Cabletron Systems SEHI100TX manual Position X crossed over RX+ TX+ Position = Not crossed over

Connecting the SEHI to the Network

Position X (crossed over)

1. RX+	5. NC
2. RX-	6. TX-
3. TX+	7. NC
4. NC	8. NC

Position =

(not crossed over)

1. TX+	5.	NC
2. TX-	6.	RX-
3. RX+	7. NC
4. NC	8. NC		1511_11

Figure 5-2 EPIM-100TX Crossover Switch

Connect an EPIM-100TX to a twisted pair segment as follows:

1.Connect the twisted pair segment to the module by inserting the RJ45 connector on the twisted pair segment into the RJ45 port on the module. See Figure 5-2.

2.Check that the LNK LED on the EPIM-100TX is on. If the LED is off, perform each of the following steps until it is on:

a.Check that the 100BASE-TX device at the other end of the twisted pair 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 specifications outlined in Chapter 3, Section 3.1.2.

e.Check that the crossover switch is in the correct position.

If a link is not established, contact Cabletron Systems Technical Support.

SEHI100TX User’s Guide 5-3