Posted by: Mudassir Ali | June 2, 2011

All About PVDM DSP

All About PVDM DSP

Q. What is a PVDM? What function does it provide on the Cisco Integrated Service Routers?

A. A Packet Voice Digital Signal (PVDM) is a hardware module that provides digital-signal-processor (DSP) resources to the system. A PVDM module can be populated with one or more DSPs.

The DSP resources on a PVDM module provide collaboration services including voice sessions, transcoding sessions, conference sessions, and video.

DSP Chip

The DSP chip plays a crucial role in the Cisco Unified Communications system. The DSP chip comes in several form factors, from soldered on to the main board of the Cisco Unified IP phone or gateway, to the modular packet voice DSP module (PVDM). The PVDM can have multiple DSPs on the module.

The type of DSP chip, the number of DSP resources, and the type of codec that is used all factor into the calculation of how many simultaneous calls can be processed.

DSP Modules

Currently, there are two major types of high-density PVDMs: PVDM generation 2 (PVDM2) and PVDM generation 3 (PVDM3). The Cisco 2800 and 3800 Series platforms support only the PVDM2 modules. The Cisco 2900 and 3900 Series platforms support both the PVDM2 and PVDM3 modules. The PVDM3 modules provide higher density (up to four times higher) than the PVDM2s. They also provide improved performance in terms of the number of conference and transcoding sessions supported.

 

 

DSP Module Comparison

PVDM2 vs PVDM3

 

Cisco DSP Calculator

The total number of PVDMs (Packet Voice/fax Digital Signal Processor (DSP) Modules) required on a Cisco 2800, 3800, 2900 or 3900 series Integrated Services Router (ISR) for a particular voice configuration is calculated by the DSP calculator tool.

Resources

· High-Density Packet Voice Digital Signal Processor Module for Cisco Unified Communications Solutions

FAQ

High-Density Packet Voice Digital Signal Processor Modules

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Responses

  1. Keep up the good work!!, Well organized

    Thanks

    Unni

  2. […] […]

    • Below commands will show you installed PVDM and status.
      !
      show inventory
      !
      show voice dsp
      !

      Router# show inventory
      NAME: “3845 chassis”, DESCR: “3845 chassis”
      PID: CISCO3845 , VID: V05 , SN: FTX1440A0U5

      NAME: “c3845 Motherboard with Gigabit Ethernet on Slot 0”, DESCR: “c3845 Motherboard with Gigabit Ethernet”
      PID: CISCO3845-MB , VID: V09 , SN: FOC14372RQR

      NAME: “VWIC2-2MFT-T1/E1 – 2-Port RJ-48 Multiflex Trunk – T1/E1 on Slot 0 SubSlot 0”, DESCR: “VWIC2-2MFT-T1/E1 – 2-Port RJ-48 Multiflex Trunk – T1/E1”
      PID: VWIC2-2MFT-T1/E1 , VID: V01 , SN: FOC14427JWW

      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: FOC14353CBE

      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: FOC143605X8

      Router# show voice dsp

      —————————-FLEX VOICE CARD 1 ——————————
      *DSP VOICE CHANNELS*
      DSP DSP DSPWARE CURR BOOT PAK TX/RX
      TYPE NUM CH CODEC VERSION STATE STATE RST AI VOICEPORT TS ABRT PACK COUNT
      ===== === == ======== ======= ===== ======= === == ========= == ==== ============
      C5510 001 01 modem-re 4.5.909 busy idle 0 0 1/1/0 05 0 298/353

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