[cisco-voip] DSP Allocation

[Ryan Ratliff]

So my previous email was not very clear.  Of course an analog port  
will require DSPs to convert the analog signal to digital.  However I  
was thinking of the old days where an analog port required an NM-2V  
which had the DSPs to be used for the analog ports.  In this case the  
PVDM DSPs went into the NM-HDV module and were thus used with the E1/ 
T1 ports or for dspfarm resources.

The DSP Calculator Wes linked shows that for a 2811 with (2) VIC2-FXO  
modules in slot 0 and slot 1 doing 4 g.711 calls it requires 1  
PVDM2-8.  Since this is probably the smallest PVDM we have I can't  
say how many of them will actually be used. or how it allocates them  
when you have more than one PVDM present.

Either way you'll have plenty of extra DSPs on that box.

-Ryan

On Feb 21, 2008, at 10:12 AM, Ryan Ratliff wrote:

AFAIK your router will not use any DSPs for analog ports.  Only  
digital ports (E1, T1) and dspfarm media resources use DSPs.

-Ryan

On Feb 21, 2008, at 10:08 AM, STEVEN CASPER wrote:

  Lets say I have a 2811 with 8 FXO connections. In the router I have  
a PVDM2-8 and a PVDM2-16. The router assigns DSP resources for voice  
terminations when the router loads. Does anyone know how does the  
router decides which PVDM to use?

Thanks!
Steve

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