Cabletron Systems SEHI-22FL Mode D'Emploi

This chapter contains instructions for using LANVIEW LEDs to 
troubleshoot physical layer network problems. It also describes how to 
reset the SEHI and how to reset the NVRAM switch.

After connecting the SEHI to the network, verify that the packets pass 
between all Ethernet devices connected to the SEHI and any other devices 
connected to the network. If there is a problem 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, proceed with the following steps:

a.

Check that the 10BASE-FL device at the other end of the fiber 
optic segment is powered up and that the TX and RX fibers are 
properly connected.

b. For twisted pair EPIMs such as the EPIM-T, verify that the 

connector on the twisted pair segment has the proper pinouts. 
Refer to Chapter 3 for the pin assignments for twisted pair 
connectors.

For the SEHI 10BASE-FL ports and the EPIM-F1, EPIM-F2, or 
EPIM-F3 check that the TX and RX fibers are properly connected.

c.

Check the cable for continuity. Several tools are available for this 
test, depending on the media used.

d. Check that the twisted pair segments meet cable specifications for 

SEHI Book  Page 1  Friday, April 19, 1996  10:46 AM