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3Com 3C16987A - page 1
http://www.3com.com/ Par t No. DU A169 8-7AAA 0 2 Publ ished Augus t 2000 Sup erStac k ® 3 Swit ch 3300 SM User Gui de 3C16987A ...
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3Com Cor poratio n 5400 Bayfr ont Plaza Santa Cl ara, Calif ornia 95052- 8145 Copyri ght © 20 00, 3Com T echnolog ies. All rights reserve d. No part of this docume ntation may be reproduced in any for m or by a ny mea ns or used to make any deriva tive work (such as translat ion, tra nsforma tion, or adapta tion) withou t writt en permi ssion from ...
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C ONTENT S A BOUT T HIS G UIDE Conventions 8 Related Doc umentation 9 Y ear 2 000 Com pliance 10 Documentation Comm ents 10 Product Registration 10 1 I NTR ODUC ING THE S WITCH 3300 SM About the SuperStack 3 Switch 3300 SM 12 Summary of Featu re s 12 Switch 33 00 SM — Fr ont View D etail 13 10BASE- T/ 100BASE-T X Ports 13 1000BASE- SX Port 13 LED ...
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2 I NSTALLING THE S WITC H Choosin g a Su itable Site 24 Rack-mounting 2 4 Placing Units On T op of E ach Other 25 St acking U nits 26 St acking T wo Unit s 26 St acking Up T o Four Units 27 The Power -up Sequence 29 Connectin g a Re dundant Pow er System 29 Powering-up the Sw itch 3300 S M 29 Checki ng fo r Co rr ect Op erat ion 29 Choosing the Co ...
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G LOSSARY I NDEX 3C OM C O RPORATION L IMI TED W ARRANTY R EGULATO RY N OTIC E S ...
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A BO UT T HI S G UI DE This gui de pro vid es all the in for mation you need to install and use a Super Stack ® 3 Switc h 3300 SM (3 C16 987 A) unit w ith de fault se ttings. If you w ant to ch ange t he w ay th e Sw itch work s using manage me nt soft ware, r ef er to the “ Super Sta ck Switch Manag ement Guid e ” . The gu ide is intend ed fo ...
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8 A BOU T T HIS G UI D E Conve ntions Ta b l e 1 and Ta b l e 2 list conventi o ns that ar e used thr ou ghout th is guide. Ta b l e 1 N otice Ic ons Ic on Notice Ty pe Descripti on In fo rmat io n n o te In fo rmat io n t hat d esc ribes im por ta nt fe atu res o r ins truc tio ns Cauti on Info r mat ion th at alert s y ou to pot e nt ial loss of ...
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Relat ed Docu menta tion 9 Related Do cumen tati on In add ition t o this g uide , each Sw itch 33 00 SM doc umen t set i nclud es th e fo llow i ng : ■ Ma nagemen t Gui de This gu ide contai ns all the ma nagem ent inform ation for the Swi tch. ■ Qui ck Refe rence Gui de This g uide co ntains a quic k summary of the har d war e an d so ftwar e ...
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10 A BOU T T HIS G UI D E Y ear 200 0 Compli ance For i nfor matio n on Y ear 2000 com plian ce and 3Co m p roducts, visit t he 3Co m Y e ar 2000 Web page: http :/ /w ww.3c om .c om/p ro du cts/y r2 000. ht ml Do cumen tation Comme nts Y our suggest io ns ar e very imp ortant t o us. They will h elp make o ur docum en tation m ore usef ul to you. P ...
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1 I NTR ODUCING THE S WI TCH 3300 SM This c hapter c ontai ns intr od uct ory inf ormation about the Swit ch an d how it ca n be u sed in y our ne tw ork. I t cov ers the f ollow ing t opics : ■ Abo ut th e Su perSta ck 3 Sw itch 3300 S M ■ Switch 33 00 SM — Fr ont Vi ew Det ai l ■ Switch 33 00 SM — Rear View Detail ■ Netwo rk C onfig u ...
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12 C HAPTER 1: I NTRODUCING THE S WITCH 3300 SM Ab out the Su per S tac k 3 Swi tc h 3 300 SM The Supe rSt ack ® 3 Sw itch 330 0 SM conn ects : ■ your existing 10M bps dev ices. ■ high-pe rfo rmance wo rkgroups wi th a 1 00Mbp s or 1000M bp s backb one o r ser ver co nne ction. ■ users to dedica ted 1 00M bps po rts in on e sw itch. In addi ...
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Swit ch 3300 SM — Front View Det ail 13 Swi tc h 3 300 SM — Fr o nt Vie w Detail Figure 1 Switch 3300 SM — front view 10B A SE - T/ 100B AS E-TX P orts The Swit ch has 24 au to-neg otiat ing 10BASE- T/100 BASE-TX ports conf igure d as M DIX (cross- over ). These ports can be set to 10BASE-T half duplex , 10 BASE- T full du ple x, 100B AS E-TX ...
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14 C HAPTER 1: I NTRODUCING THE S WITCH 3300 SM Ta b l e 3 LED behavior LED Color In dicates Port S t atus LEDs Packet Yellow Packets ar e bei ng transm itt ed/ re ceive d on the por t. Off No pack et s are be i n g tra nsmi tt ed/re cei ve d o n th e port. Statu s Gr een A lin k is pre sent, and the por t is enab le d. Green flas hi ng A lin k is ...
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Switc h 33 00 SM — Re ar View Det ail 15 Swi tc h 3 300 SM — Re ar V iew D eta il Figure 2 Switch 3300 SM — r ear view Unit In fo rmatio n Label This la bel shows the following : ■ The 3C om p roduct name o f the S witc h ■ The 3Com 3C numb er of the Swit ch ■ The uni que MAC address (Et hernet addr ess ) of th e Switch ■ The ser ial ...
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16 C HAPTER 1: I NTRODUCING THE S WITCH 3300 SM Cons ole Port T he con s ol e po rt al lo ws yo u to c onn ec t a te rm in al and p erf or m rem ot e o r local out-of -ban d ma nageme nt. Th e con sol e port uses st andard n ull mode m ca ble and i s set to aut o-baud, 8 d ata bit s, no pa rity an d 1 stop bit. M atrix Port The Matrix Port al lo ws ...
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Network Conf i gurati on Exam ples 17 Net work Config uration Exam p les The f ollowi ng il lustra tio ns show s ome example s of how th e Switch c an be us ed i n y o ur net wor k. Switch 3300 SM a s a Segm entati on S wi tch The example in Figu r e 3 shows how a Switc h 3300 SM stack can s egment a network of shared 10Mb ps ,100Mbp s and 100 0Mbp ...
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18 C HAPTER 1: I NTRODUCING THE S WITCH 3300 SM Switch 3300 SM a s a Coll aps ed Back bon e Sw itc h The exam ple in Figu r e 4 shows ho w a Swi tch 3300 S M stack can a ct as a backb one f or bo th sha re d a nd sw itch ed net work segmen ts. Figure 4 Using the Swit ch as a co llapsed bac kbone Switch 3300 SM stack Endstations on switched 10Mbps c ...
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Network Conf i gurati on Exam ples 19 Switch 3300 SM a s a D esk top S wi tch The example i n Fi gu r e 5 show s how a Sw itch 330 0 SM can be u sed, within a stac k, fo r a g r oup of use rs that requi re dedic ated 1 0Mbp s or 100Mbps connecti o ns to the de sktop . The 3300 SM Switc hes pr o vid e a Gig abit Et hernet connectio n to a SuperSt ac ...
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20 C HAPTER 1: I NTRODUCING THE S WITCH 3300 SM Config uration Rul es fo r Fas t E th er n et The t opolo gy rule s for 100 M bps Fast Et hern et are sl ightly di ffer ent to those f or 10 Mbps E ther ne t. Fi gure 6 illus trates the key topo log y rules and pr ovi des exampl es of how they allo w for lar ge -scale F ast Et hernet netw orks. Figure ...
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Co nfi gur atio n R ule s wit h F ull D uplex 21 The key to polog y rules are: ■ Ma ximum UTP cable l eng th is 100m (3 28f t) ov er Cat egory 5 cab le. ■ A 412 m (1352f t) fiber run is al lowed for conne cting swi tch-to-sw itch, or endst ation -to-sw itch , usin g half-du ple x 100BA SE- FX. ■ A tot al ne twork spa n of 325m (1 066 ft) is a ...
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22 C HAPTER 1: I NTRODUCING THE S WITCH 3300 SM Config uration Rul es fo r Gig a b it Eth er n et Gigab it Eth ern et i s designe d to run ov er fou r me dia: ■ Singl e-mode fibe r opt ic cab le, w ith conn ect ions up to 5km . ■ Mul timode fibe r optic cable , wit h conne ction s up to 550m. ■ Bala nced, shield ed c opper c abling , with co ...
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2 I NSTALLI NG TH E S WITCH This ch ap ter co ntain s the inform ation y ou need t o insta ll and se t up t he Swi tch. It c over s th e foll o wing topi cs: ■ Choosing a Suitable Si te ■ Rack- mo unti ng ■ Placin g Un its On T o p of Ea ch Ot her ■ Stack ing Units ■ The Power -up Sequence ■ Choosing the Corr ect Cables ■ Solving Prob ...
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24 C HAPTER 2: I NSTALLING THE S WITCH Choosin g a Suita ble Si te The Swit ch is su ited for use in an off ice envir onm e nt wher e it c an be mount ed in a standa rd 19- inch equipm ent rack, or free st anding. Alter na tively , th e S wit ch can be rack -mount ed in a wiring closet or equipm ent r oom . A r ack- mou nting k it, con taini ng two ...
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Plac in g Units On Top of Ea ch Other 25 Figure 7 Fitting a brac ket for rack mounti ng 3 In se rt t h e tw o scre ws a nd t ig hte n wi th a sui ta ble s crew d ri ver . Y ou must use the sc rews su pplie d with the mo unti ng brac kets. Dam a ge caused to the uni t by using incorrec t scr ews inval idates y our w arrant y . 4 Repea t step s 2 and ...
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26 C HAPTER 2: I NSTALLING THE S WITCH Sta cki ng Un its U nits in the S witch 11 00/3 300 fam ily can b e stac ked toget her an d the n tr eat ed as a sing le manageable unit wi th one IP add r ess. The Mat rix Port o n th e rear of the Switch al lows yo u to connec t two Switch units back -to-ba ck. For this y ou need a Matr ix Cable (par t numb ...
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Stack in g Un its 27 Figure 8 A stack of two uni ts Stack ing Up T o Four Units Y ou c an st ack up to fo ur S witch units using a Sw itch 33 00 M M and t he appr opr iate number of Matrix Cables. Y ou nee d only one Super Stack 3 Sw itch 33 00 MM p er stack . T o stack up to fou r Switch u nits: 1 Po we r - o ff al l th e uni t s. 2 Arrang e the u ...
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28 C HAPTER 2: I NSTALLING THE S WITCH 4 If you u se th e mana gem ent sof tware of t he un its: ■ Ensure tha t all t he un its have the sa me ver sion o f mana gem ent software ■ Ensu re th at you re -c onfi gure t he st ack-wid e fea tur es on all the unit s Fo r m ore i nfo rm a tio n ab ou t m a na ge me n t so ft w are, s ee “ Ma naging ...
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The Pow er-up Sequen ce 29 Th e Pow e r - up Seq u enc e The f ollow ing sect ions descri be how to get you r Swi tch 330 0 S M pow ered- up a nd ready for ope ration. Co nnect ing a Redund an t P ower Syst e m Y ou c an co nnec t a SuperS tack Ad vance d Red und ant Po wer S ystem (par t num ber 3C 1 607 1B) to the Switch. Thi s unit, w hic h is a ...
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30 C HAPTER 2: I NSTALLING THE S WITCH I f there i s eviden ce of a pr ob lem, see “ Solvin g Prob lems Indi cated by LEDs ” on pa ge 31 . Choosin g the Co rr e ct Ca bles All of the ports o n the front of the Switch 33 00 SM a re co nfigured a s MDIX (cr oss-ov er). If y ou want to make a con necti on to an other MDIX port , you ne ed a cross- ...
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Solvi ng Probl ems I ndi cated by LE Ds 31 Solving Problems Indicated by LEDs If the LEDs on the Switch in dicat e a pr oblem, r e fe r to Ta b l e 6 which contai ns a list of problem s and su ggest ed solu tions. For inf orma tion a bout solv ing pro blems w hen man aging t he Switch, refer to t he Pr oblem Solvi ng c hapter in the “ S upe rStac ...
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32 C HAPTER 2: I NSTALLING THE S WITCH Manag ing th e Sw itch The S witc h contai n s sof t war e that allows you t o chan ge an d monito r the way it wo rks. Th is mana gem en t s oft w ar e is not requi red to g et the Switch w ork ing, b ut if y ou d o us e it, y ou ma y imp rove th e effic iency o f the Swi tch and ther ef ore impro ve th e ove ...
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A S AFETY I N FORMA TION Y ou m ust re ad the fo llowing safet y infor matio n before c arryi ng out any install ation or r em oval o f comp onen ts, or any m aintena nce procedures on the Switch 330 0 SM . WARN ING : W arnin gs cont ain di rection s th at you m ust f ollow for y our personal saf ety . Follow all dir ectio ns carefully . Y ou mus t ...
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34 A PPENDIX A: S AFETY I NFORM ATION Importa nt Safe ty In form atio n ■ Install ation and remo val of the un it mu st be ca rried o ut by qua lified pers onnel o nly . ■ If insta lling th e Swit ch uni t in a stack with Super Stack H ub u nits, th e Switch 33 00 SM uni t must be insta lled b elow th e Hu b unit s. ■ The un it sho uld n ever ...
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Imp or ta nt S afe t y In form at io n 35 ■ Franc e and Peru onl y: This unit ca nnot be p owe red from IT † supplies. If your supplie s are of I T type, this unit m ust be po wered by 230V (2P+T) via an isolati o n transf ormer ratio 1:1 , wi th th e secon dary co nnec tion point l abelled Neut ral, c onnec ted di re ctly to e arth (g r ound ) ...
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36 A PPENDIX A: S AFETY I NFORM ATION L ’ inform at ion de S é curit é Im port ante ■ L' install ati on et la d é po se de c e gr oup e do ive n t ê tre c onf i é s à un pers onnel q ualif i é . ■ Si vous enta ssez l'u nit é Swi tch avec les unit é s S u per Sta ck H u b, l' u ni t é Switch 33 00 SM d oit ê tre insta ...
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L ’ info rma ti on de S é curi t é Im por tan te 37 ■ L ’ app areil fo nctionn e à une tensi on e xtr ê mem ent basse de s é cu ri t é qui est co nfor me à la no rm e CEI 950 . Ce s cond itions n e sont maintenue s que si l' é quipe m ent a uquel i l est raccord é foncti onn e dans les m ê me s cond itions. ■ Fra nce e t P é ...
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38 A PPENDIX A: S AFETY I NFORM ATION Wi ch ti ge Sicherh eitsinfor mat ion en ■ Die In stallation und der Ausba u de s Ger ä ts darf nur d ur ch Fach per sonal erfol gen . ■ Wenn di e Sw itch 33 00 SM E inh eit in e iner Stapel mit a nderen Super Stack H ub E inh eiten ei ngeb aut werden soll , mu ß die Swit ch 3300 S M Ei nheit unter d ie s ...
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Wi chti ge Si cherhei t si nform atio nen 39 WARN HIN WEIS : F ase ropt ik ansc hl ü sse - Optisc he Siche rheit. Niemals mit eine m V e rgr öß erun gsger ä t einen Ü bertr agungs-L aser betr acht en, w ä hrend d ieser eing eschal tet ist. Nie m als di rekt auf d en Fa ser Anschlu ß und auf die Faser kabelen den schauen, w ä hrend diese ei ...
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40 A PPENDIX A: S AFETY I NFORM ATION ...
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B P IN - OU TS Nu ll Modem Cable 9-pin t o R S-232 25 -p in PC-A T Seri al Cabl e 9-pin to 9 -pin Screen TxD RxD Ground RTS CTS DSR DCD DTR Screen RxD TxD Ground RTS DTR CTS DSR DCD Shell 3 2 5 7 8 6 1 4 1 3 2 7 4 20 5 6 8 Switch 3300 SM Cable connector : 9-pin female PC/T erminal Cable connector: 25-pin male/f emale only required if screen alway s ...
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42 A PPENDIX B: P IN - OU TS Modem Ca ble 9-pin t o R S-232 25 -p in RJ45 P in Assign me nts Pi n assignment s ar e identic al f or 10BASE-T an d 100BASE- TX RJ45 co nnector s Screen TxD RxD RTS CTS DSR Ground DCD DTR Screen TxD RxD RTS CTS DSR Ground DCD DTR Shell 3 2 7 8 6 5 1 4 1 2 3 4 5 6 7 8 20 Switch 3300 SM Cable connector: 9-pin female RS-2 ...
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RJ45 P in Assi gnment s 43 Ports c onfigu red as MDI X 1 RxData + Receiv e Data 2 RxData – Rece ive Data 3 TxData + Tra nsmi t data 4 Not as signe d 5 Not as signe d 6 TxData – Tra nsmi t dat a 7 Not as signe d 8 Not as signe d Ta b l e 7 Pin assignments Pin Number Si gnal Funct ion ...
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44 A PPENDIX B: P IN - OU TS ...
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C T ECHNI CAL S PECIFICATIONS Physic al Dimensio ns Heigh t: 43 .6mm x Width: 440m m x Depth: 247.5 mm Weig ht: 5kg (11lbs) Envir onment al Requir ement s Oper ating Tempera tur e 0 ° to 5 0 ° C ( 32 ° to 122 ° F) Stora ge Temperat ure – 10 ° to +7 0 ° C (14 ° to 158 ° F) Oper ating Humidity 10 – 95% r elat ive humidity, n on-conde nsin ...
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46 A PPENDIX C: T ECHNICAL S PECIFICATIONS Standar ds Support ed SN MP SN MP pr otocol (RFC 11 57) MIB -II (R FC 1213) Bri dge MIB (RFC 1493) Repeat er MI B (RF C 1516) VLAN M IB (RFC 1573) RMON MIB (RFC 1271) BOOTP ( RF C 95 1) T erm inal Emul ati on Teln et ( RFC 854) Prot oco ls Used for A d min istr a tion UDP ( RFC 768) IP (R FC 791) ICMP (RFC ...
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3Com 3C16987A - page 47
D T ECHNI CAL S UPPO RT 3Co m p r ovide s easy a cce ss to t echn ical suppor t infor mat ion throug h a vari ety of serv ic es. This app endi x descr ibes th ese serv ic es. Infor mation co ntained in th is appendi x is co rre ct at t ime o f publ icatio n. For the mos t r ece nt i nformati on, 3 Com r ecommends t hat you a ccess the 3Com Corpor a ...
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3Com 3C16987A - page 48
48 A PPENDIX D: T ECHNICAL S UPPORT 3Co m F TP S i te Down load drivers, patches , software, and MIBs across the In tern et fro m the 3Com p ublic F TP site. This service is availa ble 24 hours a day , 7 days a week. T o con nect t o the 3Com F TP site, ente r the foll owing info rmati on in to yo ur F TP client: ■ Hostname: ft p.3c om .com ■ U ...
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3Com 3C16987A - page 49
Support f rom 3Com 49 ■ Diagno stic error message s ■ Detai ls abou t recen t confi guratio n ch ange s, if a pplicabl e Here is a list of w orldw ide tec hnical t elep hone support nu mb ers: Count r y Te lep hon e Numb er Count ry Tel eph one Nu mber Asia, Paci fi c Ri m Australi a Hong Kong Indi a Indo nes ia Japan Ma la ys i a New Ze alan d ...
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50 A PPENDIX D: T ECHNICAL S UPPORT Retu rning P roducts fo r Rep ai r Before you se nd a product di rectly to 3Co m for repair , y ou must firs t obtai n an au thoriz ation n um ber . Pr oduc ts sen t to 3 Com witho ut author ization num ber s will be return ed t o the se nder u nope ne d, at th e sender ’ s e xpense . T o obtain an autho rizat ...
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3Com 3C16987A - page 51
G LOSSARY 10B A SE - T The IEEE specific ation for 10Mbps E ther net over Cat egory 3, 4 or 5 twist ed pai r ca ble. 100B A SE-FX The IEEE specif ica tion fo r 100Mbps Fas t Ethernet over fiber -optic ca ble. 100BA SE -TX The IEEE specif ication for 100Mb ps Fast Et hernet over Ca tegory 5 t wi st ed - pai r ca ble . 1000 BA SE-S X The IEE E specif ...
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52 G LOSSARY inform ation to for ward pac kets ba sed o n their destinati on a ddress. This process is known as fil tering. br oadc a st A pac ket sent to al l devic es on a ne twork. broa dc ast st or m Mult iple s imultan eous br oad casts that ty pic ally absor b all th e availab le netw ork bandwidt h and ca n cau se a ne tw ork to fail. Broad ...
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3Com 3C16987A - page 53
53 fu ll du pl ex A sy s te m th at al lo w s pa c k ets t o b e tra ns mi t ted and rec ei v ed a t th e same t ime a nd, in e ffect, doub les the pot ential t hroughpu t of a link. half du pl ex A system that al lows pa ckets t o tran smitted a nd rece ived, but no t at the sam e ti me. Cont rast with full dupl ex . hub A device that r egen er at ...
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54 G LOSSARY lo op An event t h at occ urs when two net work devi ces ar e co nnected by mor e than one path, t her eby causing packet s to r epeated ly cy cle ar ound th e net work and n ot reach t heir de stinatio n. MAC Media Access Control. A pr otocol speci fied by t he IEEE for d eterm ining whic h device s have acces s to a ne twork at any o ...
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55 ser v er A comp uter i n a networ k that is sh ared by mul tiple end stat ions. Se rv ers provide e ndstation s with access t o sha re d ne twor k serv ices suc h as compu ter files and prin ter queu es. SLIP Se rial Li ne Int erne t P rotocol. A protoc ol tha t allow s IP to run ove r a serial line (con sole po rt) conne ction . SN MP Si mple N ...
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56 G LOSSARY unic ast A packe t sent to a singl e endst ation on a network. WAN Wide Area Network. A communicatio ns net work that c overs a wide ar ea. A W AN can cover a large g eogra phic ar ea, and may cont ain severa l LANs within it. ...
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I NDEX Numbers 1000BASE - S X 13 10BASE- T/ 100BAS E-TX por ts 13 3C nu mb e r 15 3Com K nowle dgeb ase W eb S ervic es 47 3Com URL 47 A auto- neg otiat in g ports 1 3 C cab le choos ing the cor r ec t 30 Matrix 16 maximum length 13, 21, 22 pin- outs 41 conso l e port 16 conve nt ions noti ce ic ons, About Thi s Guid e 8 text , About Thi s Guide 8 ...
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58 I NDEX powe ring- up a S witch 33 00 SM 29 pro duct name 15 R rack mounti ng a Swi tch 3300 S M 24 Redunda nt Po wer S ystem . See RP S re turning p r oduc ts for repa ir 50 RPS 15 co nnecti ng 29 soc k et 15 S s afe ty i nf or mati on Engli s h 3 4 Fr ench 36 German 38 segment , max imum l ength 13, 21 seri al num be r of the Swi tch 15 se rial ...
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3Com 3C16987A - page 59
3Com C or porat ion L IMITED W ARRANTY Th is w arr an ty a ppl ie s t o cus to mer s loc ate d i n t he Uni te d S tat es , Aus tr ali a, C an ada (e x cept Qu eb ec) , Ir el an d, Ne w Zeal an d , U. K., and other Engl ish language countr ies, and cou ntri es for whi ch a tran slation into the loca l langua ge is n ot prov ided. S UPER S TACK ® 3 ...
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3Com 3C16987A - page 60
shippe d to Cust omer, at 3Co m's expe nse, not l ater tha n thirty (30) d ays af ter 3Co m receive s the defe ctive product , and 3C om will re tain risk of loss or dama ge until the item i s delivere d to Cu stomer. 3Com sha ll not be respons ible for a ny softwa re, firmwa re, info rmation, or memor y data of Custome r containe d in, st ore ...
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OF O R IN C ONN EC TI ON WI TH THE SA LE, IN ST ALLA TI ON, MA IN TE NANC E, US E, PE RF ORM ANCE , FA ILU RE, OR INT ER RUP TI ON O F I TS P RODU C T S, EVE N I F 3CO M OR ITS AUTH ORIZED R E SELL ER HAS B EEN A DVI SE D OF TH E PO SS IBIL I TY OF SUCH DA MA GES, AND LI MITS I TS LIA BIL I TY T O RE PA IR, REP LACE MEN T, O R R EFU ND OF TH E PURC ...
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3Com 3C16987A - page 62
R EGULATORY N OT ICES FCC S TA TEMENT This equipme nt has be en test ed and fou nd to compl y with t he limits f or a Class A digita l device , pursuant t o part 15 o f the FCC rules. T hese li mits ar e designe d to provi de reas onable pr otection against harmful int erf e renc e wh en th e eq u ip men t i s op er ate d in a c om me rci al env ir ...
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