Nortel 2033 Installation And Operation Manual page 276

Page 276 of 600
553-3001-368 Standard 20.00
Nortel Mobile Voice Client 2050
Jitter buffer
Global IP Sound NetEQ, bundled with MVC 2050 software, provides loss
concealment and compensation for up to 30% packet loss.
NetEQ is an advanced jitter buffer and packet loss concealment unit that
delivers improvements in sound quality, while minimizing latency, for IP
telephone systems. It is a one-sided, embedded solution that enables
high-quality voice over networks. NetEQ reduces jitter buffer delay 30-80 ms
and automatically provides a solution to clock drift present in VoIP hardware.
NetEQ is codec independent.
The jitter buffer is used to minimize a change in rate for arriving voice frames.
The jitter buffer sends voice frames to the PDA sound system at a fixed rate.
The rate of arrival of voice frames is variable. The value of "jitter" is the
normal number of voice frames the application should have in its jitter buffer.
Codec
MVC 2050 supports G.711 which provides higher audio quality with no
compression.
Frame Size
MVC 2050 supports G.711-64 A-law and U-law with 10 ms to 960 ms frame
sizes in 10 ms increments. Optimum and recommended payload is
established as 30 ms frame size.
December 2006