[cisco-voip] Question about T1 clocking

[Jason Aarons (US)]

The VWIC2-2MFT-T1/E1 has a single PLL for voice clocking.  You would
need add another MFT card if you have two different clock source.  

 

Workarounds include sending clock to telco, etc.

 

letmegooglethatforyou didn't return the right results;

 

http://www.gossamer-threads.com/lists/cisco/nsp/86462

 

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Bill Talley
Sent: Wednesday, February 04, 2009 5:00 PM
To: Ed Leatherman
Cc: Estes, Timothy; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Question about T1 clocking

 

Doesn't the VWIC2 allow for different clock sources for each port, that
is, independent clocking for each port?

 

 

 

On Wed, Feb 4, 2009 at 1:18 PM, Ed Leatherman <ealeatherman at gmail.com>
wrote:

My main concern is since both these are voice connections and they will
be faxing over both links.. clock slips seem to cause trouble in that
regard. Would adding the second VWIC eliminate the slip problem? 

 

On Wed, Feb 4, 2009 at 9:52 AM, Estes, Timothy
<TimothyEstes at spherion.com> wrote:

I have this running on about 90 28XX routers in the field. Sprint MPLS
circuits on the data side and Verizon or AT&T PRIs. You have to set
network clock select to the PRI for it to come up, therefore the data
circuit slips. Out of the 90 sites, only 2 have required new VWICs
because of errors. The rest tolerate the slips. I see as low as 15 and
as many as 90 slip seconds on the data circuits. 40 or 50 seems to be
the limit for me, your mileage may vary.

 

 

 

Timothy Estes

Data Network Operations Engineer

ACS / Spherion

Ft. Lauderdale FL





-- 
Ed Leatherman
Assistant Director, Voice Services
West Virginia University
Telecommunications and Network Operations


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