Avaya S8700 Maintenance Manual page 121

ATM Tips
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 signal (not inserted, not powered,
or not administered). See
8-168.
If no carrier signal is received, an optical transceiver's hardware-safety
interlocks may cut transmission power. So, a transmission problem could
indicate an unreceived carrier signal 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.
4-48
NOTE:
The following examples point to port A1.2 as the port of interest.
555-233-143
''ATM-BCH (ATM B-Channel Trunk)'' on page
shows the screen output.
Figure 4-27 on page
Issue 1 May 2002 4-47