ATM Tips
Issue 1 May 2002
4-57555-233-143
Figure 4-36. A500:show switch circuit screen
— The pmp Constant Bit Rate (CBR) virtual circuits (VCs) between
A500 port A1.1 (PPN) and A500 port A1.2 (EPN) are used for talk
paths between EPNs (PPN to EPN, EPN to PPN, or EPN to EPN).
— They are established when calls are first setup between EPNs.
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 S8700 Multi-Connect call-processing software saves
virtual circuits for a few seconds after the end stations have hung
up, in case the VC can be reused for another call between the same
two EPNs.
— 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 S8700 Multi-Connect EPNs. A common CBR
application is circuit emulation, where T1, T3, 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
_________________________________________________________
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