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Net-2000™ VCU Users Manual

Version 4.0, December, 2013

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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