (7303H01D) PEC 3161-172 The 10-Button Terminal (Figure 4-8) can be desk or wall mounted and is about 7 inches wide, 5-1/4 inches high, and 8-1/2 inches long. The set comes equipped with the following: ● Handse t ● Touch Dial Pad (not DTMF) ● I-Use and Status LEDs ● Test/Program Switch (two positions) — T–Used to ...
AT&T 1987 AT&T - page 358

I-USE/STATUS LEDs SYSTEM ACCESS (2) PROGRAMMABLE FEATURE BUTTONS (3) TEST/PROGRAM SWITCH PROGRAMMABLE FEATURE HANDSET BUTTONS (5) ❑ CONFERENCE ❑ TRANSFER TOUCH DIAL PAD ❑ DROP ❑ HOLD SPEAKER/RING VOLUME CONTROL SWITCH SPEAKER RECALL MESSAGE Figure 4-8. 10-Button Voice Terminal (7303HO1D) 4-23 ...
AT&T 1987 AT&T - page 359

34-Button Voice Terminal (7305H01D) (MD) PEC 3162-412 The 34-Button Terminal (Figure 4-9) can be desk or wall mounted and is about 10-1/4 inches, 5-1/2 inches high, and 8-1/2 inches long. This set is available only on a reuse basis and is not orderable via the Delivery Operation Support System (DOSS) Configurator. The set comes equipped with the fo ...
AT&T 1987 AT&T - page 360

I-USE/STATUS LEDs SYSTEM ACCESS (2) HANDSET PROGRAMMABLE FEATURE BUTTONS (3) TEST/PROGRAM SWITCH TOUCH DIAL PAD SPEAKER/RING VOLUME CONTROL SWITCH MESSAGE SPEAKER ❑ CONFERENCE ❑ TRANSFER RECALL ❑ DROP ❑ HOLD PROGRAMMABLE FEATURE BUTTONS (29) Figure 4-9. 34-Button Voice Terminal (7305HO1D) (MD) 4-25 ...
AT&T 1987 AT&T - page 361

34-Button Deluxe Voice Terminal (7305H02D) PEC 3162-417 The 34-Button Deluxe terminal (Figure 4-10) is available for general use and as a Direct Trunk Attendant Console. The voice terminal is about 10-1/4 inches wide, 5-l/2 inches high, and 8-1/2 inches long. It comes equipped with the following: ● Handse t ● Touch Dial Pad (not DTMF) ● I-Use ...
AT&T 1987 AT&T - page 362

default assignments. † On the primary Attendant Console, the first of the Direct Facility (Pooled) Access buttons defaults to loop-start trunks, the second to ground-start trunks, and the third to tie trunks. For any trunk type not assigned in the system, the associated button does not receive a default assignment. On the secondary Console, these ...
AT&T 1987 AT&T - page 363

Built-In Speakerphone (BIS) Voice Terminal (7305H03B) PEC 3162-BIS The BIS voice terminal (Figure 4-10) can be desk or wall mounted and is about 9-1/2 inches wide, 5-1/4 inches high, and 9-1/4 inches long. The set comes equipped with the following: ● Handset ● Touch Dial Pad (not DTMF) ● I-Use and Status LEDs ● Test/Program Switch (two posi ...
AT&T 1987 AT&T - page 364

HANDSET I-USE/STATUS LEDs SYSTEM ACCESS (2) PROGRAMMABLE FEATURE BUTTONS (3) TEST/PROGRAM SWITCH TOUCH DIAL PAD SPEAKER/RING VOLUME CONTROL SWITCH PROGRAMMABLE FEATURE BUTTONS (29) SPEAKERPHONE VOLUME CONTROL RECALL HFAI MESSAGE MICROPHONE SPEAKERPHONE CONFERENCE ❑ TRANSFER ❑ DROP ❑ HOLD ❑ Figure 4-11. BIS Voice Terminal (7305H03B) 4-29 ...
AT&T 1987 AT&T - page 365

Built-In Speakerphone (BIS) Voice Terminal With Display (7305H04C) PEC 3162- DIS (V2 only) The BIS Voice Terminal with Display (Figure 4-12) is available for general use and as a Switched Looped Attendant Console (SLAC). In general use, it can be desk or wall mounted; as a console it is normally desk mounted. The terminal is about 9-1/2 inches wide ...
AT&T 1987 AT&T - page 366

For Use as a Switched Loop Attendant Console: — Five predefined as loop buttons — Twelve other predefined (Inspect, Attendant Message Waiting, Alarm, Local, Scroll, Forced Release, Start, Source, Release, Destination, Cancel, Join) — Seventeen programmable (defaulted as Flex DSS [15], Position Busy [1], and Last Number Dialed [1]) Note: The p ...
AT&T 1987 AT&T - page 367

Hands-Free-Answer On Intercom (HFAI) Voice Terminal (7309H01B) PEC 3161-161 The HFAI voice terminal (Figure 4-13) can be desk or wall mounted and is about 6-1/4 inches wide, 5-1/4 inches high, and 9 inches long. The set comes equipped with the following: ● Handset ● Touch dial pad (not DTMF) ● I-Use and Status LEDs ● Test/Program Switch (tw ...
AT&T 1987 AT&T - page 368

I-USE/STATUS LEDs HANDSET SYSTEM ACCESS (2) TEST/PROGRAM SWITCH PROGRAMMABLE FEATURE BUTTONS (3) TOUCH DIAL PAD PROGRAMMABLE FEATURE BUTTONS (5) SPEAKER/RING VOLUME CONTROL SWITCH CONFERENCE ❑ TRANSFER ❑ DROP ❑ HOLD ❑ MESSAGE ❑ HFAI MICROPHONE ❑ RECALL ❑ SPEAKER ❑ Figure 4-13. HFAI Voice Terminal (7309HO1B) 4-33 ...
AT&T 1987 AT&T - page 369

Ten Button Multibutton Electronic Telephone (MET) (2991 C/D05) The Ten Button MET set (Figure 4-14) may be desk or wall mounted. This set is available only on a reuse basis and is not orderable via the Delivery Operation Support System (DOSS) Configurator. The set comes equipped with the following: ● Handset ● Touch-Tone Dial Pad (DTMF) ● I-U ...
AT&T 1987 AT&T - page 370

TOUCH TONE DIAL PAD HANDSET RECALL INDICATOR BUTTON LAMPS SYSTEM ACCESS PROGRAMMABLE FEATURE BUTTONS MESSAGE WAITING DROP CONFERENCE TRANSFER HOLD Figure 4-14. Ten Button MET Set (2991C05) 4-35 ...
AT&T 1987 AT&T - page 371

Ten Button MET With Built-In Speakerphone (2993C04) The 10-Button MET set with BIS (Figure 4-15) can be desk or wall mounted. This set is available only on a reuse basis and is not orderable via the Delivery Operation Support Systcrn (DOSS) Configurator. The set comes equipped with the following: ● Handset ● Touch dial pad (DTMF) ● I-Use and ...
AT&T 1987 AT&T - page 372

TOUCH TONE DIAL PAD SYSTEM ACCESS PROGRAMMABLE FEATURE BUTTONS HANDSET ON/QUIET BUTTON ON LAMP SPEAKERPHONE OFF BUTTON VOLUME RECALL INDICATOR CONTROL BUTTON LAMPS / ❑ MESSAGE WAITING ❑ DROP ❑ CONFERENCE ❑ TRANSFER ❑ HOLD Figure 4-15. Ten Button MET With Built-In Speakerphone (2993C04) 4-37 ...
AT&T 1987 AT&T - page 373

Twelve Button MET Set (7203M) The 12-Button MET set (Figure 4-16) is a freestanding voice terminal. This set is available only on a reuse basis and is not orderable via the Delivery Operation Support System (DOSS) Configuator. The set comes equipped with the following: ● Handset ● Touch-Tone Dial Pad (DTMF) ● I-Use and Status LEDs ● Tone Ri ...
AT&T 1987 AT&T - page 374

❑ HOLD I-USE/STATUS LEDS ❑ TRANSFER ❑ CONFERENCE ❑ DROP ❑ MESSAGE HANDSET TOUCH TONE DIAL PAD TONE RINGER VOLUME CONTROL DISCONNECT RECALL ❑ (PROGRAMMABLE) ❑ (PROGRAMMABLE) ❑ (PROGRAMMABLE) ❑ SYSTEM ACCESS ❑ SYSTEM ACCESS Figure 4-16. Twelve Button MET Set (7203M) 4-39 ...
AT&T 1987 AT&T - page 375

Multiline Voice Terminal Connection Information Detailed connection information is provided in the following figures: ● Figure 4-24—On-Premises 7300H Series Multiline Voice Terminal Connections ● Figure 4-25—Off-Premises 7300H Series Multiline Voice Terminal Connections ● Figure 4-26—Ten Button MET Set Connections ● Figure 4-27—Stan ...
AT&T 1987 AT&T - page 376

Voice Terminal Adjunct Connection Information Detailed adjunct connection information is provided in Section 2 with the detailed feature descriptions of the headset adapter and speakerphone adjuncts. Descriptions of the Station Interconnect Panel (SIP), Trunk Access Equipment (TAE), and associated cables and adapters, as shown on the figures, are p ...
AT&T 1987 AT&T - page 377

Asynchronous Data Units (AD US) Asynchronous Data Units, and Multiple Asynchronous Data Units (MADUs), provide an interface between ports on the TN726 Data Line CP and RS-232C Data Terminal Equipment (DTE) or Data Communications Equipment (DCE). The DTE is equipment that provides a data source, termination, or both—a host computer, printer, or a ...
AT&T 1987 AT&T - page 378

RS-232C CONNECTOR INTERFACE TELEPHONE JACK WALL JACK OPTIONAL ORIGINATE/DISCONNECT SWITCH Figure 4-17. Asynchronous Data Unit (ADU) ADU Connection Information Detailed connection information is provided in the following figures: ● ● ● ● Figure 4-28—Typical ADU Connections Supporting Data Terminal And Single-Line Voice Terminal Figure 4-29 ...
AT&T 1987 AT&T - page 379

TABLE 4-F. Asynchronous Data Units UNIT PEC FEATURE Z3A1 2169-001 3-foot plug-ended EIA connector and mod jack for single-line set. Z3A2 2169-002 EIA plug and mod jack for single-line set. Z3A4 2169-004 3-foot receptacle-ended EIA cord and mod jack for single-line set. Z3A5 62506 3-foot plug-ended EIA connector and mod jack for hybrid set . Require ...
AT&T 1987 AT&T - page 380

Peripheral Equipment Peripheral Equipment is equipment that connects to the Call Processor (ZTN82 or ZTN128) CP, including: ● ● ● System Administration Terminal (SAT); refer to “System Administration” in section 2. Digital Tape Unit (DTU); refer to “Digital Tape Unit” in Section 2. Station Message Detail Recording (SMDR) printer or Ca ...
AT&T 1987 AT&T - page 381

AC Power Line Surge Suppressor The TII Model 428 Self-Restoring Powerline Surge Suppressor (PEC 8310-001, Comcode 402988950) protects against electrical surges, spikes, and transients that can cause damage to the System 25 power supply. A pilot light indicates that full protection is present. The unit plugs directly into a standard 120-volt 15-amp ...
AT&T 1987 AT&T - page 382

trunk CPs (except Tie Trunk CPs) can be connected to a three-way splitter cable (OR6016) that concentrates the CP interfaces into one 25-pair cable. Up to two Tie Trunk CPs can be connected to a two-way splitter cable (OR6015) that concentrates the CP interfaces into one 25-pair cable. Each splitter cable connects to an interface block at the TAE. ...
AT&T 1987 AT&T - page 383

Station Interconnect Panel (SIP) The Station Interconnect Panel (SIP) provides for the connection of the terminals (voice and data), peripheral equipment, and some auxiliary equipment of the system to station port CPs. This equipment includes voice terminals, attendant consoles, data terminals, System Administration Terminal, Digital Tape Unit, and ...
AT&T 1987 AT&T - page 384

NOT E MODULAR JACK ROW NUMBE R 28 1/16” PURS E LOC K CLI P ADAPTER MOUNTING CLIP BUILDING WIRING RING COLUMN LETTER BOX NOTE 10” WIDE, 9 1/2” MOUNTING OCTOPUS CABLE CENTERS WHEN FLANGES DISTRIBUTION POST ARE OVERLAPPED Figure 4-19. 617A Station Interconnect Panel 4-49 ...
AT&T 1987 AT&T - page 385

Figure 4-20 shows voice terminal connections to the system cabinets via the SIP. Typically, voice terminals are plugged into modular wall jacks that provide a cut-down block for building wiring. At the SIP, 858A Adapters provide a cut-down point for 4-pair wire runs. An octopus cable (WP90780) from a station CP provides 25-pair connectorized cablin ...
AT&T 1987 AT&T - page 386

Connectivity Figures Figures 4-21 through 4-31 provide connection information for various equipment. These figures have been included as an aid to understanding how equipment can be connected to System 25 and to indicate required connecting and supporting equipment. Other arrangements are possible ; these figure s can be useful in developing connec ...
AT&T 1987 AT&T - page 387

SYSTEM 25 CABINET PART OF OCTOPUS PART OF CABLE SIP ZTN78 —— — SINGLE-LINE C2 SIP W1 C5 OR VOICE ● B1 TN742 ADAPT. TERMINAL —— — (NOTE) —— — —— — LEGEND: ZTN78 – TIP RING CP TN742 – ANALOG LINE CP NOTE : B 1 – TYPICAL-103A CONNECTING BLOCK* C2 - OCTOPUS CABLE (WP90780) - PEC 2720-05P C5 – MODULAR CORD (D4BU-87) FUR ...
AT&T 1987 AT&T - page 388

SYSTEM 25 PART OF CABINET OCTOPUS CABLE EXPOSED CABLE —— — TN742 —— — ANALOG C2 SIP W1 D1 D1 ● ADAPT. LINE CP —— — —— — G G —— — SINGLE-LINE VOICE C5 TERMINAL B1 (NOTE) LEGEND : B1 – TYPICAL – 103A CONNECTING BLOCK C2 - OCTOPUS CABLE (WP90780) C 5 - MODULAR CORD (D4BU-87) - FURNISHED WITH SET D1 - STANDARD GAS TU ...
AT&T 1987 AT&T - page 389

PART OF TAE SYSTEM 25 PART OF 700A NETWORK CABINET OCTOPUS INTERFACE BLOCK CABLE (110- OR 66-TYPE) —— — PART OF NETWORK TN742 ANALOG LINE CP —— — SIP INTERFACE C2 SIP W1 A ● ADAPT. RJ21X —— — —— — OPS SINGLE-LINE CENTRAL VOICE TERMINAL OFFICE LEGEND : A – SINGLE-ENDED 25 PAIR CABLE (A25D)* C2 – OCTOPUS CABLE (WP90780) ...
AT&T 1987 AT&T - page 390

SYSTEM 25 PART OF CABINET OCTOPUS CABLE —— — PART OF —— — SIP ZTN79 C2 ● SIP W1 B1 VOICE ATL ADAPT . TERMINAL LINE CP __ _ T1 —— — TYPICAL-103A CONNECTING BLOCK* MODULAR CORD (D8W-87) - FURNISHED WITH SET OCTOPUS CABLE (WP90780) - PEC 2720-05P 7300H TYPE VOICE TERMINAL 4 PAIR INSIDE WIRING CABLE* LEGEND : E1 – C1 – C2 – T1 ...
AT&T 1987 AT&T - page 391

SYSTEM 25 CABINET ZTN79 ATL LINE CP PART OF EXPOSED CABLE OCTOPUS CABLE ——— — I ● PART OF SIP IROB IROB ——— — C2 SIP C1 PROTECTION PROTECTION ADAPT TII 341 TII 341 ——— — (NOTE 1) (NOTE 1) ——— — W1 ——— — LEGEND : B1 – TYPICAL-103A CONNECTING BLOCK* C1 – MODULAR CORD (D8W-87) - FURNISHED WITH SET C2 – O ...
AT&T 1987 AT&T - page 392

SYSTEM 25 CABINET PART OF OCTOPUS CABLE PART OF SIP TN735 —— — W1 400B2 MET C2 SIP ● C1/C9 MET ADAPT. B1 ADAPT SET LINE CP —— — —— — C7 —— — 248B ADAPT 2012D TRANS LEGEND : B1 – TYPICAL-103A CONNECTING BLOCK* C1 – MODULAR CORD (D8W-87) - FURNISHED WITH SET C2 - OCTOPUS CABLE CABLE (WP90780) - PEC 2720-05P C9 – MODULA ...
AT&T 1987 AT&T - page 393

SYSTEM 25 PART OF CABINET OCTOPUS CABLE PART OF —— — SIP ZTN79 —— — C2 451A Z400F C1 HYBRID ● SIP ADAPT. ADAPT. ADAPT. LINE CP —— — —— — C7 W1 MBPS P2 7300H SERIES C1 VOICE B1 TERMINAL LEGEND: B 1 – TYPICAL - 103A CONNECTING BLOCK C 1 – MODULAR CORD (D8W-87) C 2 - OCTOPUS CABLE (WP90780) C7 – MODULAR CORD (D6AP-87) P ...
AT&T 1987 AT&T - page 394

SYSTEM 25 PART OF CABINET OCTOPUS CABLE PART OF SIP —— — ZTN78 C2 OR ● TN742 —— — ADAPT SIP M1 Z3A1 —— — B1 (WP90851-L1) ADAPT ADU —— — TN726 C2 ● —— — RSS232 —— — TERMINAL LEGEND : ZTN78 - TIP RING LINE CP TN742 - ANALOG LINE CP SINGLE- TN726 - DATA LINE CP LINE SET B1 - TYPICAL - 103A CONNECTING BLOCK * (NO ...
AT&T 1987 AT&T - page 395

SYSTEM 25 PART OF CABINET OCTOPUS CABLE PART OF SIP —— — ZTN79 C2 ATL ● LINE CP —— — Y ADAPT — — — (WP90851-L1) TN726 —— — W1 B1 DATA C2 ● LINE CP —— — —— — RSS232 LEGEND : WP90851-L1 - E1 - C1 - C2 - PI - WI - Z3A5 ADU - SIP ADAPT. Z3A5 ADU -48V DC P1 MODULAR Y ADAPTER - PEC 2750-T05 TERMINAL TYPICAL - 103A ...
AT&T 1987 AT&T - page 396

SYSTEM 25 CABINET TN726 MADU C10 W2 C11/C12 HOST COMPUTER OR TERMINALS LEGEND : TN726 – DATA LINE CP MADU – MULTIPLE ASYNCHRONOUS DATA UNIT (PEC 2169-005) SINGLE UNIT ASSEMBLY (8 ADU PORTS) W2 – BUILDING WIRING (25-PAIR CABLE) C1O – 25-PAIR CENTERFEED-TO-ENDFEED CABLE (PEC 2724-78B) (ALWAYS REQUIRED) Cll – M48C OCTOPUS CABLE (PEC 2724-29G ...
AT&T 1987 AT&T - page 397

TO RS-232C DEVICE OPTIONAL SINGLE-LINE AC POWER OUTLET 2012D POWER TRANSFORMER 400B2 ADAPTER WALL JACK 248B ADAPTER D6AP-87 CORD 4-PAIR D8W CORD (PEC 2725-07G) D8AM-87 CROSSOVER CORD (REQUIRED IF THIS ADU IS CONNECTED TO ANOTHER ADU OR ANY OTHER DCE DEVICE, RATHER THAN DLC) NOTE : PEC 21691 includes 2012D transformer, 248B and 400B2 adapters and D6 ...
AT&T 1987 AT&T - page 398

SECTION 5—TECHNICAL SPECIFICATIONS This section provides information on the technical characteristics and capacities of the system. Some items covered here are discussed elsewhere in the manual but are repeated here for ease of reference. Technical specifications are provided for: ● Hardware and Software Parameters ● Unit Loads ● Cable Dist ...
AT&T 1987 AT&T - page 399

Hardware And Software Parameters The following is a listing of maximums for hardware and software parameters. ITEM TOTAL Attendant Consoles Direct Trunk Termination 2 Direct Extension Selector 2 Automatic Route Selection (ARS): Patterns 8 Subpatterns Per Pattern 2 Routes Per Subpattern 3 Facility Restriction Levels 4 Cabinets 3 Circuit Packs: Commo ...
AT&T 1987 AT&T - page 400

Hardware And Software Parameters (Contd) ITEM TOTAL Direct Group Calling (DGC) Groups 32 Members per group 10 Emergency Transfer Units (ETUs) 4 Voice Terminals per ETU 5 Modem Pool Circuit Packs per cabinet 2 Conversion Resources per circuit pack 2 Paging Zones 3 Parked Calls (System ) 24 Per Voice Terminal 1 Attendant DXS Console 8 Trunk Groups 16 ...
AT&T 1987 AT&T - page 401

Hardware And Software Parameters (Contd) ITEM TOTAL Traffic Data ● Simultaneous 2-Party Conversations 115 ● Call Capacity –CCS/Hou r 4140 –Busy Hour Call Capacity 2500 Reliability ● Mean Time Between Outages (MTBO) 4 Years Power Consumption ● Per Cabinet, Maximum 500 Watts ● Thermal Dissipation 1700 BTU/Hour Total Ports - also include ...
AT&T 1987 AT&T - page 402

Unit Loads A cabinet can supply no more than 80 unit loads of 48 volt power (a unit load is defined as 44 mA). Unit loading is determined by the terminal connected to the port circuits. The following table lists unit loads for various terminals. UNIT LOADS (Note) EQUIPMENT CIRCUIT UNIT LOAD PACK PER PORT 2500 Voice Terminals ZTN78 0.5 7101A Voice T ...
AT&T 1987 AT&T - page 403

Cable Distance Limitations The following specifications provide allowable cabling distances for the following devices: ● Single-Line Voice Terminals ● Multiline Voice Terminals ● Data Terminals (RS-232) Connected to Asynchronous Data Units (ADUs). Single-Line Voice Terminals SUPPORTING 24-GAUGE WIRE CIRCUIT (0.5106 mm) PACK FEET METERS ZTN78 ...
AT&T 1987 AT&T - page 404

Multiline Voice Terminals SUPPORTING CIRCUIT PACK ZTN79 (7300H Series– in-building or out-of-building, no off-premises) 24-GAUGE WIRE (0.5106mm) FEET 2,000 (Note) METERS 610 TN735 (in-building MET Sets only ) 1,000 305 Note: Requires local power beyond 1,000 feet. IN-BUILDING 7300H SERIES < 2000 FEET ZTN79 VOICE TERMINALS ATL LINE CP OUT-OF-BU ...
AT&T 1987 AT&T - page 405

Data Terminals (RS-232) Connected To Asynchronous Data Units DATA RATE ● 300 bps ● 1,200 bps ● 2,000 bps ● 4,800 bps ● 9600 bps ● 19,200 bps 24-GAUGE WIRE (0.5106 mm) FEET 40,000 20,000 12,000 7,000 5,000 2,000 METERS 12,200 6,096 3,657 2,133 1,524 610 DISTANCE (SEE TABLE) ZTN82 OR RS-232C ADU ZTN128 DEVICE ADU CALL (ASYNCHRONOUS) PROCE ...
AT&T 1987 AT&T - page 406

Tones The following call progress tones are generated by the system: TONE FREQUENCY PATTERN (In Milliseconds) Busy Tone 480 Hz + 620 Hz 500 on, 500 off; repeated Confirmation Tone 350 HZ + 440 HZ 100 on, 100 off, l00 on, l00 off, l00 on followed by silence Dial Tone 350 HZ + 440 HZ Continuous Reorder Tone 480 Hz + 620 Hz 250 on, 250 off; repeated R ...
AT&T 1987 AT&T - page 407

Port Specifications The following tables provides interface specifications for System 25 line and trunk port circuits: supported by System 25: DATA TERMINAL PORTS (Note) STATION TYPE CIRCUIT PACK DATA TERMINAL SPECIFICATIONS EIA RS-232 Device Via Data Line RS-232 device must furnish signals on ADU ADU (TN726) pins 2 (TD) and 20 (DTR) and ground on ...
AT&T 1987 AT&T - page 408

Port Specifications (Contd) DATA TERMINALS (Do Not Require Local Power) DATA REQUIRES Z3A1 REQUIRES TERMINAL or Z3A2 ADU Z3A4 ADU AT&T 4410 X 4415 X 51OA X ADMs 3A X 31 X ADDS Viewpoint * X ConCept HDS 108 X Datamedia Elite 1521 X Hazeltine 1510 X Hewlett Packard 2621A X 2623A X 2640 X 2645 X 2645A X Teletype BLIT/1 (68000 based) X 5620 (MAC-80 ...
AT&T 1987 AT&T - page 409

Port Specifications (Contd) VOICE TERMINAL PORTS STATION TYPE CIRCUIT PACK SPECIFICATIONS Tip and Ring Tip Ring Line Single-Line Sets (ZTN78) ● l-Pair Interface (Tip and Ring) (Analog) ● Analog signals modulated over DC loop ● Loop Voltage: 24 V dc ● Signaling: Dual Tone Multifrequency (DTMF) only ● REN (max.): 1.2 ● DC Current (max.): ...
AT&T 1987 AT&T - page 410

Port Specifications (Contd) VOICE TERMINAL PORTS (Contd) STATION TYPE CIRCUIT PACK SPECIFICATIONS MET Sets MET Line (Hybrid) (TN735) ● 3-Pair Interface l-Voice pair 2-Control pairs ● Analog Voice, Digital Control/Signaling ● Power: Phantom Power Over Data Pairs ● Bipolar Signaling With O V de Offset ● 1 MHz Nominal Signaling Rate ● Loop ...
AT&T 1987 AT&T - page 411

Port Specifications (Contd) TRUNK PORTS TRUNK TYPE CIRCUIT PACK SPECIFICATIONS Auxiliary Trunk TN763 ● Capacity: 4 Circuits ● 3-pair interface: Voice (T,R), Signaling (S, S1), Status (SZ, SZ1) Direct Inward TN753 ● Capacity: 8 Circuits Dialing (DID) Trunk ● 2-Wire (600 Ohm Fixed Impedance) Transmission ● Signaling: Wink Start, Delay Dial, ...
AT&T 1987 AT&T - page 412

Port Specifications (Contd) TRUNK PORTS TRUNK TYPE CIRCUIT PACK SPECIFICATIONS Ground Start ZTN76 ● Capacity: 8 Circuits Trunk ● 2-Wire (600 Ohms or RC Balance) Transmission ● Network Signaling: Ground Star t ● Two-way or Incoming only Service Loop Start ZTN77 ● Capacity: 8 Circuits Trunk ● 2-Wire (600 Ohms or RC Balance) Transmission ? ...
AT&T 1987 AT&T - page 413

Recommended Central Office Trunk Facilities The following table provides recommendations for CO trunks based on the number of voice terminals in the system and the calling traffic. CALLING TRAFFIC VOICE LIGHT MEDIUM HEAVY TERMINALS TRAFFIC TRAFFIC TRAFFIC 20 3/3 4/4 5/5 25 3/4 5/5 6/6 30 4/4 6/5 8/7 40 4/4 6/6 9/8 50 5/4 ‘7/6 10/8 60 5/4 8/7 11/9 ...
AT&T 1987 AT&T - page 414

Analog Transmission Characteristics Frequency Response: (Station-To-Station or Station-To-CO-Trunk, relative to loss at 1 kHz) FREQUENCY 60 Hz 200 Hz 300-3000 Hz 3200 Hz 3400 Hz Insertion Loss: LOSS >20 dB <5 dB <1 dB <1.5 dB <3 dB CONNECTION TYPE LOSS Standard Station to Standard Station 6 dB Standard Station to Extended/Off-Premise ...
AT&T 1987 AT&T - page 415

Analog Transmission Characteristics (Contd) Sampling Rate: 8 kHz Terminating Impedance: 600 ohms Trunk Balance Impedance: 600 ohms or Complex Z (selectable) Echo Return Loss: The echo return loss of the switching equipment is infinite. The echo return loss of the station equipment can be engineered for greater than 18 db over the range of 500 Hz to ...
AT&T 1987 AT&T - page 416

SECTION 6—ENVIRONMENTAL REQUIREMENTS This section provides information on floor and wall space requirements for System 25 cabinets and associated peripheral equipment. Also included are specifications for temperature, humidity, air purity, lighting, electrical noise (RFI) suppression, power, grounding and lightning protection. Floor Plans And Lay ...
AT&T 1987 AT&T - page 417

SYSTEM CABINETS (FOOTPRINT) FRONT NOTE 3 BACKBOARD TERMINATION FIELD (NOTE 4) TABLE NOTES : 1. 115V AC, 60 Hz, 15 AMP OUTLETS (HUBBELL 5262 OR EQUIVALENT) MUST BE LOCATED WITHIN SIX FEET (1.8 m) OF SYSTEM CABINETS. 2. MULTIPLE CABINET SYSTEMS REQUIRE TWO QUAD OUTLETS, SINGLE CABINET SYSTEMS REQUIRE ONE QUAD OUTLET. 3. ALLOW AT LEAST 24 INCHES OF SP ...
AT&T 1987 AT&T - page 418

QUAD AC OUTLETS Figure 6-2. Typical System 25 Equipment Area Elevation Plan 6- 3 ...
AT&T 1987 AT&T - page 419

Table Top Space The following system equipment requires (customer provided) table top space in the equipment area: ● System Cabinets - Each cabinet is 13 inches high, 17 inches wide, and 21 inches deep. A three cabinet system requires a vertical space of approximately 40 inches and a 17 inch by 21 inch table top space. Each cabinet weighs approxi ...
AT&T 1987 AT&T - page 420

Air Purity The cabinet should not be installed in an area where the air may be contaminated with any of the following: ● Excessive dust, lint, carbon particles, paper fiber contaminants, or metalli c contaminants ● Contaminants expelled by office copying machines ● Highly corrosive atmosphere within an enclosed area or atmosphere containing v ...
AT&T 1987 AT&T - page 421

AC Power Requirements ● The System 25 power service shall be a dedicated branch circuit with no other equipment served (See Figure 6-3. ) ● Each cabinet requires 500 Watts at 115V ac (maximum) ● Provide a load center of appropriate current rating (ITE EQ4 typical) equipped with 120V ac, 15 ampere (AMP), single pole magnetic circuit breaker(s) ...
AT&T 1987 AT&T - page 422

TWO SEPARATELY FUSEO 15 AMP CIRCUITS ITE: QP1 - B015 TWO 15 AMP CKT BAKA OR APPROVED EQUIVALENT NEUTRAL INSULATED FROM LOAD ENTER LOAD CENTER SINGLE POINT / TO 240 VAC 30 AMP. SINGLE PHASE MAIN GROUND (GREEN) 4“ BOX (RACO 230 OR EQUIVALENT) HUBBELL RECPTS. (5262 15 AMP OR EQUIVALENT) 4“ COVER (RACO 807 OR EQUIVALENT) GROUND APPROVED GROUND BA ...
AT&T 1987 AT&T - page 423

Grounding Connection of an approved ground to the system cabinets is essential. An approved ground may consist of any of the following: ● Grounded Building Steel - The metal frame of the building. ● Water Pipe - A continuous metal water pipe, not less than l/2 inch in diameter, that is connected to an underground metal water pipe that is in dir ...
AT&T 1987 AT&T - page 424

SECTION 7—PARTS INFORMATION This section contains information that may assist you in cross referencing Apparatus Codes, Comcodes and Price Element Codes (PECs). The first table is grouped by descriptive Price Element Codes (PEC). The second table is arranged by component codes (COMCODE). Parts Listed by PEC PEC DESCRIPTION APPARATUS CODE COMCODE ...
AT&T 1987 AT&T - page 425

PEC DESCRIPTION APPARATUS CODE 62502 62503 62504 62505 62506 Part of: 62506 62506 62507 62508 62509 Part of: 62509 62509 62509 62509 62510 Part of: 62510 62510 62510 62511 Part of: 62511 62511 62512 Part of: 62512 62512 62512 62512 GS Trunk CP LS Trunk CP TR Line CP ATL Line CP Asynchronous Data Unit Digital Tape Unit System Admin Terminal (SAT) Di ...
AT&T 1987 AT&T - page 426

COMCODE PEC 62513 Part of: 62513 62513 62513 62514 Part of: 62514 62514 62515 Part of: 62515 62515 62515 62515 62515 62515 62515 62515 62515 62515 62518 62519 Part of: 62519 62519 62519 62519 62520 Part of: 62520 62520 62520 63111† 63112† 63116† 63117† DESCRIPTION APPARATUS CODE MOH Interface D181575 includes * 105143186 102600517 103558916 ...
AT&T 1987 AT&T - page 427

PEC 63118† 63119† 63123† 63130† 1020-S90 1020-S91 1203-020 2169-001 2169-004 21691 Part of: 21691 21691 21691 2301-SAA 2610-001 2614-100 2720-05P 2720-05X 2720-06X 2724-30C 2724-38X 2725-07G 2725-075 DESCRIPTION APPARATUS CODE COMCODE Aux Trunk CP TN763 Pooled Modem CP TN758 Tone Detector CP TN748 Data Line CP TN726 ACCESS Software * CAM So ...
AT&T 1987 AT&T - page 428

PEC DESCRIPTION APPARATUS CODE COMCODE 2750-A24 2750-A25 2750-T05 2781-JDX 2782-JA1 2782-JA2 2782-JC1 2783-JDX 3100-1TD 3100-TWR 3178-SYS * 3100-2TD 3100-ORD 3100-ORW 3100-2RD * 1121-050 1140-010 Mod/RS232 Adapt, Male Mod/RS232 Adapt, Female Voice/Data (Y) Adapter System Wiring-Time and Materials (New) System Wiring Run, Firm Price (Reuse) System W ...
AT&T 1987 AT&T - page 429

PE C DESCRIPTION APPARATUS CODE COMCODE 3141-BIS Part of: 3141-BIS 3141-BIS 3143-12M 3160-111 (MAC30 Att) 3161-172 (MAC30 Att) 3161-161 3162-412 3162-417 (MAC30 Att) 3162-BIS 3162-DIS 3163-HFU 3164-HFA 31710 3170-00M 31017 31019 :310:32 31760 31761 32918 MET Set-BIS Transformer Kit of Parts 12-Button MET VT 5-Button MERLIN VT 10-Button MERLIN VT ME ...
AT&T 1987 AT&T - page 430

PEC DESCRIPTION APPARATUS CODE COMCODE 8310-001 AC Power Surge 402988950 Suppressor TII Model 428 Miscellaneous No PEC Fanning Strip 50A 105196604 No PEC Block, Connector 110 Female 103756334 No PEC Block, Connector 157B Female 403613003 No PEC Cable Conn (15’ DE) A25D 100963990 No PEC Block, Connector 103A 103104220 No PEC Block, Connector 104A ...
AT&T 1987 AT&T - page 431

Parts Listed by COMCODE Throughout the following table, “part of” is abbreviated as “P/O.” COMCODE PEC DESCRIPTION APPARATUS CODE 100009968 P/O 62511 Auxiliary Trunk Block Conn 66E3-25 Interface P/O 62514 10B ETU (2) B25A Cables DE 100017334 P/O 62511 Auxiliary Trunk Cable B25A 15/DE Interface 100287085 31017 Ground Start Key 55A1 100963990 ...
AT&T 1987 AT&T - page 432

COMCOD E PEC DESCRIPTION APPARATUS CODE 103557062 103557112 103557161 103558916 103756334 103786786 103786802 103786828 103810586 103814356 103823555 103842050 103843538 103848859 103870267 103870416 103871018 103871109 103871844 63116† DID Trunk CP TN753 TN758 TN763 36A Voice Coupler 110 Female D8W-87 Cord (7 ft) D8W-87Cord (14 ft) D8W-87Cord (1 ...
AT&T 1987 AT&T - page 433

COMCOD E PE C DESCRIPTION APPARATUS CODE 103881421 103942146 103942857 103963310 103963963 103964185 103965232 103965240 103965257 103965265 103965281 103965299 103965315 103965323 103966255 103969424 103972907 103975349 103975645 103976163 103981965 2750-A17 3141-BIS P/O 62510 3143-12M 2169-001 2169-004 P/O 62515 62502 62503 62504 62505 P/O 6250-0 ...
AT&T 1987 AT&T - page 434

COMCODE PEC DESCRIPTION APPARATUS CODE 103981981 103982005 103982658 103982740 103984118 104010061 104152558 104154430 104174750 104174768 104246616 105012637 105012645 105031181 105105506 105105514 105105522 105105530 105291488 105196604 105211023 105212179 3162-DIS 3161-161 No PEC P/O 6250-011 62514 31710 P/O 62515 2724-38X P/O 62515 31761 31760 ...
AT&T 1987 AT&T - page 435

COMCODE 105335657 105339584 105341218 105341382 105355374 402988950 403242639 403613003 403836620 403864150 403954761 403957129 403961519 404079428 404079436 405010612 405010620 405177791 405193186 PEC 62519 1203-020 1020-S90 1020-S91 62520 8310-001 P/O 62509 P/O 62510 P/O 62512 P/O 62520 No PEC 2720-06X 2720-05X P/O 6250-011 P/O 6250-012 P/O 62501 ...
AT&T 1987 AT&T - page 436

COMCODE PEC DESCRIPTION APPARATUS CODE 405462904 P/O 62520 527840003 2610-001 527840102 2614-100 845412956 No PEC 845416379 P/O 6250-011 P/O 6250-012 P/O 62501 845416635 P/O 6250-011 P/O 6250-012 P/O 62501 845875155 P/O 6250-011 P/O 6250-012 STARLAN/ATL Interface KS-23475,L1 Adapter AT&T STARLAN NETWORK Network Extension Unit (NEU) AT&T STA ...
AT&T 1987 AT&T - page 437

SECTION 8—REFERENCE DOCUMENTATION System 25 is supported by a complete set of basic and supplementary documentation and optional software. This section provides a brief summary of the available material. Manuals not specified for Release 1 Version 2 (R1V2) cover both R1V1 and R1V2. Basic Manuals Administration Manual . . . . . . . . . . . . . . . ...
AT&T 1987 AT&T - page 438

Optional Software ● Advanced Administration Software Package ● Communications Access Manager Software Package ● AT&T STARLAN NETW0RK ACCESS Software Package Descriptions of Basic Manuals Administration Manual Provides the information necessary to initialize a system and to perform on-going system administration. Explains the operation of ...
AT&T 1987 AT&T - page 439

Planning Manual The document is a presale workbook used by the Account Team and customer to define a set of orderable equipment that will meet the customer’s specific requirements. This workbook, when completed, can be used in conjunction with the Quick-Quote Price Estimator or the DOSS Configurator to obtain a price estimate or formal quote or t ...
AT&T 1987 AT&T - page 440

SECTION 9—GLOSSARY This section provides explanations for acronyms and definitions of terms used in this manual. ADU: (Asynchronous Data Unit) ARS: (Automatic Route Selection) ASCII: (American Standard Code for Information Exchange) Administer To access and change the parameters associated with the services or features of the system. Analog Data ...
AT&T 1987 AT&T - page 441

Attendant Console ● Direct Trunk or Switched Loop Attendant Console: An electronic call-handling position with pushbutton control. Used by attendants to answer and place calls and to manage and monitor some system operations. ● Direct Extension Selector Console: Provides the attendant with a visual indication of the active or idle status of ext ...
AT&T 1987 AT&T - page 442

Bus, Time Division Multiplex See Time Division Multiplex Bus. CCS (Hundred Call Seconds) A traffic-measuring unit that expresses the load of one or more traffic-handling devices. A device used for 1 hour without interruption generates 36 CCS which equals 1 erlang (see Erlang). Call Appearance, Attendant Console Two buttons, labeled System Access, u ...
AT&T 1987 AT&T - page 443

Console See Attendant Console. Coverage Call A call that is redirected from the called party’s personal dial code to an alternate answering position when certain criteria are met. Coverage Path The order in which calls are redirected to alternate answering positions. Coverage Point The attendant positions (as a group), Direct Group Call (DGC) gro ...
AT&T 1987 AT&T - page 444

Data Module A data interface device (i.e., Asynchronous Data Unit) providing a standard interface between customer provided data equipment and a data port on the switch. Data Terminal Equipment (DTE) DTE refers to a specific RS-232C connector termination designed to connect directly to a DCE type connection. Typically associated with video display ...
AT&T 1987 AT&T - page 445

Facility (physical) A transmission channel to another switching system; to a Central Office for example. By application, examples are: ● CO Trunks ● FX Trunks ● WATS Trunks ● OCC Trunks ● Tie Trunks By technical type these include loop start, ground start, DID, automatic ringdown, etc. These facilities may be accessed by their facility ac ...
AT&T 1987 AT&T - page 446

Home Numbering Plan Area Code (HNPA) The local area code. The area code does not have to be dialed to call numbers within the local geographical area. Immediate-Start Tie Trunk After establishing a connection with the distant switching system for an outgoing call, the system waits a nominal 65 milliseconds before sending the digits of the called nu ...
AT&T 1987 AT&T - page 447

Modem Pooling Provides shared-use conversion resources that eliminate the need for a dedicated modem when an analog data end point accesses, or is accessed by, an analog line or trunk. Multifeature Single-Line Voice Terminal A terminal served by one tip and ring voice circuit and having additional buttons for activating features. Multilane Voice Te ...
AT&T 1987 AT&T - page 448

Parameter Any set of physical properties whose values determine the characteristics or behavior of something Peripheral Equipment System Administration Terminal (SAT), SMDR Output device such as a SMDR Printer or a Call Accounting System, Digital Tape Unit (DTU). Personal Dial Code Each system user is assigned a PDC and is allowed to “ login” t ...
AT&T 1987 AT&T - page 449

Protocol A set of conventions or rules governing the format and timing of message exchanges to control data movement and correction of errors. Public Network The network that can be openly accessed by all customers for local or long-distance calling. Queue An ordered sequence of calls waiting to be processed. Queuing The process of holding calls in ...
AT&T 1987 AT&T - page 450

Software A set of computer programs that accomplish one or more tasks. Split A condition whereby a caller is temporarily separated from a connection with the attendant. This split condition automatically occurs when the attendant, active on a call, presses the Start button. Status LED (lamp) A green LED or lamp that shows the status of a call appea ...
AT&T 1987 AT&T - page 451

Tie Trunk A telecommunications channel that directly connects two private switching systems. Time Division Multiplex Bus A special bus that is time shared by preallocating short time slots to each transmitter on a regular basis. In a PBX, all port circuits are connected to the time division multiplex bus permitting any port to send a signal to any ...
AT&T 1987 AT&T - page 452

Write Operation The processor putting information onto a storage medium such as magnetic tape. 800 Service A service that allows incoming calls from a certain area or areas to an assigned number for a flat-rate charge based on usage. 9-13 ...
AT&T 1987 AT&T - page 453

INDEX 500 Voice Terminals, 4-12 Auxiliary Equipment (Contd.) 55A1 Key, 4-40 Connections, 4-51 Auxiliary Trunk (TN763), 3-35 Abbreviated Alerting, 2-132 AC Power Requirements, 6-6 Access Equipment, Trunk, 4-46 Access, Dictation System, 2–118 Account Code Entry, 2-6 Accountability, Call, 2-61 Accounting, Call, 2-62 Acoustic Coupler, 4-40 Activating ...
AT&T 1987 AT&T - page 454

Connections, (Contd.) Peripheral Equipment, 4-51 Voice Terminal and Adjuncts, 4-51 Connectivity, 4-46 Figures, 4-51 Console, Direct Trunk Attendant, 2-13 Selector, 2-25 Switched Loop Attendant, 2–17 Consoles, Dual Attendant, 2-27 Coupler, Acoustic, 4-40 Data Call Preindication, 2-247 Call Setup, 2-105 Features, 2-3 Line (TN726), 3-24 Services Ove ...
AT&T 1987 AT&T - page 455

Line (Contd.) Status and I-Use Indications, 2-157 Lines, Personal, 2-184 Loop Start Trunk (ZTN77), 3-18 Maintenance Manual, 8-2 Software, 3-45 System, 2-234 Making a Data Call From Expert Mode, 2-135 Manual Signaling, 2-159 Memory Allocation, 3-45 Circuit Pack (ZTN81 or ZTN127), 3-5 Message Center Administration, 2-161 Message Center-Like Operation ...
AT&T 1987 AT&T - page 456

Speaker, 2-206 Speakerphone Adjunct, 2-207 Speed Dialing, 2-212 Splitting One-Way Automatic, Attendant, 2-47 STARLAN INTERFACE (ZTN84), 3-37 Circuit Pack, 2-216 STARLAN NETWORK Access (V2), 2-215 Administrable Parameters, 2-221 Station Features, 2-4 Hunting, 2-222 Interconnect Panel (SIP), 4-48 Message Detail Recording (SMDR), 2-62 Station-To-Stati ...

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A complete manual for the device AT&T 1987 AT&T, how should it look like?
A manual, also referred to as a user manual, or simply "instructions" is a technical document designed to assist in the use AT&T 1987 AT&T by users. Manuals are usually written by a technical writer, but in a language understandable to all users of AT&T 1987 AT&T.

A complete AT&T manual, should contain several basic components. Some of them are less important, such as: cover / title page or copyright page. However, the remaining part should provide us with information that is important from the point of view of the user.

1. Preface and tips on how to use the manual AT&T 1987 AT&T - At the beginning of each manual we should find clues about how to use the guidelines. It should include information about the location of the Contents of the AT&T 1987 AT&T, FAQ or common problems, i.e. places that are most often searched by users in each manual
2. Contents - index of all tips concerning the AT&T 1987 AT&T, that we can find in the current document
3. Tips how to use the basic functions of the device AT&T 1987 AT&T - which should help us in our first steps of using AT&T 1987 AT&T
4. Troubleshooting - systematic sequence of activities that will help us diagnose and subsequently solve the most important problems with AT&T 1987 AT&T
5. FAQ - Frequently Asked Questions
6. Contact detailsInformation about where to look for contact to the manufacturer/service of AT&T 1987 AT&T in a specific country, if it was not possible to solve the problem on our own.

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Manual AT&T 1987 AT&T

Summary

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