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 networ ks (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 comp lete talk path: one unidirectional
point-to-multipoint virtual c ircuit from A1.1 to A1.2, and another from
A1.2 to A1.1.
— These virtual circuits may persist b eyond the duration of a p hone
call. The DEFINITY Call Processing software saves virtual circuits
for a few seconds after the end stations have hung up in c ase the
VC can be used again for anot her call between the same two p ort
networks.
— In early version of the Release 2 A500 firmware, these connectio ns
incorrectly identified as pmp UBR.
— There may be other CBR virtual circuits betwee n A500 ports that
are not associated with DEFINITY port networks. A common CBR
application is Circ uit 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 diffic ult to diagnose. One examp le might be that you can ’t make a
completely succ essful call, even though mo st indications 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