Comtech EF Data C5 - Manual (Page 277)

C5/K1/K3 Integrated Satellite Terminal System Options
Rev. 0 A–33
A.3.1.2 Theory of Operation
The Reed-Solomon Codec works in conjunction with the interface card to provide
concatenated convolutional encoding and decoding.
The two main sections of the Codec are:
! Reed-Solomon encoder (Section A.3.1.3)
! Reed-Solomon decoder (Section A.3.1.4)
A.3.1.3 Reed-Solomon Encoder
A block diagram of the Reed-Solomon encoder section is shown in Figure A-10.
The Reed-Solomon encoder section includes the following circuits:
! Parallel/Serial Converter
! RAM Interleaver
! Reed-Solomon Codec (encoder section)
! Serial/Parallel Converter
! Synchronous Scrambler
U4 U3 U4 U1 U4
JP2
JP2
TXSAT DAT
TXSAT CLK
U4
U4
MUXDATA
(SERIAL)
MUXCLK
SERIAL
TO PARALLEL
CONVERTER
RS CODEC
(ENCODER SECTION)
UNIQUE WORD
INSERTION
RAM
INTERLEAVER
INTERLEAVER
ADDRESS
GENERATOR
RS TIMING CONTROLLER
PARALLEL
TO SERIAL
CONVERTER
SYNCHRONOUS
SCRAMBLER
JP2
JP2
Figure A-10. Reed-Solomon Encoder Section Block Diagram