[cisco-voip] ISR G2 PVDM3 DSPs on backplane

Tue Jun 29 10:05:13 EDT 2010

This may be helpful, but it's not as precise as the email thread:
http://www.cisco.com/en/US/docs/ios/12_3t/12_3t7/feature/guide/hdd_vfnm.html#wp1072796

On Tue, Jun 29, 2010 at 9:56 AM, Bill <bill at hitechconnection.net> wrote:
> Thanks for everyone's input. I don't believe in doing things cheap on the
> front end only to have problems down the road and look like the bad guy. I
> will just split the PRI's to different routers. Does anyone have any
> official documentation from Cisco that this is not supported or recommended?
> That will go along way in justifying the additional hardware.
>
> -----Original Message-----
> From: Dennis Heim [mailto:Dennis.Heim at cdw.com]
> Sent: Tuesday, June 29, 2010 8:54 AM
> To: Nick Matthews; Bill Riley
> Cc: cisco-voip
> Subject: RE: [cisco-voip] ISR G2 PVDM3 DSPs on backplane
>
> It is just bad design practice to get into to have PRIs from different
> provider on the same clocking domain. You might be able to get away with it,
> but really you are just putting the end-customer in a bad spot down the
> road.
>
> Dennis Heim
> Network Voice Engineer
> CDW  Advanced Technology Services
> 11711 N. Meridian Street, Suite 225
> Carmel, IN  46032
>
> 317.569.4255 Office
> 317.569.4201 Fax
> 317.694.6070 Cell
> dennis.heim at cdw.com
> cdw.com/content/solutions/unified-communications/
>
>
> -----Original Message-----
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Nick Matthews
> Sent: Monday, June 28, 2010 11:27 PM
> To: Bill Riley
> Cc: cisco-voip
> Subject: Re: [cisco-voip] ISR G2 PVDM3 DSPs on backplane
>
> I've seen this dozens of times.  Most people probably don't even realize
> they have a problem.  Some may even have two providers that have managed to
> be on the same clocking domain.  I've even seen some people with providers
> that were willing to be the slave because the provider is SIP on the other
> side of the router.
>
> The only way to provide two different voice clocking domains is by having
> two separate groups of DSPs - this means HDV cards.
>
> If you have one PRI for failover or that is not used until the first is
> filled, you can probably get away with slips.  The basic rule I've gone by
> is:  if you don't need to fax or modem over the T1, you're probably alright
> with slips if it's not your primary line.  There are chances for voice
> quality, it all depends.  It could be a cell-phone like quality issue you
> probably won't notice, or distinct chirps on the line that can be annoying.
>
> -nick
>
> On Mon, Jun 28, 2010 at 8:38 PM, Bill Riley <bill at hitechconnection.net>
> wrote:
>> 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.
>>
>> _______________________________________________
>> cisco-voip mailing list
>> cisco-voip at puck.nether.net
>> https://puck.nether.net/mailman/listinfo/cisco-voip
>>
>>
>
> _______________________________________________
> cisco-voip mailing list
> cisco-voip at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>
>