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Connecting the SEHI to the Network
SEHI100TX User’s Guide 5-3
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.
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
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SEHI Book Page 3 Wednesday, May 15, 1996 10:42 AM