Lucent Technologies 555-233-119 - page 159

DEFINITY ECS Release 8.2 Maintenance for R8.2csi 555-233-119 Issue 1
April 2000
Maintenance for csi systems
1-133Unusual ATM trouble conditions
1
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) establis hed 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 c all 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 inser tion.
■Dial tone is present on end stations on the PPN and on
correctly-connec ted EPNs, but no dial tone is present on the affec ted EPN
end stations.
■Calls cannot be made b etween the PPN and the correctly conne cted
EPNs, because talk paths cannot b e routed correctly.
Diagnostics
1. The show switch circuittable command on the A500 shows VBR control
channels from the A500 port intend ed for the incorrectly-c onnected EPN
(but actually connec ted logically or physically to the PPN) that should not
exist.