Avaya Troubleshooting Routers Průvodce řešením problémů stáhnout pdf (Strana 77)

Troubleshooting a Physical Media Problem

4-5

You can also loop back PPP lines. But if you conﬁgured them with a

password, you must conﬁgure them in promiscuous mode ﬁrst.

If you are accessing a DTE/DCE line with promiscuous mode off, the port

will not increment the reception statistics.

If the connection is FDDI or ATM Rx and Tx,

a. Make sure you cabled correctly the A and B ports.

b. Try looping Port A back to Port B to test for port failure.

If the Tx and Rx LEDs light, the ports and cable are OK.

c. Check the event log to make sure that the router brings the ring up

and marks the circuit as active.

d. If the loopback test fails, try a different ﬁber cable. Then try

replacing the link module.

Note: Multimode ﬁber is orange, and single-mode ﬁber is yellow. The

different ﬁbers require different interface modules.

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Avaya Troubleshooting Routers Průvodce řešením problémů Strana 77