topic PRI backplane clock source in Routing and SD-WAN

PRI backplane clock source

Muralidharan.p — Mon, 04 Mar 2019 21:52:40 GMT

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,

Re: PRI backplane clock source

Ronit Bhattacharjee — Mon, 10 Oct 2011 11:40:42 GMT

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.

Re: PRI backplane clock source

Muralidharan.p — Mon, 10 Oct 2011 11:54:42 GMT

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?

Re: PRI backplane clock source

Ronit Bhattacharjee — Mon, 10 Oct 2011 11:58:33 GMT

Hi Murali,

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

PRI backplane clock source

Muralidharan.p — Mon, 10 Oct 2011 12:01:34 GMT

Thanks a lot Ronit, let me check with provider.

PRI backplane clock source

Muralidharan.p — Mon, 10 Oct 2011 12:04:56 GMT

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.

Re: PRI backplane clock source

Ronit Bhattacharjee — Mon, 10 Oct 2011 12:10:03 GMT

Hi Murali,

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

PRI backplane clock source

Muralidharan.p — Tue, 11 Oct 2011 07:15:20 GMT

Hi Ronit,

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