Comtech EF Data SNM-1001L - Manual (Page 234)

SNM-1001L Satellite Modem Revision 1
Reed-Solomon Codec MN/SNM1001L.OM
15–2
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. Refer to Figure 15-2 for a block diagram of the
Reed-Solomon Codec.
CHASSIS
INTERFACE
CDRDATA
LOOPBACK
TX DATA
TX CLK
MUXDATA
MUX CLK
INTERFACE
PCB
MUX CDR CLK
DECDATA
OVERHEAD
PROCESSOR
RX
DATA
LOOPBACK
MUX
DMXDATA
DMX CLK
RX CLK
DEC CLK
REED-SOLOMON
MAIN MAIN
PCB
Figure 15-2.Reed-Solomon Codec Block Diagram
15.1.1 Specifications
The following overhead types and data rates are supported by the Reed-Solomon Codec option.
Refer to
Appendix A for BER specifications.
Overhead Type Data Rate
AUPC
2.4 to 2048 kbps
No Overhead 2.4 to 4.555 kbps
15.1.2 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
• Reed-Solomon decoder