• Cisco PVDM4-256 DSP module with green circuit board and black heat sink
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Cisco

Cisco PVDM4-256 | DSP module | PVDM4 | 256 G.711 ch | high-density transcoding/conferencing | ISR 4000 compatible

PVDM4-256

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Description

Top-tier PVDM4 digital signal processor module providing up to 256 G.711-equivalent channels for large-scale voice transcoding, conferencing, and TDM/VoIP interworking on ISR 4000 platforms. Ideal for high-density UC, contact center trunks, and CUBE edge deployments.

Features

- Highest-density PVDM4 option with up to 256 G.711 channels
- Robust hardware transcoding and conferencing for large sites
- Supports key enterprise codecs and T.38 fax relay
- Designed for ISR 4000 voice services and PSTN gateway roles
- Enhances call quality and reduces CPU load via hardware media handling
- SRTP-capable when configured at the platform level

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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FAQs

Technical Specifications

FAQs

Q: What deployments benefit from the 256-channel capacity?
A: High-density SIP trunking, large conferencing requirements, and CUBE edge deployments where substantial transcoding is needed.

Q: Is it backward compatible with older ISR platforms?
A: It is intended for ISR 4000 Series. Check platform documentation for specific PVDM4 socket support.

Q: Does it come with any feature licenses?
A: No. DSP hardware is license-free; platform features (e.g., CUBE, CME) may require separate licenses.

Q: Can it be installed on a voice NIM?
A: Yes, on supported voice NIMs that accept PVDM4 modules, or on the router motherboard PVDM4 socket.

Q: How does codec choice affect capacity?
A: Complex codecs and features like transcoding/conferencing reduce the maximum number of simultaneous channels.

Technical Specifications

- Series: PVDM4 DSP module
- Channel capacity (G.711 equivalent): up to 256
- Primary functions: transcoding, conferencing, MTP, tone/DTMF, T.38 fax relay
- Codec support: G.711, G.729a/b, G.722, iLBC (capacity varies by codec/feature mix)
- Use cases: large UC sites, SIP trunking gateways, CUBE border elements
- Platform compatibility: ISR 4000 Series (e.g., 4221–4461) and supported voice NIMs
- Installation: fits PVDM4 socket on motherboard or supported voice NIMs
- Security: supports SRTP when enabled on the host platform (IOS XE)
- Hot-swap: not hot-swappable; power down before install/remove
- Licensing: no per-module license; platform feature licenses may apply

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