Command Reference Guide

306 ● vad-on 3Com Router 5000 Family and Router 6000 Family
Command Reference
vad-on
Purpose Use the vad-on command to enable silence detection function.
Use the undo vad-on command to disable silence detection function.
Syntax vad-on
undo vad-on
Parameters None
Default By default, the silence detection function is disabled.
Example Enable the VAD function of POTS voice entity 10.
[Router-voice-dial-entity10] vad-on
View This command can be used in the following views:
■ Voice Entity view
Description VAD is an abbreviation of Voice Activity Detection, generally termed as silence
detection. Its basic idea is to detect and delete any silence on the basis of the
difference of energy between the voice signals of people’s conversation and their
silence signals, so that no signals are produced; and only when an abrupt activity tone
is detected will a voice signal be generated and transmitted. It is displayed by research
that no less than 50% transmission bandwidth can be attained by the use of VAD
technology.
Related Command entity