07-31-2012 11:22 AM - edited 03-04-2019 05:07 PM
Hi,
I'm going to be replacing a few 1760's with new 1921's. There's a main site and two branches. The original configs puzzle me because I assume both T-1's at the main site are the same provider, but one is clock sourced internal and the other isn't.
Main site Wan
interface Serial0/0
description ****Link to P Branch****
ip address 192.168.150.1 255.255.255.252
ip nbar protocol-discovery
ip route-cache flow
service-module t1 timeslots 1-24
service-policy output voice
!
interface Serial0/1
description ****Link to A Branch****
ip address 192.168.150.5 255.255.255.252
ip nbar protocol-discovery
ip route-cache flow
service-module t1 clock source internal
service-module t1 timeslots 1-24
service-policy output voice
On the branch sites I have this
P-Branch
interface Serial0/0
description ****Link to Main Site****
ip address 192.168.150.2 255.255.255.252
ip nbar protocol-discovery
service-module t1 timeslots 1-24
service-policy output voice
A-Branch
interface Serial0/0
description ****Link to Main Site****
ip address 192.168.150.6 255.255.255.252
service-module t1 timeslots 1-24
service-policy output voice
Why would the main site T-1's be clocked differently. How should this be setup. I thought most T-1 setups derived clock from the line not internal.
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07-31-2012 11:23 AM
That is because some circuit can be provisioned to transport clock trasparently, so if not error and slips, that is fine.
07-31-2012 11:23 AM
That is because some circuit can be provisioned to transport clock trasparently, so if not error and slips, that is fine.
07-31-2012 11:41 AM
Thanks.
But it cannot be internal on both ends, right?
I got the 1921's from another engineer and I believe he was doing loopback testing so the new configs have internal clock on both the main site and the branch sites.
07-31-2012 12:14 PM
Correct, cannot be internal on both sides.
Thank you for the nice rating and good luck!
07-31-2012 12:37 PM
Depending on the circuit, which of these combinations on matched ends are correct?
clock not specified, clock not specified
internal, clock not specified
internal, line
line, clock not specified
07-31-2012 01:36 PM
There is no such setting as "clock not specified", when nothing is specified the default of "clock source line" is applied.
The two valid combinations are both sides line, or one side internal and the other line.
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