[cisco-voip] ISR G2 PVDM3 DSPs on backplane

[Beck, Christopher]

This is true on the 2800/3800 today (except in the case of the NM-NDV modules mentioned, but I don't think so even in that case).  It is because there is a "single" PLL clocking circuit shared for all PRI's.  The WIC must be configured to participate in that clocking circuit prior to setting up the PRI.   I can't remember  any device that could handle this in 20 years of installing channel banks, muxes, routers, etc.

That said, a lot of times it will work acceptably because the clocks are close enough, especially if the local loop provider is the same on all links.  But, you have to test it to know in any case.


-Chris

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Bill
Sent: Monday, June 28, 2010 4:21 PM
To: 'Jason Aarons (US)'; 'cisco-voip'
Subject: Re: [cisco-voip] ISR G2 PVDM3 DSPs on backplane

What? I know you could not do different Telco's on the same two port card but you can't do two telco's in the same router? Is there an official response to this? Is there a specific defect I can reference with my Cisco AM?

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From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Jason Aarons (US)
Sent: Monday, June 28, 2010 4:12 PM
To: cisco-voip (cisco-voip at puck.nether.net)
Subject: [cisco-voip] ISR G2 PVDM3 DSPs on backplane

A TAC engineer at Cisco Live confirmed you can't have multiple voice PRIs from separate telcos come into a G2 with different clocks. For example you have a AT&T PRI, a Verizon PRI, a Century Link PRI, a Alltell PRI, a Paetec PRI all in the same router. You can't clock the backplane to  more than one source!  You'll get slips, etc audio will sound bad, faxes/modems will fail.  Fix is separate routers.  He said he thought a 2800 with DSPs on a NM-HDV module would work though.  My exact question was can you carve up the backplane PVDM3 clocking for separate PRIs somehow.
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