Options
SDM-9000 Satellite Modem
A–2
Rev. 4
A.1.1 Specifications
Reed-Solomon Codec word
n = 208
k = 192
t = 8
Interleaver
Modified block interleaving, depth = 4
Unique word insertion
Per IESS-308 specification
Note:
The Reed-Solomon implementation conforms to the INTELSAT IESS-308
specification.
A.1.2 Theory of Operation
The Reed-Solomon Codec card works in conjunction with the Viterbi decoder to provide
concatenated convolutional encoding and decoding. The Reed-Solomon Codec block
diagram is shown in Figure A-1. The two main sections of the Codec that will be
discussed in this section are the Reed-Solomon encoder (Section A.1.2.1) and the Reed-
Solomon decoder (Section A.1.2.2).
A.1.2.1 Reed-Solomon Encoder
A block diagram of the Reed-Solomon encoder section is shown in Figure A-2. The
Reed-Solomon encoder section includes the following circuits:
•
8-bit parallel scrambler
•
Input FIFO
•
Reed-Solomon Codec
•
Output First In/First Out (FIFO)
•
Interleaver
•
8-bit parallel to 3-bit serial channel reformatter
JP2
TXSATDAT
JP2
JP2
MUXDAT
(SERIAL)
MUXCLK
U5
INPUT
FIFO
U6
RS CODEC
(ENCODER
SECTION)
U6
UNIQUE WORD
INSERTION
U5
RAM
INTERLEAVER
U4
8 BIT PARALLEL
TO 3 CHANNEL
SERIAL
REFORMATTER
JP2
TXSATCLK
U5
INTERLEAVER
ADDRESS
GENERATOR
U5
RS TIMING
U5
CONTROLLER
SYNCHRONOUS
SCRAMBLER
PARALLEL
Figure A-2. Reed-Solomon Encoder Section Block Diagram
Summary of Contents for SDM-9000
Page 2: ......
Page 5: ...8 Mbit s w IDR Figure 1 7 16QAM BER Performance Curves with Reed Solomon Filename T_ERRATA 3...
Page 8: ......
Page 27: ...SDM 9000 Satellite Modem Introduction Rev 4 1 5 Figure 1 3 SDM 9000 Block Diagram...
Page 42: ...Introduction SDM 9000 Satellite Modem 1 20 Rev 4 This page is intentionally left blank...
Page 64: ...Configuration SDM 9000 Satellite Modem 3 6 Rev 4 JP1 Figure 3 4 Interface PCB AS 3971...
Page 65: ...SDM 9000 Satellite Modem Configuration Rev 4 3 7 Figure 3 5 Interface PCB AS 4477...
Page 66: ...Configuration SDM 9000 Satellite Modem 3 8 Rev 4 JP1 JP6 JP7 Figure 3 6 Interface PCB AS 5618...
Page 70: ...Configuration SDM 9000 Satellite Modem 3 12 Rev 4 Figure 3 7 Nyquist Filter Installation...
Page 83: ...SDM 9000 Satellite Modem Operation Rev 4 4 9 This page is intentionally left blank...
Page 87: ...SDM 9000 Satellite Modem Operation Rev 4 4 13 This page is intentionally left blank...
Page 104: ...SDM 9000 Satellite Modem Operation Rev 4 4 31 This page is intentionally left blank...
Page 107: ...Operation SDM 9000 Satellite Modem 4 34 Rev 4 This page is intentionally left blank...
Page 124: ...SDM 9000 Satellite Modem Operation Rev 4 4 51 Figure 4 17 RF Loopback Figure 4 18 IF Loopback...
Page 150: ...Theory of Operation SDM 9000 Satellite Modem 5 22 Rev 4 Figure 5 6 Interface Block Diagram...
Page 158: ...Theory of Operation SDM 9000 Satellite Modem 5 30 Rev 4 This page is intentionally left blank...
Page 186: ...Maintenance SDM 9000 Satellite Modem 6 28 Rev 4 This page is intentionally left blank...
Page 218: ...Options SDM 9000 Satellite Modem A 32 Rev 4 This page is intentionally left blank...
Page 242: ...Remote Control Operation SDM 9000 Satellite Modem B 24 Rev 4 ref SE_ command...
Page 254: ...Glossary SDM 9000 Satellite Modem g 6 Rev 4 This page is intentionally left blank...
Page 256: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...