High-Density Packet Voice Digital Signal Processor Module for Cisco Unified Communications Solutions
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Product Overview
The Cisco
® High-Density Packet Voice Digital Signal Processor (DSP) Module (PVDM2) enables Cisco Integrated Services Routers to provide high-density voice connectivity, conferencing, and transcoding capabilities in Cisco IP Communications solutions. Cisco Integrated Services Routers provide enterprises and service providers with a toll bypass solution by connecting their existing telephony equipment (such as private branch exchanges [PBXs], key systems, analog telephones, and fax machines) to a toll-free data network and eventually migrating customers to Cisco Unified Communication Architecture for Voice, Video and Integrated Data IP telephony solutions.
The high-density packet voice DSP modules are available in five versions: PVDM2-8, PVDM2-16, PVDM2-32, PVDM2-48, and PVDM2-64 (Figure 1). Tables 1 and 2 show the number of voice channels and codecs that each PVDM2 module supports.
Figure 1. PVDM2 Top and Bottom Views
Table 1. Channel Density of Each PVDM2 Module
* The number of channels in PVDM2 product numbers and descriptions is the maximum channel density with the G.711 codec.
Table 2. Codec Support on the PVDM2 Module
| Name |
High-Complexity Codecs |
Medium-Complexity Codecs |
| PVDM2 Module |
G.723.1, G.728, G.729, G.729b, iLBC, and Modem Relay |
G.7112, g.729a, G.729ab, G.726, G.722, and Fax Relay |
* PVDM2 can support a higher density of G.711 calls than that of other medium-complexity codecs. See Table 1.
PVDM2 connects to the host through 80-pin single inline memory module (SIMM) slots. The module is field insertable and removable. Figure 2 shows how PVDM2 is plugged into PVDM2 SIMM slots on the Cisco high-density digital voice network modules.
Figure 2. PVDM2 SIMM Slots on the Cisco High-Density Digital Voice Network Modules
Features and Benefits
Investment Protection and Field-Upgradable Capability
PVDM2 is used across a series of Cisco Integrated Services Routers and high-density voice network modules, allowing users to distribute or reuse DSP resources among the routers or network modules as needed. The field-upgradable capability enables users to easily scale their voice deployments.
In addition, each DSP on the PVDM2 provides four times the processing power and more memory than the existing PVDM. The high performance of PVDM2 supports future growth.
High Density and Flexibility
PVDM2 provides high call density per DSP and flexibility of channel allocation. The maximized support of uncompressed G.711 voice calls optimizes DSP utilization for the solutions, mainly based on G.711 codecs such as IP telephony, in a LAN where the bandwidth consumed by uncompressed calls is not a concern.
Conferencing and Transcoding Services
With PVDM2, Cisco Integrated Services Routers and voice network modules provide both digital and analog voice connections and conferencing and transcoding services. In conjunction with host software, PVDM2 supports universal transcoding when needed. Universal transcoding allows transcoding from any supported codec to any other supported codec. As a general rule, the number of sessions needed for a universal transcoding channel is the sum of the session requirements for two separate voice channels, one running each of the configured codecs. For example, a channel running universal transcoding from a G.729a codec to iLBC would need the session capacity for a voice channel running the G.729a codec and MIPS (million instructions per second) for a voice channel running the iLBC codec.
Improved Voice Quality
PVDM2 performs compression, voice activity detection, jitter management, and echo cancellation functions to improve voice quality. The echo cancellation offered in PVDM2 has a tail length of 64 milliseconds (ms) and complies with International Telecommunication Union (ITU)-T G.168.
Availability of Features
Table 3 summarizes the availability of features.
Table 3. Features Availability
* The conferencing and transcoding feature on the Cisco 2801 will be available in a future Cisco IOS Software release.
** Onboard support for the PVDM2 modules in the 2911, 2921, 2951, 3925, and 3945 platforms will be via the PVDM adapter, PVDM2-ADPTR. Adapters are not required on the Cisco High-Density Digital Voice Network Modules.
Product Specifications
Table 4 presents product specifications.
Table 4. Product Specifications
Ordering Information
Table 5 presents ordering information.
Table 5. Ordering Information
To place an order, go to the Cisco Ordering homepage:
http://www.cisco.com/en/US/ordering/index.shtml.
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