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Cisco Fourth-Generation Packet Voice Digital Signal Processor Module for Cisco Unified Communications Solutions Data Sheet

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Product Overview

The Cisco ® Fourth-Generation Packet Voice Digital Signal Processor Module (PVDM4) enables Cisco 4451-X Integrated Services Routers (ISRs) to provide rich-media capabilities such as high-density voice connectivity, conferencing, transcoding, media optimization, transrating, and secure voice in Cisco Unified Communications Solutions.
The fourth-generation packet voice digital-signal-processor (DSP) modules are available in four densities: PVDM4-32, PVDM4-64, PVDM4-128, and PVDM4-256, with 32, 64, 128, and 256 channels, respectively (Figure 1). Tables 1 and 2 show the number of voice channels and codecs that each PVDM4 module supports.

Figure 1. PVDM4 Top View

Features and Benefits

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.

Codec Support and Capacity

The PVDM4 modules support a wide range of codecs of different complexities. They support all codecs that are supported by the PVDM3 modules. Table 1 lists the codecs supported on the PVDM4 modules, and Table 2 gives the channel densities of the PVDM4 modules. Table 3 lists the media-enhancement features.

Table 1. Voice, Fax, and Modem Codec Support on PVDM4 Modules

Low-Complexity Codecs

Medium-Complexity Codecs

High-Complexity Codecs

G.711,

Clear-channel, and

Fax and Modem Pass-through

G.729a,

G.729ab,

G.726,

G.722, and

Fax Relay

G.728,

G.729,

G.729b,

Internet Low Bitrate Codec (iLBC), and

Modem Relay

AMR WB

Table 2. Channel Densities of PVDM4 Modules

Name

Description

Number of Channels

Low- Complexity

Medium- Complexity

High-Complexity

PVDM4-32

32-channel voice DSP module

32

24

16

PVDM4-64

64-channel voice DSP module

64

48

32

PVDM4-128

128-channel voice DSP module

128

96

64

PVDM4-256

256-channel voice DSP module

256

192

128

Table 3. Media Enhancement Features

Feature

Echo cancellation

Tone detection

Noise reduction

Acoustic shock prevention

Conferencing, Transcoding, and Transrating Services

The PVDM4 modules support digital voice connections, conferencing, and universal transcoding services. The PVDM4-256 can support up to 8conferences with 64 participants in each conference and up to 88 conferences with 8 participants in each conference. Please refer to the PVDM4 Q&A for more information about the number of supported sessions.
In conjunction with Cisco IOS ® Software, the PVDM4 modules support universal transcoding and the same codec repacketization as the PVDM3 modules. Universal transcoding allows transcoding from any supported codec to any other supported codec. Refer to the PVDM4 Q&A for more details about the number of supported sessions for each codec.
The PVDM4 modules support transrating, where repacketization of the same codec is used to connect dissimilar networks that have different codec packetization periods.

Voice-Quality Management

The PVDM4 modules perform compression, voice-activity-detection, jitter-management, and echo-cancellation functions. The echo cancellation offered in the PVDM4 modules has a tail length of 128 milliseconds (ms) and complies with ITU-T G.168.

Energy-Saving Feature

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.

Cisco Platform Availability

The PVDM4 modules are supported on Cisco 4451-X platforms. The platform has one slot for the PVDM4 module. You can plug any additional PVDM4 modules onto the T1/E1 NIMs.
Note that PVDM3 modules are not supported on the Cisco 4451-X, and PVDM4 modules are not supported on the Cisco 2900 and 3900 Series platforms.

Product Specifications

Table 4 gives module specifications.

Table 4. Module Specifications

Feature

Specifications

Components

DSP

Multicore DSP technology

DSP external memory

512-megabit double-data-rate (DDR) synchronous dynamic random access memory (SDRAM) for each DSP

Interface

240-pin dual-inline-memory-module (DIMM) interface

Features

Echo cancellation

Software echo cancellation compliant with ITU-T G.168, with 128-ms tail coverage

Operating temperature

32 to 122°F (0 to 50°C)

Voltage

3.3V

Current

1.47A

Power

4.85W

Weight

0.08 lb (36g)

Dimensions (H x W x D)

0.67 x 2.50 x 2.62 in. (1.70 x 5.08 x 6.65 cm)

Regulatory and Compliance

Safety

• Complies with IEC 60950 (worldwide) and AS/NZS 60950-1 (Australia and New Zealand) CAN/CSA-C22.2 No. 60950-1, 1 st and 2 nd Ed. (Canada) and GB4943-95 (People's Republic of China)
• EN60950-1, 1 st and 2 nd Ed. (CENELEC; includes EU and EFTA)
• NOM-019-SCFI-1998 (Mexico), and UL 60950-1, 1 st and 2 nd Ed. (United States)

Homologation

Platform dependent

Mean time between failure (MTBF)

System dependent

EMC

Emissions

• CISPR22, Class B
• EN55022, Class B, CFR47, Part 15, Subpart B, Class B

Harmonics

EN61000-3-2

Flicker

EN61000-3-3

Immunity

• CISPR24
• EN 55024
• EN50082-1

Electrostatic discharge (ESD)

EN 61000-4-2

RF fields

EN 61000-4-3

EFT

EN 61000-4-4

Surge

EN 61000-4-5

Conducted RF

EN 61000-4-6

Power-frequency magnetic fields

EN 6100-4-8

Voltage dips, sags, and interruptions

EN 61000-4-11

Ordering Information

Table 5 gives ordering information for the modules.

Table 5. Ordering Information

Description

Part Number

32-channel high-density voice DSP module, or spare

PVDM4-32 or PVDM4-32=

64-channel high-density voice DSP module, or spare

PVDM4-64 or PVDM4-64=

128-channel high-density voice DSP module, or spare

PVDM4-128 or PVDM4-128=

256-channel high-density voice DSP module, or spare

PVDM4-256 or PVDM4-256=

To place an order, visit the Cisco Ordering Home Page and refer to Table 5. To download software, visit the Cisco Software Center.

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