04-12-2008 05:29 AM - edited 03-15-2019 10:01 AM
I have a Cisco 2821 that is getting two different T1 clocks from different providers. The Cisco 2821 has a VWIC2-2MFT-T1/E1 wic card. 1 t1 on the card is data, 1 is a voice PRI.
I am trying to figure out this proper configuration for this, I was thinking that this configuration would be correct:
network-clock-participate wic 1
network-clock-select 1 T1 0/0/1
!
controller T1 0/0/0
framing esf
clock source line independent
linecode b8zs
channel-group 0 timeslots 1-24
description MPLS Circuit
!
controller T1 0/0/1
framing esf
linecode b8zs
pri-group timeslots 1-24 service mgcp
description Voice PRI Circuit
!
IT is my understanding that you need to have network-clock-participate ON when using a voice gateway. The problem with the above config is this:
(config-controller)# clock source line independent
%Please remove network-clock-participate wic 0 first
How should this be configured?
04-12-2008 05:36 AM
Hi, in most countries, properly set networks are synchronous to the same master source, so is not said you necessarily need independent clocking. So check first if you're getting slips with normal clocking.
Then in your example the wic in network-clock-participate should be 0, not 1.
Finally if you want to try independent clocking, follow router advice and remove the wic-pariticpate first.
04-12-2008 06:20 AM
I can try again at later.. i was using wic 0, not wic 1, that was a typo.
04-12-2008 06:23 AM
I have also run into this issue when trying it without network-clock-participate
# pri-group timeslots 1-24 service mgcp
%Please configure network-clock-participate wic 0 first
Perhaps, having network-clock-participate and both set to clock source line, no t1s set to independent is the key? I can not test this at the moment
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