[cisco-voip] ISR G2 PVDM3 DSPs on backplane

[Bill Riley]

I am not concerned with what works, and more concerned with what is the best
solution. 

 

From: Jason Aarons (US) [mailto:jason.aarons at us.didata.com] 
Sent: Monday, June 28, 2010 5:25 PM
To: Jim Reed; Bill; Beck, Christopher; cisco-voip
Subject: RE: [cisco-voip] ISR G2 PVDM3 DSPs on backplane

 

While it's working, from a solution design standpoint I'm being told that if
the timing varies from the providers it could result in problems, so design
preference should be to have separate routers in this scenario. 

 

I'm with you, I've done it before and it did work, and I'd hate to explain
it to customer they need another router if the clocks are far apart.

 

From: Jim Reed [mailto:jreed at swiftnews.com] 
Sent: Monday, June 28, 2010 6:09 PM
To: Bill; Beck, Christopher; Jason Aarons (US); cisco-voip
Subject: Re: [cisco-voip] ISR G2 PVDM3 DSPs on backplane

 

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)
Sorry, no faxes accepted.
Please send documents by eMail.



On 6/28/10 3:44 PM, "Bill" <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.
 

  _____  

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] 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? 
 

  _____  

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. 

  _____  


Disclaimer: This e-mail communication and any attachments may contain
confidential and privileged information and is for use by the designated
addressee(s) named above only. If you are not the intended addressee, you
are hereby notified that you have received this communication in error and
that any use or reproduction of this email or its contents is strictly
prohibited and may be unlawful. If you have received this communication in
error, please notify us immediately by replying to this message and deleting
it from your computer. Thank you. 

Confidentiality Notice: This email is intended for the sole use of the
intended recipient(s) and may contain confidential, proprietary or
privileged information. If you are not the intended recipient, you are
notified that any use, review, dissemination, copying or action taken based
on this message or its attachments, if any, is prohibited. If you are not
the intended recipient, please contact the sender by reply email and destroy
or delete all copies of the original message and any attachments. Thank you.

 

  _____  

Disclaimer: This e-mail communication and any attachments may contain
confidential and privileged information and is for use by the designated
addressee(s) named above only. If you are not the intended addressee, you
are hereby notified that you have received this communication in error and
that any use or reproduction of this email or its contents is strictly
prohibited and may be unlawful. If you have received this communication in
error, please notify us immediately by replying to this message and deleting
it from your computer. Thank you. 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20100628/e3571da8/attachment.html>