Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 
Community Member

network clock participate and clock source internal

I have 2 NM-HDV T1 modules(total 4 t1s), 2*T1 configured for voice, the other 2*T1 configured as data T1. Now we see some slips on 1 of the data T1.We know that slip on data is not critical. We decided to add data t1 into network clock participate command so that it use the clock from voice T1. My question is:

there used to be clock source internal. I think if we use participate command, this command not needed. I believe this command is more for old ways. right?

Hall of Fame Super Gold

Re: network clock participate and clock source internal


the thing is that T1s connected to circuits should use external clock, lines locally connected should use internal or external depending on the connected equipment.

Then the config in which you are getting clock from one line to feed the other, is not said at all that would fix the problem.In theory, it would if and only the slipping circuit, has free running clock that is synchronous to the one used for feeding.

What paltform are you using ? At the end show network-clocks will tell you clock is routed in the box.


Re: network clock participate and clock source internal

Try using "clock source line independent", if you have a 2-port VMIC-MFT and the T1s are from different providers that could possible explain the slips. One note if you do use this command you will have to remove any channelgroups you may have alread configured.

Check out this link for more clocking information:

CreatePlease to create content