Enterasys Enterasys Gold Distributed Forwarding Engine 4G4282-49 Instalační příručka Strana 48

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Connecting to the Network
3-16 Installation
Connecting UTP Cables
ThefixedRJ45frontpanelconnectionsofthe4G420272and4G428249are10/100/1000
Mbpsports.Theseportshaveinternalcrossovers,andalsosupportautomaticpolarity
sensingwhenconfiguredforautomaticnegotiation.
Ifautomaticnegotiationisnotactivatedonaport,useastraightthroughcablewhen
connectingaworkstation
totheport.Whenconnectinganetworkingdevicetotheport,
suchasabridge,repeater,orrouter,useacrossovercable.
Ifaportissetforautonegotiation,automaticpolaritysensingisalsoactivated.
Automaticpolaritysensingeliminatestheneedforacrossovercable,whetherthe
connectionisto
anothernetworkdeviceoraworkstation.
Inthisprocedure,the 4G420272isusedastheexampletoconnectatwistedpairsegment
tothemodule.Itisalsoassumedthatthechassispoweristurnedontoprovidepowerto
themodule.RefertoFigure 38onpage 317and
proceedasfollows:
1. EnsurethatthedeviceconnectedtotheotherendofthesegmentispoweredON.
2. ConnectthetwistedpairsegmenttothemodulebyinsertingtheRJ45connectoron
thetwistedpairsegmentintotheappropriateRJ45portconnector.
3. Verifythatalinkexistsbycheckingthattheport
RX(Receive)LEDisON(flashing
amber,blinkinggreen,orsolidgreen).IftheRXLEDisOFFandtheTX(Transmit)
LEDisnotblinkingamber,performthefollowingstepsuntilitison:
a. Toviewthereceiveandtransmitactivityonagroupofsegments,pressthe
GROUPSELECT
button(seeFigure 38onpage 317)tosteptothegroupof
interest(Groups1through3onthe4G420272,orGroups1through5onthe
4G428249).EachtimetheGROUPSELECTbuttonispressed,aGROUPLED
lightsupinsequence,indicatingwhichGroupis
selected.Thereceiveand
transmitactivityfor thatgroupofsegmentsisthenindicatedbytheRXandTX
LEDsforeachsegment.
b. VerifythatthecablingbeingusedisCategory5UTPwithanimpedancebetween
85and111 ohms.Fortheporttooperateat100or1000Mbps,Category 5
cabling
mustbeusedandinstalledproperly.
c. Verifythatthedeviceattheotherendofthetwistedpairsegmentisonand
properlyconnectedtothesegment.
d. VerifythattheRJ45connectorsonthetwistedpairsegmenthavetheproper
pinoutsandcheckthecableforcontinuity.Typically ,acrossovercable
isused
betweennetworkdevices.Astraightthroughcableisusedtoconnectbetween
switchesorhubdevicesandanendsystem(computer).RefertoFigure 39and
Note: All RJ45 front panel ports on the 4G4202-72and4G4282-49 support Category 5
Unshielded Twisted Pair (UTP) cabling with an impedance between 85 and 111 ohms.
Category 3 cable may be used if the connection is going to be used only for 10 Mbps.
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