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Chapter 5: Connecting to the Network
5-4 SEHI User’s Guide
5.1.2 Connecting a UTP Segment to an EPIM-T
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.
Figure 5-2 EPIM-T Crossover Switch
To connect an EPIM-T to a twisted pair segment:
1. Connect the segment to the module by inserting the RJ45 connector on
the segment into the RJ45 port on the module. See Figure 5-2.
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
specifications outlined in Chapter 3, Section 3.1.3.
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
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SEHI Book Page 4 Friday, April 19, 1996 10:46 AM