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 rep resents one party of a compl ete
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 connec tions
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.
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
_________________________________________________________