DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-57Unusual ATM trouble conditions
5
Unusual ATM trouble conditions
There are a few failure modes in the DEFINITY/A500 combination that are
particularly diffic ult to diagnose. One examp le might be that you can’t make a
completely succ essful call, even though most ind ications from DEFINITY and the
A500 look pretty good. This sectio n documents some hints and c lues that may
help diagnose the following failure modes:
■Incorrectly typed or omitted EPN Route or End System Identifier (A500)
■Swapped Routes, End System Identifiers, or Fiber between a PPN and an
EPN
■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

Incorrectly typed or omitted EPN Route or End

System Identifier (A500)

Symptoms
Talk paths are one-way, from the PPN to the EPN: you can hear tones from the
PPN end station to the EPN end station but not vice versa. Because th e signaling
channels are bidirec tional virtual circuits (VCs) established from the PPN to the
EPN, these can be routed correctly and come up just fine. Talk paths are two
unidirectional virtual c ircuits, so a single call has one VC from the PPN to the EPN
(which is routed correc tly) and one VC from the EPN to the PPN (which cannot be
routed).
Diagnostics
1. At the A500 use the show signaling routes or show signaling esi
command(s) as app ropriate 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).
Action
1. Correct the ATM address translations in the A500.
Swapped Routes, End System Identifiers, or Fiber

between a PPN and an EPN

Symptoms
■An incorrectly-connec ted EPN TN230X does not complete board insertion.