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Net-2000™ VCU Users Manual

Version 4.0, December, 2013

Interface Protocol

Total Rate

(bps)

Speech

Rate

(bps)

FEC Rate

(bps)

rate_[0] rate_[1] rate_[2] rate_[3] rate_ [4] rate_ [5] Index

3600 4000 0 0x0050 0x0000 0x0000 0x0000 0x0000 0xc450 0

6000 2450 3550 0x0031 0x0000 0x0000 0x0000 0x0000 0xca78 0

2450 2450 0 0x0031 0x0000 0x0000 0x0000 0x0000 0xca31 1

6000 2450 3550 0x0031 0x0000 0x0000 0x0000 0x0000 0xca78 2

2450 2450 0 0x0031 0x0000 0x0000 0x0000 0x0000 0xca31 6

Table 20 BGAN and GMR-2+ Rate Table

Table Key

AMBE® Vocoder

AMBE+™ Vocoder

AMBE+2™ Vocoder

APCO Standard Vocoder

APCO Enhanced Vocoder

GMR-1 Vocoder

GMR-2 Vocoder

BGAN Vocoder

GMR-2+ Vocoder

Table 21 Rate Tables Key

6.3.2.8 Channel Data Packet Bytes 18 and 19 (cmode)

The cmode element of a Channel Data Packet contains the input command flags to the decoder when it is received

by a VCU or the output status flags of the encoder when it is transmitted by a VCU. Table 22 and Table 23 list

values

for the decoder input and encoder output flags of a Channel Data Packet.

cmode parameter

16 bit Word

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Decoder Input Flags

Byte 18 Byte 19

Hex Value

Nominal Value 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0x0000

AMBE_LOST_FRAME_FLAG 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0x0004

AMBE_CNI_FRAME_FLAG 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0x0008

AMBE_DTMF_SEND_FLAG 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0x4000

Table 22 cmode Parameter (Used in the Decoder Command Packet)

The nominal value for the cmode parameter should be zero when sending Channel Data Packets to the VCU. The

decoder will perform a frame repeat when the AMBE_LOST_FRAME_FLAG is set. The decoder will generate

comfort noise (i.e., mute) when the AMBE_CNI_FRAME_FLAG is set. The decoder will ignore the channel data

in the packet and generate a tone when the AMBE_DTMF_SEND_FLAG is set. The index and amplitude of the

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