Cabletron Systems SFCS-200BX User Manual

To see the carrier state of the board, issue the following command:

The -d option displays device statistics in the following format:

Device statistics:

      Buffer Allocation Failures 

        Type 1           Type 2

    Small    Large    Small    Large    Receive Queue Full    Carrier

        

0        0        0        0                     0         ON

If  ON is displayed in the Carrier field, then the physical link is fine.

If the board does not see a carrier (OFF is displayed in the Carrier field), then
there is either a problem with the loopback fiber or there is a hardware prob-
lem with the optical drivers on the board. Check the fiber. If the fiber is bad,
replace the fiber and run looptest again. If the fiber is not bad, then call
Cabletron Systems’ Technical Support for further assistance.

Alternatively, if you have access to the back of the host and can see the LED
displays on the adapter backplate, a red LED on the R (Receive port) also
indicates carrier failure.