Specifications

Net-2000™ VCU Users Manual
Version 4.0, December, 2013
VO
IP Mode
4.6.2 GMR-2 Vocoder Selection
Figure 18 GMR-2 Vocoder Selection
4.7 BGAN Vocoder Selection
The VCU contains an implementation of Inmarsat’s BGAN 4 kbps vocoder. Vocoder Type selection is done from
the VOIP Mode Vocoder window. The only BGAN vocoder data rate option user has the ability to run is 4000 bps
with no FEC. This is the default and only selection in the drop down menu.
Figure 19 BGAN Vocoder Selection
4.8 GMR-2+ Vocoder Selection
To run the GMR-2+ vocoder , select it from the Vocoder Type drop down. The user has the ability to run GMR-2+
vocoder with or without FEC using the Data Rate drop down menu. The default rate for the GMR-2+ vocoder is
6000 bps (2450 bps speech source with 3550 bps FEC). Other rates available for the GMR-2+ vocoder are as
follows: 2450 bps speech with 0 bps FEC; Bit Steal one bit - 2450 bps speech source with 3550 bps FEC; Bit Steal
one bit - 2450 bps speech with 0 bps FEC.
Figure 20 GMR-2+ Vocoder Selection
(Subject to Change) Page 21
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