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Collaboration, Voice & AV · Intermediate

Packet Voice Digital Signal Processor Module (PVDM)

A Cisco router module that supplies DSP resources for TDM voice, transcoding, conferencing and media termination.

Definition

PVDM modules (for example PVDM4 on ISR G3 and ISR 4000 routers) plug into the motherboard and provide DSP capacity measured in channels. Their DSPs are allocated to voice ports through the voice-card configuration and to SCCP-registered media resources through dspfarm profiles. Insufficient PVDM capacity causes calls to fail when transcoding or conference resources are needed.

Example

dspfarm profile 1 conference with codec g711ulaw uses PVDM DSPs to host a conference bridge for CUCM.

Exam tip

If a question asks what hardware enables an ISR router to act as a transcoder or conference bridge, the answer is PVDM DSPs.

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