Connecting to the Network
3-16 Installation
3. VerifythatalinkexistsbycheckingthattheportRX(Receive)LEDisON(flashing
amber,blinkinggreen,orsolidgreen).IftheRXLEDisOFFandtheTX(Transmit)
LEDisnotblinkingamber,performthefollowingstepsuntilitison:
a. Toviewthereceiveandtransmitactivityonagroupofsegments,pressthe
GROUPSELECTbuttonforlessthanonesecond(seeFigure34)tosteptothe
groupofinterest(Groups1through4).
b. EachtimetheGROUPSELECTbuttonispressedforlessthatonesecond,the
GROUPLEDlightsupinsequence,indicatingwhichGroupisselected.The
receiveandtransmitactivityforthatgroupofsegmentsisthenindicatedbythe
RXandTXLEDsforeachsegment.
c. VerifythatthecablingbeingusedisCategory5UTPwithanimpedancebetween
85and111ohms.Iftheportistooperateat100 Mbps,category 5cablingmustbe
used.
d. Verifythatthedeviceattheotherendofthetwistedpairsegmentison,and
properlyconnectedtothesegment.
e. VerifythattheRJ45connectorsonthetwistedpairsegmenthavetheproper
pinoutsandcheckthecableforcontinuity.Typicall y,acrossovercableisused
betweenhubdevices.Astraightthroughcableisusedtoconnectbetween
switchesorhubdevicesandanenduser(computer).RefertoFigure35and
Figure 36forfourwireRJ45connections.RefertoFigure37andFigure 38for
eightwireRJ45connections.
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 page3-19.