Specifications

Net-2000™ VCU Users Manual
Version 4.0, December, 2013
VO
IP Mode
4.2 Vocoder Selection (Version Dependant)
The Net-2000™ VCU is available in a variety of vocoder configurations. Depending on the version purchased the
unit may contain one or two of the following vocoders. All versions of the Net-2000™ VCU include A-law and U-
Law.
Vocoders
AMBE®
AMBE+™
AMBE+2™
APCO Standard
APCO Enhanced
GMR-1 Vocoder
GMR-2 Vocoder
BGAN Vocoder
GMR-2+ Vocoder
A-Law
U-Law
Figure 13 Vocoder Type and Rate Selection
4.2.1 Forward Error Correction (FEC)
FEC is built into the following version of the Net-2000™ VCU.
Vocoder
AMBE®
AMBE+™
AMBE+2™
APCO Standard
APCO Enhanced
GMR-1 Vocoder
GMR-2+ Vocoder
The vocoder can be selected with or without FEC to allow for various testing conditions. This is a feature that is
ideal for mobile communication applications that experience degraded channel conditions and/or significant bit
errors.
4.3 APCO Vocoder Version – APCO Standard and APCO Enhanced
The Vocoder Type selection window allows the operator to select between the APCO Standard and APCO
Enhanced Vocoders. Only one vocoder can be selected at a time. After switching from one vocoder to the other it
is necessary to select the start button in order to initiate the change.
(Subject to Change) Page 17
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