DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-47ATM Tips
5
Possible Causes
■The fiber is disconnected from the A500 and/or the TN230Xs.
■The Transmit and Receive fibers are swapped at the A500 o r 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 optic al transceivers may cut transmitter
power if no carrier is recei ved, so lack of a receive c arrier could indic ate a
transmitter problem at the same end .
■The A500 does not recognize that there is a p ort board in the slot. It may
be necessary to re-administer the A5 00 port boards. Refer to the

Cajun

A500 Quick Reference

for further information.
Recommended Action
1. Plug in, swap, repair, or replac e 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. Figure 5-27 shows the
screen output.
NOTE:
The following examples point to p ort A1.2 as the port of interest.