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 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.
Specifications
General 
Device Type: Voice DSP module

Form Factor: Plug-in module

Bus Voltage: 3.3 V
Networking 
Connectivity Technology: Wired

Compliant Standards: G.711, G.729a, G.729ab, G.726, G.722, G.728, G.729, G.729b
Processor / Memory 
RAM: 512 MB
Miscellaneous 
Compliant Standards: CISPR 22 Class B, CISPR 24, EN 61000-3-2, IEC 60950, EN 61000-3-3, EN55024, EN50082-1, EN55022 Class B, AS/NZS 60950-1, EN 61000-4-4, EN 61000-4-2, EN 61000-4-3, EN 61000-4-6, EN 61000-4-5, EN 61000-4-11, EN 61000-4-8, UL 60950-1, EN 60950-1, UL 60950-1 Second Edition, FCC CFR47 Part 15 B, GB 4943, CAN/CSA C22.2 No. 60950-1, EN 60950-1 Second Editi
Power 
Power Consumption Operational: 4.85 Watt
Dimensions & Weight 
Width: 2 in

Depth: 2.6 in

Height: 0.7 in

Weight: 1.27 oz
Environmental Parameters 
Min Operating Temperature: 32 °F

Max Operating Temperature: 122 °F
Compatibility Information 
Designed For: Cisco 4451-X, 4451-X Application Experience, 4451-X Integrated Services Router Security Bundle, 4451-X Integrated Services Router Voice and Video Bundle, 4451-X Integrated Services Router Voice Security Bundle