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Enterasys Networks 4G4205-72 Switch User Manual

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Connecting to the Network

3-16 Installation

3. VerifythatalinkexistsbycheckingthattheportRX(Receive)LEDisON(flashing

amber,blinkinggreen,orsolidgreen).IftheRXLEDisOFFandtheTX(Transmit)

LEDisnotblinkingamber,performthefollowingstepsuntilitison:

a. Toviewthereceiveandtransmit

activityonagroupofsegments,pressthe

GROUPSELECTbuttonforlessthanonesecond(seeFigure 3‐4)tosteptothe 

groupofinterest(Groups1through4).

b. EachtimetheGROUPSELECTbuttonispressedforlessthatonesecond,the

GROUPLEDlightsupinsequence,

indicatingwhichGroupisselected.The

receiveandtransmitactivityforthatgroupofsegmentsisthenindicatedbythe

RXandTXLEDsforeachsegment.

c. VerifythatthecablingbeingusedisCategory5UTPwithanimpedancebetween

85and111 ohms.Iftheportistooperateat

100 Mbps,category 5cablingmustbe

used.

d. Verifythatthedeviceattheotherendofthetwistedpairsegmentison,and

properlyconnectedtothesegment.

e. VerifythattheRJ45connectorsonthetwistedpairsegmenthavetheproper

pinoutsandcheckthecableforcontinuity.Typically ,acrossovercableis

used

betweenhubdevices.Astraight‐throughcableisusedtoconnectbetween

switchesorhubdevicesandanenduser(computer).RefertoFigure 3‐5and

Figure 3‐6forfour‐wireRJ45connections.RefertoFigure 3‐7andFigure 3‐8for

eight‐wireRJ45connections.

Note: If the RX and TX LEDs of a port do not indicate a link and the end-point device is a

PD, you may have a port without 48 Vdc to operate the PD. To check the PoE Port Status,

refer to “Verifying PoE Port Status” on page 3-19.

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