Chapter 14. Decoder; Decoder; Sequential Decoder; Figure 14-1. Sequential Decoder Block Diagram - Comtech EF Data SNM-1001L Installation And Operation Manual

14.1

Decoder

14.1.1

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 14-1 for a block diagram of the sequential decoder.
MICRO-
COMPUTER
BUS
I CHANNEL
Q CHANNEL

Chapter 14. DECODER

MICROCOMPUTER
INTERFACE
SYNDROME INPUT
GENERATOR
AMBIGUITY
RESOLVER
INPUT
BUFFER
COST AS
PROCESSOR
VCXO
SWEEP
CLOCK
RECOVERY

Figure 14-1. Sequential Decoder Block Diagram

SYNDROME SHIFT
REGISTER A
PARITY OUTPUT
GENERATOR BUFFER
SYNDROME SHIFT
REGISTER B
ADDRESS LOCK
GENERATOR DETECT
TIMING AND
PROCESS
CONTROL
CLOCK
14–1
V .35
RECEIVE
DESCRAMBLER
DAT A
DIFFERENTIAL
DECODER
CHANNEL BER
DETECTOR
RECEIVE
CLOCK
RCVR
DDS
IF
AGC
CONTROL