Comtech EF Data C5 - Manual (Page 266)

Options C5/K1/K3 Integrated Satellite Terminal System
A–22 Rev. 0
A.2.2 Decoder
A.2.2.1 Sequential Decoder
The sequential decoder is used in closed network applications, typically in Frequency
Division Multiple Access (FDMA) satellite communications systems. The sequential
decoder is a FAST option.
Refer to Figure A-4 for a block diagram of the sequential decoder.
MICRO-
COMPUTER
BUS
MICROCOMPUTER
INTERFACE
SYNDROME SHIFT
REGISTER A DESCRAMBLER
V.35
RECEIVE
DATA
DECODER
DETECTOR
DIFFERENTIAL
CHANNEL BER
OUTPUT
BUFFER PARITY
GENERATOR
SYNDROME SHIFT
REGISTER B
AMBIGUITY
RESOLVER
SYNDROME INPUT
GENERATOR
INPUT
BUFFER
RECEIVE
CLOCK
RCVR DDS
LOCK
DETECT
ADDRESS
GENERATOR
COSTAS
PROCESSOR
I CHANNEL
Q CHANNEL
VCXO
SWEEP
TIMING AND
CONTROL
PROCESS
CLOCK
IF
AGC
CONTROL
CLOCK
RECOVERY
Figure A-4. Sequential Decoder Block Diagram