Skip to content


by Cisco
Product Line: Cisco Voice and Video Products
Product Type: Digital Signal Processor (DSP)
Original price $0.00 - Original price $192.00
Original price
$0.00 - $192.00
Current price $192.00
Title: Used

Orders typically ship within 1-3 Business days, if you need an item to ship sooner please contact us.

Product Description

The PVDM3-256 is equipped with 256 channels, supporting a maximum of 256 low-complexity, 192 medium-complexity, and 120 high-complexity codecs, catering to a wide array of codec requirements including G.711, G.729a, and iLBC. This module is designed for integration with Cisco 2901 to 3945-E Integrated Service Routers, requiring Cisco IOS Software Release 15.0(1)M and featuring a 240-Pin DIMM interface with 512 MB SDRAM for memory. It operates within a temperature range of -5 °C to 55 °C, consumes 4.85 W power, and supports advanced functions like compression, echo cancellation with a 128 ms tail length, and universal transcoding, powered by multicore DSP technology.

Key Feature for the PVDM3-256

  • What is the maximum number of channels supported?
    The maximum number of channels supported is 256.
  • Which codecs are supported by the device for low-complexity processing?
    For low-complexity codecs, the device supports G.711, Clear-Channel, Fax and Modem Passthrough.
  • How many channels can be processed using medium-complexity codecs?
    Using medium-complexity codecs, up to 192 channels can be processed.
  • Can the device support high-complexity codecs, and if so, which ones?
    Yes, it supports high-complexity codecs including G.728, G.729, G.729b, iLBC, and Modem Relay.
  • What are the Integrated Services Routers compatible with this device?
    Compatible Integrated Services Routers include Cisco 2901, 2911, 2921, 2951, 3925, 3945, 3925-E, and 3945-E.
  • What is the required Cisco IOS Software Release for operation?
    The device requires Cisco IOS Software Release 15.0(1)M for operation.
  • How much external memory is available?
    There is 512 MB SDRAM of external memory available.
  • What are the operating temperature limits of the device?
    The device operates between -5 °C and 55 °C.
  • What power specifications does the device have?
    The device operates at 3.3 V, 1.47 A, consuming 4.85 W of power.
  • Does the device offer any features to manage voice quality?
    Yes, it includes compression, voice activity detection, jitter management, and echo cancellation with a 128 ms tail length.

Product Review

The Cisco PVDM3-256 offers extensive codec support, handling up to 256 channels for low-complexity codecs like G.711 and ensuring versatile voice and video communications across various applications. However, its performance varies with codec complexity, supporting fewer channels for medium (192) and high-complexity (120) codecs, potentially limiting its use in more demanding scenarios. Designed for integration with Cisco Integrated Service Routers and powered by multicore DSP technology, it ensures efficient operation with features like power-saving modes and comprehensive echo cancellation, but its reliance on specific Cisco IOS Software releases and router models may restrict compatibility and flexibility in diverse network environments.


The Cisco PVDM3-256 is a high-density voice and video DSP (Digital Signal Processor) module designed to enhance the capabilities of Cisco Integrated Services Routers (ISR). This module supports a wide range of voice codecs and provides high-quality voice and video services. It is compatible with Cisco 2901, 2911, 2921, 2951, 3925, 3945, 3925-E, and 3945-E Integrated Service Routers and requires Cisco IOS Software Release 15.0(1)M. This DSP module can handle up to 256 channels for low-complexity codecs, 192 channels for medium-complexity codecs, and 120 channels for high-complexity codecs, ensuring flexible deployment options based on the complexity of the codec used. The supported low-complexity codecs include G.711, Clear-Channel, Fax, and Modem Passthrough, making it suitable for basic voice services and data transmission. Medium-complexity codecs such as G.729a, G.729ab, G.726, G.722, and Fax Relay are also supported, offering a balance between bandwidth efficiency and audio quality. For applications requiring the highest audio quality despite limited bandwidth, high-complexity codecs like G.728, G.729, G.729b, iLBC, and Modem Relay can be utilized. The hardware specifications of the Cisco PVDM3-256 are designed to meet the demands of modern network infrastructures. It features 512 MB of external SDRAM and interfaces via a 240-Pin DIMM, providing a reliable and high-speed connection to the router. The module operates within a temperature range of -5 °C to 55 °C and requires a voltage of 3.3 V with a current of 1.47 A, resulting in a power consumption of 4.85 W. These specifications ensure that the module operates efficiently under various environmental conditions. Key features of the Cisco PVDM3-256 include: - Universal transcoding capabilities, allowing for seamless conversion between different codecs. - Power saving modes to reduce energy consumption when the module is idle. - Advanced functions like compression, voice activity detection, jitter management, and echo cancellation with a tail length of 128 ms, enhancing voice quality and reducing latency. The technology behind this module is based on multicore DSP architecture, which enables high performance and scalability for voice and video services. The transcoding support allows for flexible codec conversion, ensuring compatibility and optimal performance across different network conditions. In summary, the Cisco PVDM3-256 DSP module is an essential component for businesses that require high-density voice and video processing capabilities. Its support for a wide range of codecs, coupled with advanced voice and video processing features, make it an ideal solution for enhancing the communication services of Cisco Integrated Services Routers. Whether for basic voice transmission or complex video conferencing, the PVDM3-256 provides the necessary processing power and flexibility to meet diverse network demands.


Item Number Cisco PVDM3-256
Manufacturer Cisco
Total Channels 256
Max Channels for Simple Codecs 256
Max Channels for Intermediate Codecs 192
Max Channels for Complex Codecs 120
Channel Density High
Simple Codecs G.711, Uncompressed, Fax & Modem Bypass
Intermediate Codecs G.729a, G.729ab, G.726, G.722, Fax Transmission
Complex Codecs G.728, G.729, G.729b, iLBC, Modem Transmission
Compatible Routers Cisco 2901, 2911, 2921, 2951, 3925, 3945, 3925-E, 3945-E
Required Software Cisco IOS 15.0(1)M
Memory 512 MB SDRAM
Connection Type 240-Pin DIMM
Operating Temp Min -5 °C
Operating Temp Max 55 °C
Power Voltage 3.3 V
Current Draw 1.47 A
Consumption 4.85 W
Certification Depends on Platform
Life Expectancy Varies by Platform
Codec Conversion Yes
Energy Efficiency Features Yes
Capabilities Data Compression, Silence Suppression, Delay Management, Echo Reduction
Echo Cancellation Duration 128 ms
Codec Adjustment Capability Yes
DSP Type Multi-core DSP

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare