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.
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.
Universal
transcoding
In conjunction with Cisco
IOS Software, the PVDMs support universal transcoding, which allows
conversion from any supported codec to any other supported codec.
Transrating
The PVDMs support
transrating, in which the same codec is repacketized in order to connect
dissimilar networks that have different codec packetization periods.
Voice-quality
management
The PVDMs perform
compression, voice-activity detection, jitter management, and echo
cancellation. The echo cancellation offered in the PVDMs has a tail
length of 128 milliseconds and complies with ITU-T G.168.
Energy savings
The motherboard PVDMs
(PVDM4s) 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.
