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PVDM2 DSP (5510) Processing of Voice Sessions

I'm looking to better understand the algorithms if not actually find a reference doc regarding the dynamics of voice session allocations on PVDM2 (5510) DSP's for IOS 12.4 as seen via "show voice dsp group all". This does not seep to be documented anywhere in CCO.

Here's an example of what I'm talking about (due to size supporting config/show will be in next post):

- Assume a remote site 2821 with two PVDM2-64's and a single PRI, 16 transcoders and 10 conferences.

- voice-card in the default flex mode codec complexity

- IOS allocates 16 signaling channels per 5510 DSP (16 on DSP 1 and 7 on DSP 2).

- Each 5510 DSP has 240 "credits" for work.

- Each g711 call requires 15 credits

- Each call that is or has downspeed to g729a requires 30 credits.

- Each 5510 DSP that has "shared credits" available is eligible to support voice sessions.

- The IOS tends to assigns calls to DSP's that already have signaling channels allocated but will somewhat arbitrarily start using a different DSP that has available shared credits regardless of whether it has signaling channels assigned or not.

- Voice sessions have been allocated ton DSP 2 and DSP 5 while there are still plenty of credits available on DSP 1.

Any insight would be appreciated.

Jon

1 REPLY
New Member

Re: PVDM2 DSP (5510) Processing of Voice Sessions

#sh run (excerpt)

.

.

voice-card 0

dspfarm

dsp services dspfarm

no local-bypass

.

.

controller T1 0/0/0

framing esf

linecode b8zs

pri-group timeslots 1-24 service mgcp

.

.

dspfarm profile 2 transcode

codec g711ulaw

codec g711alaw

codec g729ar8

codec g729abr8

maximum sessions 16

associate application SCCP

!

dspfarm profile 1 conference

codec g711ulaw

codec g711alaw

codec g729ar8

codec g729abr8

maximum sessions 10

associate application SCCP

.

.

#show voice dsp group all

dsp 1:

State: UP, firmware: 4.4.20

Max signal/voice channel: 16/16

Max credits: 240

Group: FLEX_GROUP_VOICE, complexity: FLEX

Shared credits: 180, reserved credits: 0

Signaling channels allocated: 16

Voice channels allocated: 3

Credits used: 60

Voice channels:

Ch02: voice port: 0/0/0:23.23, codec: g711ulaw, credits allocated: 30

Ch03: voice port: 0/0/0:23.20, codec: g711ulaw, credits allocated: 15

Ch04: voice port: 0/0/0:23.19, codec: g711ulaw, credits allocated: 15

Group: FLEX_GROUP_XCODE, complexity: MEDIUM

Shared credits: 0, reserved credits: 0

Transcoding channels allocated: 0

Credits used: 0

dsp 2:

State: UP, firmware: 4.4.20

Max signal/voice channel: 16/16

Max credits: 240

Group: FLEX_GROUP_VOICE, complexity: FLEX

Shared credits: 45, reserved credits: 0

Signaling channels allocated: 11

Voice channels allocated: 2

Credits used: 45

Voice channels:

Ch01: voice port: 0/0/0:23.22, codec: g711ulaw, credits allocated: 30

Ch02: voice port: 0/0/0:23.18, codec: g711ulaw, credits allocated: 15

Group: FLEX_GROUP_XCODE, complexity: MEDIUM

Shared credits: 0, reserved credits: 150

Transcoding channels allocated: 0

Credits used: 0

dsp 3:

State: UP, firmware: 4.4.20

Max signal/voice channel: 16/16

Max credits: 240

Group: FLEX_GROUP_XCODE, complexity: MEDIUM

Shared credits: 0, reserved credits: 240

Transcoding channels allocated: 0

Credits used: 0

dsp 4:

State: UP, firmware: 4.4.20

Max signal/voice channel: 16/16

Max credits: 240

Group: FLEX_GROUP_VOICE, complexity: FLEX

Shared credits: 90, reserved credits: 0

Signaling channels allocated: 0

Voice channels allocated: 0

Credits used: 0

Group: FLEX_GROUP_XCODE, complexity: MEDIUM

Shared credits: 0, reserved credits: 150

Transcoding channels allocated: 0

Credits used: 0

dsp 5:

State: UP, firmware: 4.4.20

Max signal/voice channel: 16/16

Max credits: 240

Group: FLEX_GROUP_VOICE, complexity: FLEX

Shared credits: 210, reserved credits: 0

Signaling channels allocated: 0

Voice channels allocated: 1

Credits used: 30

Voice channels:

Ch01: voice port: 0/0/0:23.1, codec: g711ulaw, credits allocated: 30

dsp 6:

State: UP, firmware: 1.0.6

Max signal/voice channel: 16/16

Max credits: 240

Group: FLEX_GROUP_CONF, complexity: CONFERENCE

Shared credits: 0, reserved credits: 240

Conference session: 2

Credits used: 0

dsp 7:

State: UP, firmware: 1.0.6

Max signal/voice channel: 16/16

Max credits: 240

Group: FLEX_GROUP_CONF, complexity: CONFERENCE

Shared credits: 0, reserved credits: 240

Conference session: 2

Credits used: 0

dsp 8:

State: UP, firmware: 1.0.6

Max signal/voice channel: 16/16

Max credits: 240

Group: FLEX_GROUP_CONF, complexity: CONFERENCE

Shared credits: 0, reserved credits: 240

Conference session: 2

Credits used: 0

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