CISCO
PVDM4-256 Cisco 256-Channel High-Density Voice DSP Module, or Spare
Mfg Part Number: PVDM4-256 , Item #: 1721194
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Price: $9,649.65
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Last Updated: Jan 19, 2026
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The PVDM4 modules are supported on the Cisco 4451-X platform. You can plug them directly into the single slot on the router motherboard or onto the network interface module (NIM) that supports T1/E1 ports. Enhanced DSP architecture accommodates a new packet-processing engine optimized for rich-media voice applications, while concurrently supporting the time-division multiplexing IP (TDM-IP) voice framework.
A PVDM4 module plugged onto the motherboard delivers IP-based voice services such as conferencing, media optimization, and transcoding. A PVDM4 module plugged onto the NIM daughter card would be used for voice T1/E1 connectivity.
All the PVDM4 modules have the same form factor and are field-upgradable to allow you to easily scale your voice deployments.
Main Specification
| General Information | |
| Manufacturer | Cisco Systems, Inc |
| Manufacturer Part Number | PVDM4-256 |
| Manufacturer Website Address | http://www.cisco.com |
| Brand Name | Cisco |
| Product Name | 256-Channel High-Density Voice DSP Module, or Spare |
| Product Type | PVDM |
| Technical Information | |
| Application/Usage | Voice |
| Physical Characteristics | |
| Height | 0.7" |
| Width | 2.5" |
| Depth | 2.6" |
| Weight (Approximate) | 0.08 lb |
| Miscellaneous | |
| Compatibility | Cisco 4400 Series Integrated Services Routers |
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