5.37.1.2. The Voice Compression Board 
Voice Compression needs a new board called VCM (Voice Compression
Module) which is available in two versions:
|
Name
|
Item number
|
description
|
|
VCM-B15
|
Q2235-X
|
This is the standard VCM with 15 B-channels. It
occupies 4 B-channels of a S0/S2 board.
In case of a S0 board the
4 B-channels (2 S0 trunks) have to be in the same trunk group.
|
|
VCM-B7
|
Q2235-X100
|
This variant of VCM with 7 B-channels occupies
2 B-channels of the S0/S2 board. It should be prevential used if on a
S0/S2 board not more than 2 B-channels can be occupied.
|
- The G.728 Standard is used for compression.
- The VCM supports a transit mode where the voice data will stay compressed.
- The VCM can be used only with the new Atlantik architecture.