Description
The Cisco PVDM4-256 is a high-density Packet Voice Digital Signal Processor (DSP) module designed to deliver advanced voice and media services for Cisco Integrated Services Routers. Supporting up to 256 voice channels, this module enables high-performance voice packetization, conferencing, transcoding, and media optimization in unified communications environments.
Built on Cisco’s PVDM4 architecture, the PVDM4-256 provides scalable DSP resources for enterprise and service provider deployments requiring reliable digital voice connectivity over IP networks. It supports a wide range of industry-standard voice codecs and integrates seamlessly into compatible Cisco ISR platforms via the motherboard or supported T1/E1 modules.
Ideal for organizations expanding voice infrastructure, the PVDM4-256 delivers efficient processing, low power consumption, and enterprise-grade reliability for mission-critical communications.
| Specification | Details |
|---|---|
| Brand | Cisco |
| SKU | PVDM4-256= |
| Product Type | Packet Voice Digital Signal Processor (DSP) Module |
| Series | PVDM4 |
| Maximum Voice Channels | 256 |
| Codec Support | G.711, G.722, G.726, G.728, G.729, G.729a/b/ab, iLBC, Fax Relay, Modem Relay |
| DSP Architecture | Multicore DSP |
| Supported Functions | Voice packetization, conferencing, transcoding, transrating, echo cancellation |
| Form Factor | On-board motherboard DSP module |
| Slot Compatibility | Cisco ISR motherboard or supported T1/E1 modules |
| Operating Temperature | 0°C to 50°C (32°F to 122°F) |
| Power Consumption | Low-power DSP module |
| Deployment | Enterprise and service provider voice networks |
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Return Policy (Short Summary)
We offer a 30-day return window for most unopened, factory-sealed items.
Returns must be authorized before shipping back and must include all original packaging and accessories. Opened or used items are not returnable unless defective.
Some products—such as custom orders, special-order items, audio gear, software, and LED video walls—are non-returnable. Non-defective returns may be subject to a 20–30% restocking fee, and customers are responsible for return shipping costs.
For damaged or incorrect items, please contact us immediately.
From Scope to Sign-Off
A structured delivery process designed to reduce risk and keep projects moving.
Plan
Discovery, site review, requirements gathering, and project alignment. We define scope, constraints, and success criteria before any design work begins.
- Discovery calls & stakeholder interviews
- On-site survey & infrastructure review
- Requirements & use-case documentation
- Project scope, timeline & milestone alignment
Engineer
System design, schematics, signal flow, BOM development, and documentation. Every project leaves this phase with a complete engineering package.
- AV system design & signal flow diagrams
- Equipment selection & BOM development
- Rack layout & control system design
- As-built documentation package
Deploy
Procurement, logistics, installation, programming, commissioning, and training. We own the delivery from first shipment to final handoff.
- Authorized procurement & logistics coordination
- Physical installation & cable management
- Control system programming & configuration
- Commissioning, testing & end-user training
Support
Monitoring, maintenance, lifecycle planning, and long-term service agreements. We stay engaged long after project close.
- 24/7 remote system monitoring
- Preventive & reactive maintenance
- Technology lifecycle & refresh planning
- Long-term service level agreements
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