Cisco PVDM4-256 Fourth-Generation 256-Channel High-Density DSP Module

The Cisco PVDM4‑256 provides up to 256 channels of G.711 or 128 channels of G.729 voice processing, enabling rich‑media Unified Communications deployments with exceptional efficiency and scalability. A powerful, fourth‑generation Digital Signal Processor (DSP) module designed to deliver high‑density voice, conferencing, and transcoding services for Cisco’s branch‑routing platforms.

Key Features

• 256‑channel DSP capacity
  Supports high‑density voice, conferencing, transcoding, and media optimization
• Fourth‑generation DSP architecture
  Optimized for rich‑media applications and TDM‑to‑IP voice conversion
• Supports T1/E1 digital voice
  Ideal for PRI, CAS, and channelized voice deployments
• Universal transcoding
  Converts between codecs such as G.711, G.729, iLBC, and more
• Secure voice support
  Enables encrypted voice streams in Cisco Unified Communications environments
• Compact, low‑power design
  Efficient footprint for branch and enterprise deployments

Compatible Cisco Platforms

Cisco 4000 Series ISR (ISR 4K)

Fully supported on all major ISR 4K routers, including:

• ISR 4321
• ISR 4331
• ISR 4351
• ISR 4431
• ISR 4451‑X

Cisco Catalyst 8000 Edge Platforms

The PVDM4 family is also supported on the Catalyst 8000 series for rich‑media voice services.

What’s Included

• Cisco PVDM4‑256 DSP module