[cisco-voip] Question about T1 clocking

[Ed Leatherman]

I did read through that particular thread actually, and it sorta prompted my
question in the first place. Mainly, is JUST adding another MFT card enough
due to the clocking on the DSPs as well. One of the first things I do when
I'm researching something is googling this mailing list actually.

the 'independent' command referred to in the thread seems to only work for
data, since it doesn't cover the clocking on the on-board PVDM's.. Or so I
thought anyway.

On Wed, Feb 4, 2009 at 5:08 PM, Jason Aarons (US) <
jason.aarons at us.didata.com> wrote:

>  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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> cisco-voip at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>
>
>
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-- 
Ed Leatherman
Assistant Director, Voice Services
West Virginia University
Telecommunications and Network Operations
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