Unusual Atm Trouble Conditions - Avaya S8700 Maintenance Manual

For multi-connect configurations

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Alarms, Errors, and Troubleshooting

Unusual ATM Trouble Conditions

There are a few failure modes in the S8700 Multi-Connect/A500 combination that

are particularly difficult to diagnose. One example might be that you can't make a

completely successful call, even though most indications from S8700

Multi-Connect and the A500 look pretty good. This section documents some hints

and clues that may help diagnose the following failure modes:

Incorrect EPN Route or End System Identifier (A500)

Swapped Routes, End System Identifiers, or Fiber between a PPN and an

Swapped Routes, End System Identifiers, or Fiber between A and B side

TN230Xs on an EPN

Swapped Routes, End System Identifiers, or Fiber between two EPNs

Incorrect EPN Route or End System Identifier

One-way talk paths from the PPN to an EPN. You can hear tones from the PPN's

end station to an EPN's end station, but not vice versa. Since a signaling channel

is a bidirectional VC established from the PPN to an EPN, these can be routed

correctly and come up just fine. However, a single call's talk path consists of two

unidirectional VCs — one from the PPN to an EPN (which is routed correctly) and

another from the EPN to the PPN (which cannot be routed).

1. At the A500 use the show signaling routes or show signaling esi

command(s) as appropriate to check the ATM addresses.

2. Use show signaling stats port q93b on the EPN port and look for cause

code 3 (No route to destination).

Correct the ATM address translations in the A500.

Issue 1 May 2002