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DSP Resources

Answered Question
Mar 14th, 2014
User Badges:

Hello,

I am configuring 4 no's E1 port's  with mgcp service, On 3rd port it prompts me with the below error.It is a new router with PVDM3 64 and no conferencing and transcoding uptil now has been configured to utilize the DSP.

My question is can i configured 120 channels with PVDM3 64 ?? I have used the DSP calculator and it without transcoding/conferencing it is saying no dsp required, i am confuse so can anybody confirm to me how much  DSP will be required.

 

% Not enough DSP resources available to configure pri-group on controller E1 0/1/0
% The remaining dsp resources are enough for 4 time slots.
% For current codec complexity, 2 extra 16 channel dsp(s) are required to create this voice port.
yourname(config-controller)#
Mar 13 13:04:47.176: %XCCTSP_VOICE-3-NOSDB: No signaling data block is available to build the
        voice interface(0/0:15) or DSP may not be present

 

Correct Answer by Aman Soi about 3 years 5 months ago

Hi,

 

[+5] to Jorge for explaination.

 

you can also refer the fantatsic DOC by AOK 

 

https://supportforums.cisco.com/document/123126/cisco-pvdm2-and-pvdm3-ds...

regds,

aman

Correct Answer by Jorge Armijo about 3 years 5 months ago

Hi, 

 

There are many possible scenarios that could explain what is going on, before going further, can you please post the output from:

 

-show diag

-show inventory

-show version

-show voice dsp group all

 

Remember that you can setup the codec complexity under "voice-card", and if you use "Medium or High" the calculation will be different, in addition, is there any other Voice Interface Card installed on the Router?

 

Let's recall few things: 1 PVDM3-64 has 480 Credits per core, since the PVDM has two cores, we have a total of 960 credits. 

http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-ip-service-level-agreements-slas/whitepaper_C11-718333.html

 

One single DSO on a T1-E1 consumes 15 credits if Codec Complexity Flex is being used (Default), now, some math:

E1 = 30 Bchannels 

4 E1 = 120 Bchannels

120 * 15 = 1800 Credits

 

You'll need at least another PVDM3-64 to support the 4 E1 interfaces.

 

I think you may want to verify the DSP Calculator again:

http://www.cisco.com/web/applicat/dsprecal/dsp_calc.html

 

Router: 2951

IOS: 15.1(4)M

 

DSP Modules Required:

 

PVDM3-128: 1

 

DSP Module Allocation:

Router Slot 0:

120 Voice (94%) 8 Available (6%)

 

PVDM Slot 0/0: PVDM3-128

 
    

 

Call Volume Allocation:

 

Router Slot 0

Low

Med

High

 
 

Slot 0/0: VWIC3-4MFT-T1/E1(E1)

120

   
      

 

BTW, I created the Calculator Session with Low Complexity, you have to make sure no g729 calls will go through the Router, otherwise, additional resources will be needed.

HTH

~jorge

 

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Correct Answer
Jorge Armijo Fri, 03/14/2014 - 17:16
User Badges:
  • Silver, 250 points or more

Hi, 

 

There are many possible scenarios that could explain what is going on, before going further, can you please post the output from:

 

-show diag

-show inventory

-show version

-show voice dsp group all

 

Remember that you can setup the codec complexity under "voice-card", and if you use "Medium or High" the calculation will be different, in addition, is there any other Voice Interface Card installed on the Router?

 

Let's recall few things: 1 PVDM3-64 has 480 Credits per core, since the PVDM has two cores, we have a total of 960 credits. 

http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-ip-service-level-agreements-slas/whitepaper_C11-718333.html

 

One single DSO on a T1-E1 consumes 15 credits if Codec Complexity Flex is being used (Default), now, some math:

E1 = 30 Bchannels 

4 E1 = 120 Bchannels

120 * 15 = 1800 Credits

 

You'll need at least another PVDM3-64 to support the 4 E1 interfaces.

 

I think you may want to verify the DSP Calculator again:

http://www.cisco.com/web/applicat/dsprecal/dsp_calc.html

 

Router: 2951

IOS: 15.1(4)M

 

DSP Modules Required:

 

PVDM3-128: 1

 

DSP Module Allocation:

Router Slot 0:

120 Voice (94%) 8 Available (6%)

 

PVDM Slot 0/0: PVDM3-128

 
    

 

Call Volume Allocation:

 

Router Slot 0

Low

Med

High

 
 

Slot 0/0: VWIC3-4MFT-T1/E1(E1)

120

   
      

 

BTW, I created the Calculator Session with Low Complexity, you have to make sure no g729 calls will go through the Router, otherwise, additional resources will be needed.

HTH

~jorge

 

lambay2000 Sat, 03/15/2014 - 13:45
User Badges:

Thanks Aman and george

 

Ur links helped me a lot.
 

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