08-17-2009 03:25 AM - edited 03-15-2019 07:24 PM
Hi,
is there anyone who can kindly show me when to use the network-clock-participate command?
Is it needed in a router with 2 VWIC BRI (2 ports) connected to the same provider?
Regards
Solved! Go to Solution.
08-17-2009 04:22 AM
As well network-clock-select, it's needed if you do fax or modem. Otherwise, it's recommended to have but no problems should occur if you don't.
08-18-2009 05:57 AM
If there are slips the best idea is to start doing loopback tests on the links. Make a T1 loopback cable (1-4, 2-5, hairpinned) and see if any of the sides are getting slips.
In your 4 examples, if all 4 BRI ports go to the same clocking domain, they will be equivalent. Many people like to use a preference of 2 in case one goes down as well.
-nick
08-17-2009 04:22 AM
As well network-clock-select, it's needed if you do fax or modem. Otherwise, it's recommended to have but no problems should occur if you don't.
08-17-2009 07:46 AM
Each set of DSPs have one clock. By default, the DSPs will be sync'd to the internal self-created clock.
Even when you configured 'clock source line', the DSPs choose the internal clock first.
If you have 2 PRIs for example, one to two different providers, you will be connected to two different 'clocking domains'. This command allows you to choose which timing you would like to sync to.
As long as both of your BRIs are on the same clocking domain, you should be fine. Use the network-clock-select command to choose your provider's clock for the DSPs to sync to.
If you do have slips, you can have slight clicks and pops on the line, as well as fax failures.
hth,
nick
08-18-2009 04:32 AM
Hi,
thanks for the reply.
So, if I have 2 VIC2-2BRI-NT/TE modules in the same router (interface BRI0/0/0
interface BRI0/0/1 interface BRI0/1/0 and
interface BRI0/1/1) all connected to the same provider, the following configurations are correct:
network-clock-participate wic 0
network-clock-participate wic 1
network-clock-select 1 BRI0/0/0
that is the same of
network-clock-participate wic 0
network-clock-participate wic 1
network-clock-select 1 BRI0/0/1
that is the same of
network-clock-participate wic 0
network-clock-participate wic 1
network-clock-select 1 BRI0/1/0
that is the same of
network-clock-participate wic 0
network-clock-participate wic 1
network-clock-select 1 BRI0/1/1
is it correct?
nick, is there a way to debug if there are slips?
08-18-2009 05:57 AM
If there are slips the best idea is to start doing loopback tests on the links. Make a T1 loopback cable (1-4, 2-5, hairpinned) and see if any of the sides are getting slips.
In your 4 examples, if all 4 BRI ports go to the same clocking domain, they will be equivalent. Many people like to use a preference of 2 in case one goes down as well.
-nick
08-18-2009 07:03 AM
You cannot do loopback tests on a BRI interface, neither in software nor using a crossed cable.
However, on BRI slips will show as CRC and other errors on the D-channel /0/x/y:0 consequently it's always recommended to use network-clock-select. The drawback is that will clutter your log a little.
Again I'd like to remind the OP to please rate useful posts with the scrollbox below.
08-18-2009 02:18 PM
thank you for your answers!
08-18-2009 02:37 PM
You're welcome, thank you for the nice rating and good luck.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide