Cabletron Systems SEH-22 Manual De Usuario

5-1

This chapter contains instructions for using LANVIEW LEDs to 
troubleshoot physical layer network problems.

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