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PVDM4-256
256-channel DSP module
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PVDM4-256 is a high-performance voice processing module engineered to deliver efficient, scalable voice service integration with enterprise-grade communication platforms. Designed as a DSP card with a modular PCI Express form factor, this module facilitates robust call processing while supporting integration with routers, IP gateways, and unified communications systems.
PVDM4-256 offers reliable compatibility with a range of commercial communication infrastructures and supports voice protocols including SIP and TCP/IP. With its optimized design for 256-channel voice processing and DSP acceleration, this module is ideal for expanding telephony capabilities in modern data centers and network edge devices.
PVDM4-256 price is $298.00, a 97.7% saving from the Cisco list price of $12,860.00. PVDM4-256 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for PVDM4-256 for additional pricing. Browse the full Pvdm Voice/Fax Modules series or explore all Cisco products.
In a global call-center deployment, integrating the PVDM4-256-256-channel DSP module into Cisco ISR routers enables processing of 1,000+ simultaneous SIP trunks on a single chassis. This consolidation reduces hardware footprint by 40%, lowers OPEX through streamlined maintenance, and delivers carrier-grade voice quality (MOS ≥4.1) to improve customer satisfaction and operational efficiency.
A Tier-1 service provider leverages the PVDM4-256-256-channel DSP to perform real-time codec transcoding (G.711, G.729, G.722) and multi-party conferencing at network edge POPs. The module scales up to 256 simultaneous streams, ensuring seamless interoperability across legacy and IP-only networks, boosting service uptime to 99.999% and increasing ARPU by enabling premium conferencing add-ons.
A federal agency deploys the PVDM4-256-256-channel DSP module for FIPS-compliant AES-256 voice encryption across remote field offices. Supporting 256 encrypted channels with sub-5 ms latency, it ensures mission-critical communications remain secure without sacrificing call clarity, fully meeting DoD security mandates and enhancing operational readiness.
To get the detailed certification, please go to the Compliance Center.
| PVDM4-256 |  PVDM2-24DM |  PVDM2-8 |  PVDM3-32 |  PVDM2-64 | |
|---|---|---|---|---|---|
| Product Type | Voice Processing Module | Digital Media Module | Network Module / Network Card | Digital Signal Processing Module | Network Card |
| Module Type | DSP Card | Digital Media Module | WAN | DSP | Ethernet |
| Data Rate | N/A | N/A | 1Gbps | 1Gbps | 10Gbps |
| Connector Type | PCI Express | PCIe | RJ-45 | PCIe | SFP+ |
| Supported Protocols | SIP / TCP/IP | TCP/IP | TCP/IP | TCP/IP, VoIP | TCP/IP |
| Form Factor | Modular | PCIe | PCIe | PCIe | PCIe |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Input Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Compatibility | Enterprise Routers & Communication Systems | N/A | Cisco / Juniper / Arista / Dell / HP | Cisco, Juniper, Arista, Dell, HP | Cisco, Dell, HP |
| Max Speed | N/A | N/A | 1Gbps | 1Gbps | 10Gbps |
| Supported Features | 256-channel voice processing, DSP acceleration | N/A | Auto-negotiation / Jumbo Frames / QoS | Multi-channel processing, Auto-negotiation, QoS | Auto-negotiation, Jumbo Frames, QoS |
| Power Consumption | N/A | N/A | 10W | 15W | 15W |
| Interface Ports | N/A | N/A | Ethernet | PCIe | SFP+ |
| Expansion Slots | N/A | N/A | N/A | N/A | N/A |
| Product Name | PVDM4-256 Voice Processing Module | PVDM2-24DM Digital Media Module | PVDM2-8 WAN Module | PVDM3-32 | PVDM2-64 High-Speed Network Module |
| Height | N/A | N/A | 1.5 inches | 0.8 inches | 1.2 inches |
| Width | N/A | N/A | 3.5 inches | 3.5 inches | 3.4 inches |
| Depth | N/A | N/A | 0.5 inches | 7.5 inches | 6.7 inches |
| Weight | N/A | N/A | 0.4 lbs | 1.2 lbs | 0.75 lbs |
The 256-channel DSP module is perfect for handling high-density traffic. It ensures high-quality voice and video processing with excellent performance.
The PVDM4-256 module has exceeded expectations. It processes voice and video flawlessly, making our network more efficient and scalable.
This high-density DSP module handles massive volumes of voice and video traffic with ease. The performance has been outstanding across all our systems.
The PVDM4-256 is an essential part of our system. It provides excellent processing power for voice and video, ensuring smooth communication.
With the PVDM4-256, our voice and video quality has dramatically improved. It's a high-performance module that integrates seamlessly into our network.
The PVDM4-256 is a high-density digital signal processing (DSP) module designed to deliver up to 256 voice or data channels on supported Cisco ISR and ASR routers.
The module supports up to 256 simultaneous voice or data channels, enabling large-scale transcoding, conferencing and packet telephony applications.
The PVDM4-256 is compatible with Cisco ISR 4000, 4400 and ASR 1000 series routers that feature a PVDM4 expansion slot.
It provides industry-leading DSP services such as G.711/G.729 transcoding, conferencing, transcoding, media termination and packet voice streaming.
Power off your router, insert the PVDM4-256 into an available PVDM4 slot, secure it with the captive screws, then power the router back on.
The module draws approximately 19 Watts under full load and operates at standard router power rails (12 VDC).
The PVDM4-256 measures 7.4 x 4.2 x 0.8 inches (188 x 106 x 20 mm) and weighs approximately 0.3 pounds (136 grams).
It operates reliably between 0 °C and 40 °C (32 °F to 104 °F) in standard operating environments.
Common applications include large-scale IP telephony, media gateway functions, secure voice conferencing and multi-format transcoding.
With 256 channels, it reduces deployment costs by consolidating DSP resources, lowers latency, and increases voice quality and reliability.
Use your router’s CLI to download and install the latest PVDM4 image via TFTP or USB, then reload the router to activate the update.
Cisco offers a one-year limited hardware warranty and optional SMARTnet support plans for software updates, 24/7 access to TAC and advance replacement.
In the router CLI, enter the command ‘show platform hardware qfp active feature voice dsp’ to display installed DSP modules and channel counts.
Authorized Cisco resellers, partners and the Cisco online store carry the PVDM4-256. Contact your local Cisco representative for pricing and availability.
Lead times vary by region and reseller inventory but typically range from 1 to 3 weeks after order confirmation.
For configuration help and troubleshooting, contact Cisco TAC via phone or the online support portal, referencing your product serial number.