Comtech EF Data SDM-9000 - Manual (Page 187)

Rev. 4 A–1
A
Appendix A.
OPTIONS
This appendix describes the Reed-Solomon Codec, Direct Broadcast Satellite (DBS), and
Digital Video Broadcast (DVB) options.
A.1 Reed-Solomon Codec
The Reed-Solomon Codec PCB (AS/4080) is a 6.75” x 7.50” daughter card that is
located on the interface PCB. The interface card fits in the middle slot of the modem
chassis.
The Reed-Solomon Codec works in conjunction with the Viterbi decoder, and includes
additional framing, interleaving, and Codec processing to provide concatenated FEC and
convolutional encoding and decoding (per IESS-308).
Refer to Figure A-1 for the Reed-Solomon Codec block diagram.
8 BIT
I
N
T
E
R
F
A
C
E
MODULATOR
3 CHANNEL
SERIAL DATA
REED-SOLOMON
MUX DATA
OVERHEAD
DEMUX DATA
8 BIT
PROCESSOR
3 CHANNEL
DEMODULATOR SERIAL DATA
Figure A-1. Reed-Solomon Codec Block Diagram