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PRI backplane clock source

Muralidharan.p
Level 1
Level 1

Hi All,

We are having 2 PRI controllers, Slip sec in both the controllers are keep on increasing. The clock source is configured as "line", show network-clock showing the clock source as backplane. I dont know what is backplane clock soure and  i dont know which one is the primary controller for clock soure. Below are the ouput for your reference. I guess the configuration is not completed for clock source. Please advise. Thanks in advance.

E1 0/0/0 is up.

  Applique type is Channelized E1 - balanced

  No alarms detected.

  alarm-trigger is not set

  Version info Firmware: 20100222, FPGA: 13, spm_count = 0

  Framing is CRC4, Line Code is HDB3, Clock Source is Line.

  Data in current interval (752 seconds elapsed):

     0 Line Code Violations, 0 Path Code Violations

     16 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

     16 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,

     1816 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

     1816 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

E1 0/0/1 is up.

  Applique type is Channelized E1 - balanced

  No alarms detected.

  alarm-trigger is not set

  Version info Firmware: 20100222, FPGA: 13, spm_count = 0

  Framing is CRC4, Line Code is HDB3, Clock Source is Line.

  Data in current interval (755 seconds elapsed):

     0 Line Code Violations, 0 Path Code Violations

     16 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

     16 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,

     1816 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

     1816 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

-------------------------------------------------------

controller E1 0/0/0
pri-group timeslots 1-31 service mgcp
!
controller E1 0/0/1
pri-group timeslots 1-31 service mgcp

!

-----------------------------------------------------

  Network Clock Configuration
  ---------------------------
  Priority      Clock Source    Clock State     Clock Type

    10          Backplane       GOOD            PLL        

  Current Primary Clock Source
  ---------------------------
  Priority      Clock Source    Clock State     Clock Type

    10          Backplane       GOOD            PLL 

------------------------------------------------------

#sh run | in network

network-clock-participate wic 0

thanks,

1 Accepted Solution

Accepted Solutions

PRI controllers need to derive the clock from the backplane so that the E1 is synced to the PVDMs. Unfortunately, in this case, both E1 lines cannot operate independently. Add this to the config

"network-clock-select 1 e1 0/0/0"

"network-clock-select 2 e1 0/0/1"

After this, do a "clear controller e1". This would cause both controllers to dervice their clocking from the backplane, which in turn will now derive clocking from the lines. Look at this for reference

http://www.cisco.com/en/US/docs/ios/12_3t/voice/command/reference/vrht_n1_ps5207_TSD_Products_Command_Reference_Chapter.html#wp1017019

If both lines are from the same provider, both will be cleared of the errors, otherwise, only the 1st would be.

View solution in original post

7 Replies 7

PRI controllers need to derive the clock from the backplane so that the E1 is synced to the PVDMs. Unfortunately, in this case, both E1 lines cannot operate independently. Add this to the config

"network-clock-select 1 e1 0/0/0"

"network-clock-select 2 e1 0/0/1"

After this, do a "clear controller e1". This would cause both controllers to dervice their clocking from the backplane, which in turn will now derive clocking from the lines. Look at this for reference

http://www.cisco.com/en/US/docs/ios/12_3t/voice/command/reference/vrht_n1_ps5207_TSD_Products_Command_Reference_Chapter.html#wp1017019

If both lines are from the same provider, both will be cleared of the errors, otherwise, only the 1st would be.

Great, thanks for the reply Ronit. Can you confirm me whether the provider also need to be configure the controller e1 0/0/0 as primary?

Hi Murali,

The only thing the provider needs to do is make sure both lines have synchronized clocking.

Thanks a lot Ronit, let me check with provider.

Ronit, one quick question, whether the command "network-clock-select 1 e1 0/0/0" will reset the PRIs? This is the besiness hrs for us.

Hi Murali,

It might. I am not sure. I would recommend that you try this after-hours or during a break/maintenance-window.

Hi Ronit,

Thaks a lot for the help, the issue has been resolved. FYI the controller was not reset while applying the config.

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