Comtech EF Data SNM-1001L - Manual (Page 227)

14–1
Chapter 14. DECODER
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.
Figure 14-1. Sequential Decoder Block Diagram
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