The PVDM4-64 is a Cisco Packet Voice Digital Signal Processor Module (PVDM) that provides rich-media capabilities such as high-density voice connectivity, conferencing, transcoding, media optimization, transrating, and secure voice for Cisco Unified Communications solutions. Here are some of its key features: 1. Universal Transcoding: The PVDM4-64 supports universal transcoding, which allows conversion from any supported codec to any other supported codec. 2. Voice-Quality Management: The module performs compression, voice-activity detection, jitter management, and echo cancellation. The echo cancellation offered in the PVDM4-64 has a tail length of 128 milliseconds and complies with ITU-T G.168. 3. Energy-Saving Feature: The PVDM4-64 offers multiple power-saving modes, including a power-saver mode when the module is not in use. In power-saver mode, each PVDM4-64 can save up to 5 watts of power. 4. T1/E1 Voice: One of the primary uses of PVDMs is to packetize digital voice into IP packets to enable Time-Division Multiplexing (TDM) digital voice applications. 5. Conferencing: PVDM modules support ad hoc and meet-me conferencing with various codecs in conjunction with Cisco Unified Communications Manager and Cisco Unified Communications Manager Express. 6. Transrating: The PVDM4-64 supports transrating, in which the same codec is repacketized in order to connect dissimilar networks that have different codec packetization periods. 7. RAM : The PVDM4-64 comes with 512 MB of RAM. 8. Compatibility : The PVDM4-64 is compatible with Cisco 4451-X Integrated Services Routers (ISRs). 9. Operating Temperature: The PVDM4-64 operates at a temperature range of 32° to 122°F (0° to 50°C). 10. Power: The PVDM4-64 operates at a voltage of 3.3V and a current of 1.47A.
