Installation guide

Connecting to the Network

3-20 Installation

5. IftheRXLEDisOFFand theTX(Transmit)LEDisnotblinkingamber,performthe

followingstepsuntilitison:

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

85and111 ohms.Category 5 cablingmustbeusedfor1000Mbpsoperation.

b. Verifythatthe

deviceattheotherendofthetwistedpairsegmentison,and

properlyconnectedtothesegment.

c. 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 3‐11and 

Figure 3‐12forfour‐wireRJ45connections.RefertoFigu re 3‐13andFigure 3‐14

foreight‐wireRJ45connections.

Figure 3-11 Four-Wire Crossover Cable RJ45 Pinouts, Connections Between Hub

Devices

Note: When installing Mini-GBICs in the front-panel ports 1 through 18, you may need

to select a group of ports to verify the port operation. Initially GROUP 1 LED is green,

indicating that the status RX/TX LEDs are showing the activity on Group 1 ports

(1 through 6). To view the receive and transmit activity on another group, press the

GROUP SELECT button for less than one second (refer back to Figure 3-9) to step to

the next GROUP (1, 2, or 3) of 6 ports. The receive and transmit activity for that group

of segments is then indicated by the RX and TX LEDs for each segment.

1 RJ45 device port 3 RJ45-to-RJ45 crossover cable

2 Other device port 4 RX+/RX- and TX+/TX- connections.

These connections must share a common color pair.

TX+

TX

RX+

RX 2

TX+

TX

RX+

RX

ÀÁ