Avaya MCC1 Maintenance Procedures page 198

Troubleshooting
Troubleshooting ATM
Are talk paths being established between PNs?
Diagnostics
• Can you talk both ways on a set on one PN dialed from another PN, and vice versa?
1 Enter show switch circuit on the A500 console.
page 198 shows the screen output.
Figure 56: A500:show switch circuit screen
A500:show switch circuit
_______________________________________________________
| Input
| port vpi
|______________|______________|_________________________|
A1.1
A1.1
A1.1
A1.2
A1.2
A1.2
Self
Self
_________________________________________________________
— The pmp Constant Bit Rate (CBR) virtual circuits (VCs) between A500 port A1.1 (PPN)
and A500 port A1.2 (PN) are used for talk paths between PNs.
— They are established when calls are first setup between PNs. 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 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 PNs.
— 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 PNs. A common CBR application is circuit emulation, where T1,
T3, etc. circuits are carried over ATM.
198
| Output |
vci| port vpi vci| type class
0 5 Self 0 1
0 32 A1.2 0 32
0 35 A1.2 0 35
0 5 Self 0 2
0 32 A1.1 0 32
0 34 A1.1 0 34
0 1 A1.1 0 5
0 2 A1.2 0 5
Figure 56, A500:show switch circuit screen,
Connection
parameters
pp UBR ppd on
pp VBRnrt pcr=5729 /scr=5729
pmp CBR pcr=173
pp UBR ppd on
pp VBRnrt pcr=5729 /scr=5729
pmp CBR pcr=173
pp UBR ppd on
pp UBR ppd on
on
|
|
/mbs=17187
/mbs=17187
Maintenance Procedures
December 2003