User`s guide

SEH USER’S GUIDE 5-1
CHAPTER 5
TROUBLESHOOTING
This chapter contains instructions for using LANVIEW LEDs to
troubleshoot physical layer network problems.
5.1 INSTALLATION CHECK-OUT
After connecting the SEH to the network, verify that packets pass
between all Ethernet devices connected to the SEH and any other devices
connected to the network. If difficulty is encountered with any of the
attached devices, check the link as follows:
1. Check that the LNK LED, if applicable, for the port is on. If the LED
is off, try the following steps.
a. Check that the 10BASE-T device at the other end of the twisted
pair segment is powered up.
b. Verify that the connector on the twisted pair segment has the
proper pinouts. Refer to Chapter 2 for the pin assignments for
twisted pair connectors.
c. For EPIM-F1/EPIM-F2/EPIM-F3 check that the TX and RX
fibers are properly connected.
d. Check the cable for continuity. A variety of tools are available for
this test, depending on the media you are using.
e. Check that the twisted pair segments meet cable specifications for
dB loss described in Chapter 2.
SEH Book Page 1 Tuesday, March 19, 1996 4:12 PM