Next Working Day
On qualifying orders
UK Dispatched
Fast & reliable nationwide
Expert Support
Mon–Fri, 8 am – 6 pm
Genuine Brands
Authorised reseller
Next-working-day delivery. Order before 17:30 (England & Wales) or 16:00 (Northern Ireland, Republic of Ireland, Scotland) to receive next-working-day delivery. Orders placed before 17:30 Friday are delivered Monday; after 17:30 Friday arrive Tuesday. Upgrades — pre-9, pre-10:30, pre-noon, special and secure bulk — available at extra cost.
Orders over £100 (ex VAT) receive FREE next-working-day delivery across the UK.
Instant digital delivery. Software licences, subscriptions, warranties & insurance, and electronic copies are delivered the same day via email — provided a valid email address is entered at checkout.
*UK business days (Mon–Fri). Orders placed after Friday 17:30 will be dispatched Monday for Tuesday delivery. Subject to stock, payment clearance and courier network conditions.

Cisco Fourth-Generation 32-Channel High-Density Packet Voice Digital Signal Processor Module - voice DSP module
Voice DSP module
for Cisco 4451-X
Weight: 0.14 KG
- Voice-quality management
- Energy-saving
Overview
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.
Main Specifications
- Product Description
- Cisco Fourth-Generation 32-Channel High-Density Packet Voice Digital Signal Processor Module - voice DSP module
- Device Type
- Voice DSP module
- Form Factor
- Plug-in module
- Bus Voltage
- 3.3 V
- Dimensions (WxDxH)
- 5.08 cm x 6.65 cm x 1.7 cm
- Weight
- 36 g
- RAM
- 512 MB
- Compliant Standards
- G.711, G.729a, G.729ab, G.726, G.722, G.728, G.729, G.729b
- 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
Associated Documents
Product Features
Voice-quality management
The PVDM4 modules perform compression, voice-activity-detection, jitter-management, and echo-cancellation functions.
Energy-saving
The PVDM4 DSPs offer multiple power-saving modes, including a power-saver mode when the module is not in use. In power-saver mode each PVDM4 can save up to 5 watts of power.
Specifications
General
- Bus Voltage
- 3.3 V
- Form Factor
- Plug-in module
- Device Type
- Voice DSP module
Networking
- Connectivity Technology
- Wired
- Compliant Standards
- G.711, G.729a, G.729ab, G.726, G.722, G.728, G.729, G.729b
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, EN 60950-1 Second Edition, NOM-019-SCFI-1998, EFTA, CAN/CSA-C22.2 No. 60950-1
Power
- Power Consumption Operational
- 4.85 watt
Environmental Parameters
- Min Operating Temperature
- 0 °C
- Max Operating Temperature
- 50 °C
Memory
- RAM
- 512 MB
Weight & dimensions
- Weight
- 36 g
- Height
- 1.7 cm
- Width
- 5.08 cm
- Depth
- 6.65 cm
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

