Nortel 2001 Installation And Operation Manual page 289

See Table 34 for more information about the Advanced Audio screen.
Table 34
Advanced Audio screen
Selection
NetEQ (Global IP Sound)
Jitter Buffer
Highwater Mark
Early Packet and Late Packet
Resync
Echo cancellation
MVC 2050 can use the Voice Gateway Media Card for echo cancellation.
Nortel Mobile Voice Client 2050
Description
NetEQ packet loss concealment
software is the default mode of
operation.
A Jitter Buffer is used to minimize a
change in rate for arriving voice
frames. The Jitter Buffer sends voice
frames to your 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.
Highwater Mark indicates the
maximum number of voice frames the
application should have in its jitter
buffer before it starts discarding
packets. This value should be at least
2.5 times the value of jitter. If a smaller
value is assigned, MVC 2050 regards it
as an error and corrects it.
Early Packet Resync and Late Packet
Resync indicate the points at which
MVC 2050 discards and restarts the
jitter buffer contents. This value should
be at least five times
.
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the
Highwater