DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-56ATM Tips
5
Figure 5-36. A500:show switch circuit screen
— 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.
A500:show switch circuit
_______________________________________________________
| Input | Output | Connection |
| port vpi vci| port vpi vci| type class parameters |
|______________|______________|_________________________|
A1.1 0 5 Self 0 1 pp UBR ppd on
A1.1 0 32 A1.2 0 32 pp VBRnrt pcr=5729 /scr=5729 /mbs=17187
A1.1 0 35 A1.2 0 35 pmp CBR pcr=173
A1.2 0 5 Self 0 2 pp UBR ppd on
A1.2 0 32 A1.1 0 32 pp VBRnrt pcr=5729 /scr=5729 /mbs=17187
A1.2 0 34 A1.1 0 34 pmp CBR pcr=173
Self 0 1 A1.1 0 5 pp UBR ppd on
Self 0 2 A1.2 0 5 pp UBR ppd on
_________________________________________________________
