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New Member

DSP Allocations

I have a 3845.

When I do a "show inventory" i see:

Admin-3845#show inventory

NAME: "3845 chassis", DESCR: "3845 chassis"

PID: CISCO3845         , VID: V01 , SN: FTX12

NAME: "c3845 Motherboard with Gigabit Ethernet on Slot 0", DESCR: "c3845 Motherboard with Gigabit Ethernet"

PID: CISCO3845-MB      , VID: V07 , SN: FOC12

NAME: "PVDMII DSP SIMM with four DSPs on Slot 0 SubSlot 4", DESCR: "PVDMII DSP SIMM with four DSPs"

PID: PVDM2-64          , VID: V01 , SN: FOC12

NAME: "PVDMII DSP SIMM with four DSPs on Slot 0 SubSlot 5", DESCR: "PVDMII DSP SIMM with four DSPs"

PID: PVDM2-64          , VID: V01 , SN: FOC12

NAME: "High Density Voice2 Network module with on board two port interface  on Slot 1", DESCR: "High Density Voice2 Network module with on board two port interface "

PID: NM-HDV2-2T1/E1    , VID: V05 , SN: FOC12

NAME: "PVDMII DSP SIMM with four DSPs on Slot 1 SubSlot 2", DESCR: "PVDMII DSP SIMM with four DSPs"

PID: PVDM2-64          , VID: V01 , SN: FOC12

NAME: "PVDMII DSP SIMM with four DSPs on Slot 1 SubSlot 3", DESCR: "PVDMII DSP SIMM with four DSPs"

PID: PVDM2-64          , VID: V01 , SN: FOC12

NAME: "High Density Voice2 Network module with on board two port interface  on Slot 2", DESCR: "High Density Voice2 Network module with on board two port interface "

PID: NM-HDV2-2T1/E1    , VID: V05 , SN: FOC12

NAME: "PVDMII DSP SIMM with four DSPs on Slot 2 SubSlot 2", DESCR: "PVDMII DSP SIMM with four DSPs"

PID: PVDM2-64          , VID: V01 , SN: FOC12

NAME: "PVDMII DSP SIMM with four DSPs on Slot 2 SubSlot 3", DESCR: "PVDMII DSP SIMM with four DSPs"

PID: PVDM2-64          , VID: V01 , SN: FOC12

Admin-3845#

From this information I can see i have 6 x PVDM2-64 modules. 2 on each NM-HDV2-2T1/E1 and 2 on the motherboard. Correct?
Here is my running config:
!
isdn switch-type primary-ni
!
voice-card 0
dsp services dspfarm
!
voice-card 1
!
voice-card 2
!
!
controller T1 1/0
pri-group timeslots 1-24 service mgcp
description ***ATT
!
controller T1 1/1
!
controller T1 2/0
clock source internal
pri-group timeslots 1-24 service mgcp
description ***ATT
!
controller T1 2/1
!
dspfarm profile 10 conference
codec g711ulaw
codec g711alaw
codec g729ar8
codec g729abr8
codec g729r8
codec g729br8
maximum sessions 16
associate application SCCP
Why am I only allowed to have a max sessions of 16 on profile 10? Why can't I add another profile doing transcoding? It gives me <0-0> when I type "maximum sessions ?".
Thanks for any help,
JJ

  • IP Telephony
1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: DSP Allocations

Enable dspfarm under voice-card 1 and 2 and try again..

voice-card 1
dsp service dspfarm
voice-card 2

  dsp services dspfarm

5 REPLIES
Cisco Employee

Re: DSP Allocations

Enable dspfarm under voice-card 1 and 2 and try again..

voice-card 1
dsp service dspfarm
voice-card 2

  dsp services dspfarm

New Member

Re: DSP Allocations

Thanks that was it!

So before, I assume it was only using 2 x PVDM2-64.

This means I had 128 channels configured for use. I had two pri's terminated in the router. So this means 48 channels were allocated to the PRIs. This leaves 80 channels. So, I was only able to configure up to 16 conferences. Does that mean each conference takes 5 channels?

Thanks,

JJ

Cisco Employee

Re: DSP Allocations

Conferences are a little more complicated than that...

Unlike voice termination or xcoding which can coexist

on a DSP, conferecing requires  a dedicated DSP.

It depends on codecs u have under conf profile as well

as max party in one conf session.

You shd get a fair idea by going through following doc:

http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/interop/intcnf2.html

Also, it will save u lot of time/effort/pain if u use following tool

for scoping out your dsp needs:

DSP Calculator:

www.cisco.com/cgi-bin/Support/DSP/dsp-calc.pl

It even gives u the CLI u need to configure...

I hope this helps...

DK

New Member

Re: DSP Allocations

Thanks Dilip.

So what if I didn't want conferencing and just terminate those two PRIs. How do I calculate how many DSPs I need? Would I fill out the calc with the two NM and put 24 lines for each one under G.711?

Forgive me, I'm trying to understand.

Thanks

Cisco Employee

Re: DSP Allocations

Correct...you'd use output from show diag to select the correct platform

and then populate each HWIC slot or NM slot according to hardware module

installed.

Then depending on how may voice termination you are going to use (2 T1s in

your case) put proper number (24  for each NM slot in your case) under the

codec you are going to use.

Diff. codecs takes different amount of dsp resources so selecting correct codec

is important in figuring out proper number of dsps.

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