[cisco-voip] PVDMs, DSP farms, et al.... next steps?

Wed Apr 25 10:27:12 EDT 2012

Any idea if there is a command that you can use to show what DSP resources have been reserved for this? 

--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (ANNU) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 

----- Original Message -----
From: "Erick Wellnitz" <ewellnitzvoip at gmail.com> 
To: "Lelio Fulgenzi" <lelio at uoguelph.ca> 
Cc: "ccieid1ot" <ccieid1ot at gmail.com>, "cisco-voip voyp list" <cisco-voip at puck.nether.net> 
Sent: Wednesday, April 25, 2012 10:24:05 AM 
Subject: Re: [cisco-voip] PVDMs, DSP farms, et al.... next steps? 

In my experience I have never been able to 'oversubscribe' DSP resources so that is true. I believe, and someone please correct me if I am off on this, DSPs are 'reserved' when the T1/PRI interface is turned up. So, if you had an interface configured as a 'hot' standby in case your primary PRI port goes bad, it would use DSP resources. 

Think of the consequences of being able to do overprovision. If you have conferencing, MTP, transcoding and 8 PRIs configured and all of your DSPs are in use for conference and MTP, you are going to be in trouble when people start complaining they can't make or receive calls to/from the PSTN. 

On Wed, Apr 25, 2012 at 8:51 AM, Lelio Fulgenzi < lelio at uoguelph.ca > wrote: 

Thanks for this. A couple of more questions: 

I read that you have to have enough DSP resources for all your voice ports (T1s in particular) and you can't overprovision. Just wondering the validity of this statement (from NetPro post) and whether this is for cards that are inserted, or turned up. 

Also, with respect to codecs, can you configure different codecs on the same DSP? It talks about FLEX for the PVDMs, and I'm just wondering if that's the best approach. 

Thanks again for everyone's help. 

Lelio 

--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (ANNU) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 

From: "ccieid1ot" < ccieid1ot at gmail.com > 
To: "Lelio Fulgenzi" < lelio at uoguelph.ca > 
Cc: "cisco-voip voyp list" < cisco-voip at puck.nether.net > 
Sent: Tuesday, April 24, 2012 6:38:47 PM 
Subject: Re: [cisco-voip] PVDMs, DSP farms, et al.... next steps? 

can i go without it? do i need it for conferencing/xcoding/MTP? 
No, Yes 

when enabling dsp farm'ing, i can see a couple of examples which state "voice-card 0" what is this voice-card 0? is this the motherboard? is this the DSP chip itself? 
PVDM2/3 modules installed in the slot on the motherboard. 

if i install another DSP chip, would I see "voice-card 1" 
If you insert a NM-HDV2 in slot 1, that would be configured as "voice-card 1". Answer is no. 

On Tue, Apr 24, 2012 at 3:16 PM, Lelio Fulgenzi < lelio at uoguelph.ca > wrote: 

ok, that last document didn't help much either. 

so here's a couple of general questions: 

where/when do i need dsp farm'ing? can i go without it? do i need it for conferencing/xcoding/MTP? 

when enabling dsp farm'ing, i can see a couple of examples which state "voice-card 0" what is this voice-card 0? is this the motherboard? is this the DSP chip itself? if i install another DSP chip, would I see "voice-card 1" 

thanks everyone! 

--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (ANNU) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 

From: "Lelio Fulgenzi" < lelio at uoguelph.ca > 
To: "cisco-voip voyp list" < cisco-voip at puck.nether.net > 
Sent: Tuesday, April 24, 2012 4:55:29 PM 
Subject: Re: PVDMs, DSP farms, et al.... next steps? 

well, i read the first two docs i mentioned, and, i'm not too further along. looks like there's one more i should look at: 

http://www.cisco.com/en/US/customer/docs/routers/access/1900/software/configuration/guide/pvdm3_config_ps10538_TSD_Products_Configuration_Guide_Chapter.html 

hopefully this one will help. 

--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (ANNU) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 

From: "Lelio Fulgenzi" < lelio at uoguelph.ca > 
To: "cisco-voip voyp list" < cisco-voip at puck.nether.net > 
Sent: Tuesday, April 24, 2012 1:26:55 PM 
Subject: PVDMs, DSP farms, et al.... next steps? 

Hi all, 

I'm in the process of migrating from 6608s to 3945s. I've got all the pieces and I'm just wondering about next steps. 

I've found the following documents: 

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/7x/media.pdf 

http://www.cisco.com/en/US/docs/ios-xml/ios/voice/cminterop/configuration/15-1mt/vc-enh-confr-vgr.pdf 

But I'm wondering if there are any others people can recommend. 

Also, if there are any hints or recommendations on going forward, that too would help. 

I'll have two 3945s, each with a PVDM-256 installed that I need to use for 8 T1s into each router, and for conferencing mainly. But I'll also want to try and do some transcoding if possible. 

Thanks, Lelio 

--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (ANNU) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 

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-- 
duy 
CCIE #27737 Voice 

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