PVDM4-64 – 64-Channel Voice DSP – Motherboard or T1/E1 NIM Slot

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PVDM4-64 Description

The PVDM4-64 is a Cisco PVDM4 voice DSP module for Cisco 4000 Series Integrated Services Routers that run IP voice, conferencing and transcoding. The module provides 64 DSP channels, of which 64 are low-complexity, 48 medium-complexity and 32 high-complexity, and draws 4.85W at 3.3V. Every Cisco 4000 Series router except the ISR 4461 takes PVDM4 modules, and TDM voice services require the module to sit on a T1/E1 NIM.

Quick Specs

Parameter

Specification

Product ID

PVDM4-64

Product type

PVDM4 voice DSP module

Cisco ordering description

64-channel high-density voice DSP module

Slot type

On-board motherboard or T1/E1 module slot

Supported platform family

Cisco 4000 Series ISRs except ISR 4461 for motherboard PVDM4 support

Low-complexity channels

64

Medium-complexity channels

48

High-complexity channels

32

TDM voice service path

Supported when installed on a T1/E1 NIM

Motherboard service path

IP media services such as conferencing and transcoding

Minimum software listing

IOS XE 3.10 / XE SD-WAN 17.3 / vManage 20.3

Module power

4.85W

Application Scenarios

T1/E1 Voice Gateway Branch

A branch router that terminates T1/E1 voice trunks carries the module on its T1/E1 voice and WAN NIM, which gives the NIM 64 DSP channels for TDM-to-IP voice calls.

Conferencing And Transcoding

An ISR 4000 router in a regional office can run conferencing and codec transcoding from the PVDM4 slot on its motherboard, so media services stay on the router that handles the calls.

Product Comparison

Parameter

PVDM4-64

PVDM4-32

PVDM4-128

NIM-PVDM-64

Slot type

On-board motherboard or T1/E1 module slot

On-board motherboard or T1/E1 module slot

On-board motherboard or T1/E1 module slot

Network Interface Module slot

Supported platforms

Cisco 4000 Series ISRs except ISR 4461

Cisco 4000 Series ISRs except ISR 4461

Cisco 4000 Series ISRs except ISR 4461

Catalyst 8300 and ISR 4461

DSP channels

64

32

128

64

Low-complexity channels

64

32

128

Not published

Medium-complexity channels

48

24

96

Not published

TDM applications

Supported on a T1/E1 NIM

Supported on a T1/E1 NIM

Supported on a T1/E1 NIM

Not supported

PVDM4-64 is the 64-channel PVDM4 voice DSP module, sitting between PVDM4-32 at 32 channels and PVDM4-128 at 128 channels in the same motherboard or T1/E1 NIM slot family. A codec plan that needs more than 64 channels moves up to PVDM4-128, and a smaller plan can drop to PVDM4-32. Routers that take their DSP in a Network Interface Module slot, namely the Catalyst 8300 and the ISR 4461, which has no motherboard PVDM4 slot, use NIM-PVDM-64 instead, a 64-channel module that carries IP voice only and cannot serve TDM. TDM voice therefore stays with PVDM4-64 installed on a T1/E1 NIM.

Ordering Checklist

  • Motherboard PVDM4 slot: Order for Cisco 4000 Series ISR models with a motherboard PVDM4 slot, which is every 4000 Series ISR except the ISR 4461. The ISR 4461 has no such slot, so the module cannot be placed there.
  • T1/E1 NIM: Pair with NIM-xMFT-T1/E1 voice and WAN NIMs in 1, 2, 4 or 8 ports, which carry the PVDM4 on the module. Voice on these NIMs needs it for channels and echo cancellation.

Specifications

Parameter Specification Parameter Specification
Product ID PVDM4-64 Product type PVDM4 voice DSP module
Cisco ordering description 64-channel high-density voice DSP module Slot type On-board motherboard or T1/E1 module slot
Supported platform family Cisco 4000 Series ISRs except ISR 4461 for motherboard PVDM4 support Low-complexity channels 64
Medium-complexity channels 48 High-complexity channels 32
TDM voice service path Supported when installed on a T1/E1 NIM Motherboard service path IP media services such as conferencing and transcoding
Minimum software listing IOS XE 3.10 / XE SD-WAN 17.3 / vManage 20.3 Voice application licensing Minimum Unified Communications Technology Package noted for voice applications
DSP technology Multicore DSP technology Interface Integrated Services Card slot on motherboard or T1/E1 NIM
Operating temperature 0°C to 50°C (32°F to 122°F) Voltage 3.3V
Input current 1.47A Power 4.85W
Weight 0.08 lb (36 g) Dimensions 0.67 x 2.50 x 2.62 in. (1.7 x 5.1 x 6.7 cm)

Quality Certifications

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    Barbara Perry
    Posted on 29/04/2026
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    Hands-off operation since installation. Reliable performance. Shipping took a couple extra days, but product itself is perfect.

    Steven Miller
    Posted on 09/02/2026
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    5.0

    Loyalty programs aren’t needed when the service is this good. We just keep coming back.

    Sven Parker
    Posted on 21/12/2025
    Verified Buyer
    5.0

    Build quality is what you’d expect at full retail price.

Questions & Answers

  • Which Cisco routers accept PVDM4-64?

    PVDM4-64 fits every Cisco 4000 Series ISR except the ISR 4461, which has no motherboard PVDM4 slot. The module sits in the motherboard slot or on a T1/E1 NIM, and trunk voice services require the NIM position.
  • What minimum software does PVDM4-64 need?

    PVDM4-64 is listed from IOS XE 3.10, XE SD-WAN 17.3 and vManage 20.3. Voice applications on the module list the Unified Communications Technology Package as the minimum software license for those applications.
  • What input current does PVDM4-64 draw at 3.3V?

    PVDM4-64 draws 1.47A at 3.3V, which gives the 4.85W module power. The load is small, so adding the module to the motherboard slot or to a T1/E1 NIM does not call for a separate power plan in the router.
  • What temperature range can PVDM4-64 operate in?

    PVDM4-64 operates from 0 to 50 degrees C (32 to 122 degrees F). Keep the router air inside that range to stay within the module specification, particularly in unventilated branch cabinets where the DSP pool carries conferencing and transcoding all day.
  • What are the size and weight of PVDM4-64?

    PVDM4-64 weighs 0.08 lb (36 g) and measures 0.67 x 2.50 x 2.62 in. (1.7 x 5.1 x 6.7 cm). The small card plugs into the Integrated Services Card slot on the motherboard or onto a T1/E1 NIM.
  • Can PVDM4-64 in the motherboard slot carry TDM trunk calls?

    No. T1/E1 trunk voice with PVDM4-64 requires the module to sit on a T1/E1 NIM. In the motherboard slot it supplies IP media services such as conferencing and transcoding. Install it on the NIM when T1/E1 trunks need DSP channels.

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DataSheet Downloads

  • PVDM4-64 Datasheet