VC-55™ PR Voice Codec Board
(Preliminary)
User's Manual
Encode_Mode
Slip_Mode
EncodeCmode
Chan_Rx_Min_Time
Chan_Rx_Max_Time
Encode_Source
Channel_Uart_Rate
Sync_Err_Rate
Lost_Sync_Rate
Lost_Packets
Dropped_Packets
DecodeErrRate
Table 5 vc55param output to screen
Executing the vc55param program without setting any of the parameter options will result in a print to
screen of all the current settings information stored in the VC-55™ -PR Vocoder Board 's flash memory.
VC-55™ -PR Vocoder Board Status
The VC-55™-PR Vocoder Board LED Status is designed to conveniently display the current conditions
for Audio I/O, vocoder and communications channel to the operator.
The top two LEDS of the VC-55™-PR Vocoder Board indicate the current running condition. The LCD
indicators indicate the status of the board
LED ID
PWR
LED 1
LED 2
LED 3
LED 4
DVSI Confidential Proprietary
board.
APCO (Full Rate)
1 (Slip Mode On)
0(NS & DTX off); 64(NS on); 2048 (DTX on); 2112 (NS & DTX on)
0 -636 (The jitter buffer delay as set in the parameters)
4 - 640 (The jitter buffer delay as set in the parameters)
1 (Handset)
20 – 240 (115,200 to 9,600 as set in the parameters)
Sync error rate is the bit error rate in the sync and rate words of the
packet multiplied by 512
The number of times the channel has lost sync
The number of packets not received from across the channel. This
could be due problems in the channel or for clock drift between the
two systems.
The number of packets that got dropped and not processed by the
decoder because it could not keep up with the input.
estimated bit error rate in FEC protected bits of packet *2^17
Location
Description (when LED ON)
D2
Power Applied
D12
Lost Packet
D11
Encoder is running.
D10
Decoder is running.
D1
Channel is Syncronized
Section 3 – Set-up & Control
Half-Rate (Half-Rate)
0 (Slip Mode Off)
2 (Line –In)
Page 13
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