User manual

DEFINITY ECS Release 8.2 Maintenance for R8.2csi 555-233-119 Issue 1
April 2000
Maintenance for csi systems
1-132Unusual ATM trouble conditions
1
— The pmp CBR (Constant Bit Rate) virtual circuits (VCs) between
A500 port A1.1 (PPN) and A500 port A1.2 (EPN) are used for talk
paths between port networks (PPN to EPN, EPN to PPN, or EPN to
EPN).
— They are established when calls are first setup between port
networks. Each virtual circuit represents one party of a complete
multiparty talk path.
— The report above shows one complete talk path: one unidirectional
point-to-multipoint virtual circuit from A1.1 to A1.2, and another from
A1.2 to A1.1.
— These virtual circuits may persist beyond the duration of a phone
call. The DEFINITY Call Processing software saves virtual circuits
for a few seconds after the end stations have hung up in case the
VC can be used again for another call between the same two port
networks.
— In early version of the Release 2 A500 firmware, these connections
incorrectly identified as
pmp UBR
.
— There may be other CBR virtual circuits between A500 ports that
are not associated with DEFINITY port networks. A common CBR
application is Circuit Emulation, in which T-1, T-3, etc. circuits are
carried over ATM.
Unusual ATM trouble conditions
There are a few failure modes in the DEFINITY/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 DEFINITY and the
A500 look pretty good. This section documents some hints and clues 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