Avaya Definity SI, Руководство по обслуживанию, Страница: 192 / 2968

Routine Maintenance Procedures
555-233-123 5-88 Issue 4 May 2002
Possible Causes
■
The fiber is disconnected from the A500 and/or the TN230Xs.
■
The Transmit and Receive fibers are swapped at the A500 or the TN230X
(but not both).
■
There is a break in the fiber.
■
The TN230X is not transmitting a carrier (not inserted, not powered, or not
administered). See
‘‘ATM-BCH (ATM B-Channel Trunk)’’ .
■
Hardware safety interlocks on optical transceivers may cut transmitter
power if no carrier is received, so lack of a receive carrier could indicate a
transmitter problem at the same end.
■
The A500 does not recognize that there is a port board in the slot. It may
be necessary to re-administer the A500 port boards. Refer to the Cajun
A500 Quick Reference for further information.
Recommended Action
1. Plug in, swap, repair, or replace the fiber as necessary.
2. Verify that the port board is inserted.
SONET Layer
Are SONET frames reaching the A500?
Is the A500 port’s green RX LED solid off, indicating no cell traffic?
1. Enter show stats sonet port on the A500 console. Screen 5-27 shows the
screen output.
NOTE:
The following examples point to port A1.2 as the port of interest.