[cisco-voip] ISR G2 PVDM3 DSPs on backplane

Mon Jun 28 19:59:10 EDT 2010

This is an example of what I said had seen work in my earlier post.  Your config has both PRI's working with the PLL circuit (network-clock-participate commands) and the network-clock-select command picks one to be the source clock.  You are seeing errors because the clocks are really uniform between the T1s.

The only way I can think of running multiple providers into 1 router, and not having a clocking issue, would be to either:
1)  utilize an NM module that provides it's own PLL circuit, thus creating multiple clocks in the system that were distinct from each other.  You would still have the potential for errors on any one clocking circuit, but it would be isolated.
2)  utilize something like a DS3 as an aggregate local loop for all the PRIs.  The master clock for all circuits would be the DS3, regardless of the providers involved, and any resulting issues would be resolved in the network and not in your CPE.

Researching a bit more, the VWIC2 support separate clocks for DATA applications but not VOICE.  http://www.cisco.com/en/US/customer/prod/collateral/routers/ps5855/prod_qas0900aecd8028d2e5.html

Chris

On Jun 28, 2010, at 5:08 PM, Jim Reed wrote:

I am currently using PRIs from different vendors — AT&T and Integra — on the same router.  Two (2) separate VWICs on the same 2851.  VWIC2-1MFT-T1/E1.  No problems with voice quality, errors, etc.  Configured as follows:
network-clock-participate wic 0
network-clock-participate wic 1
network-clock-select 1 T1 0/0/0
Just thought I’d pass it along.
--
Jim Reed
Manager of Technical Services
Swift Communications, Inc.
970-384-9141 (Direct)
775-772-7666 (Cell)
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Please send documents by eMail.

On 6/28/10 3:44 PM, "Bill" <bill at hitechconnection.net<mailto:bill at hitechconnection.net>> wrote:

Are you sure that is the case currently? I think you can have multiple PRI’s inside the same router on an ISR but they can not be on the same VWIC.

Jason said you can not have multiple PRI’s within the same router.

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From: Beck, Christopher [mailto:CBeck at usg.com]
Sent: Monday, June 28, 2010 4:40 PM
To: Bill; 'Jason Aarons (US)'; 'cisco-voip'
Subject: RE: [cisco-voip] ISR G2 PVDM3 DSPs on backplane

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> [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> [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<mailto: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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