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A.2.1.2
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:
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•
A.2.1.3
Reed-Solomon Encoder
A block diagram of the Reed-Solomon encoder section is shown in Figure A-16.
The Reed-Solomon encoder section includes the following circuits:
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•
•
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•
JP2
M U X D ATA
(S E R IAL)
S YN C H R O N O U S
S C R AM B LE R
JP2
M U X C LK
Figure A-16. Reed-Solomon Encoder Section Block Diagram
A–62
Reed-Solomon encoder (Section A.2.1.3)
Reed-Solomon decoder (Section A.2.1.4)
Synchronous Scrambler
Reed-Solomon Codec (encoder section)
Serial/Parallel Converter
RAM Interleaver
Parallel/Serial Converter
S ER IA L
R S C O D E C
TO PA R ALLE L
(E N C O D ER S E C T IO N )
C O N VE R TER
U 4
R S T IM IN G C O N T R O LL E R
U N IQ U E W O R D
R A M
IN S ER TIO N
IN TE R LE AV E R
U 3
U 4
IN TE R LE AV E R
A D D R E SS
G E N E R ATO R
U 4
SDM-300A Satellite Modem
J P 2
PA R AL LE L
T X S AT D AT
TO S E R IAL
C O N VE R TER
T X S AT C L K
U 1
U 4
J P 2
U 4
Rev. 4
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