Clock synchronization issues for multiple PRI cards

[VAbr AVib]

Hi,

I have a voice router equiped with 2 T1-PRI cards(4 port & 2 port), currently having the PSTN connected to the 4-port PRI and the 2-port PRI connected to a voice conference device. In the global configurations the clock source given is the PSTN port 0/2/0, since i am getting some voice quality issues with the conference extension i just checked the port and then realized that there are errors in the controller connected to the audio conference device. How do i mention the clock source for this second card 0/1/0 ?

sh network-clocks

  Network Clock Configuration

  ---------------------------

  Priority      Clock Source    Clock State     Clock Type

      1          T1 0/2/0        GOOD            T1

      2          T1 0/2/1        GOOD            T1

     10          Backplane       GOOD            PLL

   Current Primary Clock Source

  ---------------------------

  Priority      Clock Source    Clock State     Clock Type

      1          T1 0/2/0        GOOD            T1

sh controllers T1 0/1/1

  Total Data (last 24 hours)

     305693818 Line Code Violations, 144 Path Code Violations,

     13293 Slip Secs, 0 Fr Loss Secs, 2 Line Err Secs, 0 Degraded Mins,

     13288 Errored Secs, 0 Bursty Err Secs, 2 Severely Err Secs, 43712 Unavail Secs

sh controllers T1 0/2/0

Total Data (last 24 hours)

   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

[islam.kamal]

Hi

please use the below command

network-clock-participate wic 2

thank you

please rate if this will help

[Chris Deren]

He must have network participate already in otherwise he could not have configured the PRI.

Please post your full config and are all 4 circuits from PSTN from the same carrier?

Basically you want to clock of the PSTN in selected order, but the conferencing device should only participate in clocking and run line clock.

HTH,

Chris

[VAbr AVib]

3 ports in Card-1 is connected to PRI, 1 to Conference. The second card, 2 ports connected to conference.

Please find the PRI configurations below.

card type t1 0 1

card type t1 0 2

clock timezone EST -5 0

clock summer-time EDT recurring

network-clock-participate wic 1

network-clock-participate wic 2

network-clock-select 1 T1 0/2/0

network-clock-select 2 T1 0/2/1

controller T1 0/1/0

cablelength long 0db

pri-group timeslots 1-24

description Conference

!

controller T1 0/1/1

cablelength long 0db

pri-group timeslots 1-24

description Conference

!

controller T1 0/2/0

cablelength long 0db

pri-group timeslots 1-24

!

controller T1 0/2/1

cablelength long 0db

pri-group timeslots 1-24

!

controller T1 0/2/2

cablelength long 0db

pri-group timeslots 1-24

description Conference

!

controller T1 0/2/3

cablelength long 0db

pri-group timeslots 1-24

!

interface Serial0/1/0:23

no ip address

encapsulation hdlc

isdn switch-type primary-ni

isdn incoming-voice voice

no cdp enable

!

interface Serial0/1/1:23

no ip address

encapsulation hdlc

isdn switch-type primary-ni

isdn incoming-voice voice

no cdp enable

!

interface Serial0/2/0:23

no ip address

encapsulation hdlc

isdn switch-type primary-ni

isdn incoming-voice voice

no cdp enable

!

interface Serial0/2/1:23

no ip address

encapsulation hdlc

isdn switch-type primary-ni

isdn incoming-voice voice

no cdp enable

!

interface Serial0/2/2:23

no ip address

encapsulation hdlc

isdn switch-type primary-ni

isdn incoming-voice voice

no cdp enable

!

interface Serial0/2/3:23

no ip address

encapsulation hdlc

isdn switch-type primary-ni

isdn incoming-voice voice

no cdp enable

[Chris Deren]

I am assuming that the conferencing system is on-prem solution of some kind, in either case this setup will cause issues as you are clocking of off PSTN and also try to clock off of the conference since it is on the same card and in fact all cards in HWIC slots are on the same clocking domain.  The only sure way of fixing this is to get HDV card which would separate the clocking and put the conference PRIs on it.  You can try separating conference PRIs from PSTN PRIs onto separate VWIC cards but again the motherboard is a single clocking domain.

HTH,

Chris

[VAbr AVib]

chris,

So you mean i dont have a straight forward option to fix all my clock sync errors ? Please find the controller status below, few of them have errors or slip secs and i beleive the slip secs is because of clock syn issues.

sh controllers T1 0/2/0 (PRI)

Total Data (last 4 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

sh controllers T1 0/2/1 (PRI)

Total Data (last 4 15 minute intervals):

   0 Line Code Violations, 0 Path Code Violations,

   2833 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

sh controllers T1 0/2/2 (Conf)

Total Data (last 4 15 minute intervals):

   0 Line Code Violations, 0 Path Code Violations,

   1725 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

sh controllers T1 0/2/3 (PRI)

Total Data (last 4 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

sh controllers T1 0/1/0 (Conf)

Total Data (last 4 15 minute intervals):

   0 Line Code Violations, 0 Path Code Violations,

   1180 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

   1180 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

sh controllers T1 0/1/1 (Conf)

Total Data (last 4 15 minute intervals):

   0 Line Code Violations, 0 Path Code Violations,

   1180 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

   1180 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

[Ayodeji Okanlawon]

Following up on Chris thoughts...What type of device is the conference station..Does it have its own clock source? Can you change the clock source on it such that its taking clocking from the PRI since the PRI is already sourcing its own clock from the PSTN

Please rate all useful posts

"opportunity is a haughty goddess who waste no time with those who are unprepared"

[VAbr AVib]

The conference device we have is the POLYCOM MGC-50, let me check whether this device can source the clock from the router PRI.

Hope this will help us to fix the issue.

[Ayodeji Okanlawon]

Section 5-139 talks about clocking..Check what yours is set to

http://supportdocs.polycom.com/PolycomService/support/global/documents/support/user/products/network/mgc_admin_guide_v90.pdf

Please rate all useful posts

"opportunity is a haughty goddess who waste no time with those who are unprepared"