05-18-2009 08:34 AM - edited 03-17-2019 09:44 PM
My branch office's using a NEC PBX E1 R2 signaling connect to Cisco 2811 and through MPLS VPN communicate with central site.The central site has a NEC PBX too,but it using E&M signaling.when branch send fax to central site the session always failure, and the fax machine promt "communication error".i tryed cisco fax relay,T38 and passthrough,and no vad,no echo canceling enable Command, use G.711 codec etc.,it also dons't work.Please help me.
05-18-2009 08:45 AM
Are you providing clock on the 2811 ?
Please send "show controllers E1" ?
05-18-2009 06:19 PM
Gaobu-VG#show controllers e1
E1 0/0/0 is up.
Applique type is Channelized E1 - balanced
Cablelength is Unknown
No alarms detected.
alarm-trigger is not set
Version info Firmware: 20071011, FPGA: 13, spm_count = 0
Framing is NO-CRC4, Line Code is HDB3, Clock Source is Line.
Data in current interval (635 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
622 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
622 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 24 hours)
0 Line Code Violations, 0 Path Code Violations,
84795 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
84795 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
The clock source is External(NEC PBX)
05-18-2009 07:04 PM
If you are positive about the PBX providing good clock, configure:
network-clock-participate wic 0
network-clock-select 1 e1 0/0/0
That should eliminate the slip errors and fix you issue.
05-18-2009 11:26 PM
I apply this command on my branch router,the slip errors has eliminated.
on my central router config is:
network-clock-participate wic 0
network-clock-participate wic 1
05-18-2009 11:30 PM
LM-2811-HK#show controllers t1
T1 0/0/0 is up.
Applique type is Channelized T1
Cablelength is short 110
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Version info Firmware: 20071011, FPGA: 13, spm_count = 0
Framing is SF, Line Code is AMI, Clock Source is Line.
CRC Threshold is 320. Reported from firmware is 320.
Data in current interval (77 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
8 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
8 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
T1 0/1/0 is up.
Applique type is Channelized T1
Cablelength is short 110
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Version info Firmware: 20071011, FPGA: 13, spm_count = 0
Framing is SF, Line Code is AMI, Clock Source is Line.
CRC Threshold is 320. Reported from firmware is 320.
Data in current interval (75 seconds elapsed):
1 Line Code Violations, 0 Path Code Violations
8 Slip Secs, 0 Fr Loss Secs, 1 Line Err Secs, 0 Degraded Mins
9 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
The center T1 status
05-19-2009 08:48 AM
Still slip errors, possibly you have not configured network-clock-select as indicated baove.
05-19-2009 06:40 PM
E1 0/0/0 is up.
Applique type is Channelized E1 - balanced
Cablelength is Unknown
No alarms detected.
alarm-trigger is not set
Version info Firmware: 20071011, FPGA: 13, spm_count = 0
Framing is NO-CRC4, Line Code is HDB3, Clock Source is Line.
Data in current interval (283 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 76 15 minute intervals):
9 Line Code Violations, 8 Path Code Violations,
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 10 Unavail Secs
The slip is eliminated,and fax works normal..
but this morning,it occur error again.E1 status as indicated above(After config netowrk-clock)
05-20-2009 05:47 AM
Are you using fax relay currently ?
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