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Community Member

E1 Clocking

Hello,

I have an MGCP gateway with 2 E1 PRI lines connected. One of them the slips and errors are incrementing. The clock source is line from the telco as per normal. I have also tried setting the clock source as internal but still there is a problem with clocking

Anything else I can try or do I need to report this to the telco?

There is one difference between the 2 PRI lines. One (E1 1/0 is a traditional e1 TDM circuit and the line with the error is a VOIP PRI i.e the E1 line is connected from my router E1 1/1 to the telco Cisco router E1 interface

CONFIG:

network-clock-participate slot 1

network-clock-select 1 E1 1/0

E1 1/0 is up.

  Applique type is Channelized E1 - balanced

No alarms detected.

  alarm-trigger is not set

  Version info Firmware: 20100222, FPGA: 255, spm_count = 0

  Framing is NO-CRC4, Line Code is HDB3, Clock Source is Line.

  Current port master clock:recovered from backplane

  Data in current interval (458 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 1 15 minute intervals):

     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

E1 1/1 is up.

  Applique type is Channelized E1 - balanced

No alarms detected.

  alarm-trigger is not set

  Version info Firmware: 20100222, FPGA: 255, spm_count = 0

  Framing is NO-CRC4, Line Code is HDB3, Clock Source is Line.

  Current port master clock:recovered from backplane

  Data in current interval (677 seconds elapsed):

     0 Line Code Violations, 0 Path Code Violations

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

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


7 REPLIES

E1 Clocking

You need to be clear who is the clock soure for interface 1/1. If you're not the clock source, then you need a "network-clock-select" command for the interface.

GTG

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Please rate all helpful posts.
Purple

E1 Clocking

Hi ,

can u share output of show network-clocks?

regds,

aman

Community Member

E1 Clocking

Hi Gordon,

I have tried putting network-clock-select 2 E1 1/1 but that doesnt make any difference...

Aman, show network-clocks:

Network Clock Configuration

  ---------------------------

  Priority      Clock Source    Clock State     Clock Type

     1          E1 1/0          GOOD            E1

     2          E1 1/1          GOOD            E1

    10          Backplane       GOOD            PLL

  Current Primary Clock Source

  ---------------------------

  Priority      Clock Source    Clock State     Clock Type

     1          E1 1/0          GOOD            E1

E1 Clocking

In which case, are you and the other end sure you know who is producing the clock?

GTG

Please rate all helpful posts.

Please rate all helpful posts.
Community Member

E1 Clocking

I was under the impression it was the telco providing the source but seeing as I am still getting errors hence my question earlier :

"Anything else I can try or do I need to report this to the telco?"

E1 Clocking

I'd speak to your Telco's tech support team.

GTG

Please rate all helpful posts.

Please rate all helpful posts.
Purple

E1 Clocking

Hi ,

Telco is the source of Clock provider.Also, in your config for E1 controller , u have configured Clock Source as Line which means take from External Source.

http://www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a00800f99bb.shtml

As suggested by Ross, speak to Telco.

regds,

aman

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