Cabletron Systems SEHI-22FL 사용자 가이드

Chapter 5: Connecting to the Network

Before connecting a segment to the EPIM-T, check each end of the 
segment to determine if the wires cross over for proper connection. If the 
wires do not cross over, use the switch on the EPIM-T to internally cross 
over the RJ45 port. Figure 5-2 shows the pin assignment of the port 
according to the switch position.

To connect an EPIM-T to a twisted pair segment:

1. Connect the segment to the module by inserting the RJ45 connector on 

2. Check that the EPIM LNK LED is on. If the LED is off, perform each 

of the following steps until it is on:

a.

Check that the device at the end of the segment is powered up.

b. Verify that the RJ45 connector on the twisted pair segment has the 

proper pinouts.

c.

Check the cable for continuity.

d. Check that the twisted pair connection meets dB loss and cable 

e.

Check that the crossover switch is in the correct position.

Position =
(not crossed over)

1. TX+
2. TX-
3. RX+
4. NC

5. NC
6. RX-
7. NC
8. NC

Position X
(crossed over)

1. RX+
2. RX-
3. TX+
4. NC

5. NC
6. TX-
7. NC
8. NC

1490_14

SEHI Book  Page 4  Friday, April 19, 1996  10:46 AM