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Datum Systems PSM-500L Bedienungsanleitung Seite 29

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Datum Systems PSM-500, 500H & 500L VSAT/SCPC Modem Specification
Rev. 0.86
A-29
TPC FEC Full Encoder:
Rate ½.......................................... 1094 user rate bits.
Rate ¾.......................................... 573 channel rate bits.
Rate 7/8........................................ 482 channel rate bits.
TPC FEC Short Encoder:
Rate ¾.......................................... 208 channel rate bits.
Rate 7/8........................................ 164 channel rate bits.
IBS Multiplexer: ................................12 user rate bits.
Demodulator Receive Delays
Demodulation Processing ................1 user rate bits.
Viterbi FEC Decoder
Rate ½.......................................... 184 channel rate bits.
Rate ¾.......................................... 186 to 188 channel rate bits.
Rate 7/8........................................ 186 to 190 channel rate bits.
TPC FEC Full Decoder:
Rate ½.......................................... 2025 user rate bits + fixed 751 uS delay.
Rate ¾.......................................... 2196 channel rate bits + fixed 446 uS delay.
Rate 7/8........................................ 3593 channel rate bits + fixed 447 uS delay.
TPC FEC Short Decoder:
Rate ¾.......................................... 729 channel rate bits + fixed 218 uS delay.
Rate 7/8........................................ 1087 channel rate bits + fixed 290 uS delay.
FIFO Buffer (enabled) ...................... 3 user rate bits plus bit setting.
Reed-Solomon Decoder depth = 4: 32·k+(24·k·(4·D-n))/n+11 User/IBS Demux
..........................................................Input Rate Bits + Fixed 500us Delay
.......................................................... where D is the smallest integer >=(n-1)/4
depth = 8: ..64·k+(24·k·(4·D-n))/n+11 User/IBS Demux Input
.......................................................... Rate Bits + Fixed 500us Delay
.......................................................... where D is the smallest integer >=(n-1)/8
IBS Multiplexer ................................. 4 user rate bits.
Bit Rate definition:
"User" bit rate = "Terrestrial" interface rate.
“Channel” bit rate is the Convolotional Encoder Input Data Rate for the Modulator.
“Channel” bit rate is the Viterbi Decoder Output Data Rate for the Demodulator.
"Channel" bit rate = User bit rate X (1/Mux rate) (if mux enabled) X (1/RS rate) (if RS enabled).
Delay Examples:
Reed-Solomon Example 1, if n=126, k=112 and Depth=4 then
Total R-S Encoder Delay=906 User/IBS Mux Output Bits + Fixed 500us Delay
D=32, Total R-S Decoder Delay=3,638 User/IBS Demux Input Bits + Fixed 500us Delay
Reed-Solomon Example 2, if n=201, k=219 and Depth=4 then
Total R-S Encoder Delay=1,618 User/IBS Mux Output Bits + Fixed 500us Delay
D=55, The Total R-S Decoder Delay=6,465 User/IBS Demux Bits + Fixed 500us Delay
Reed-Solomon Example 3, if n=205, k=225 and Depth=4 then
Total R-S Encoder Delay=1,650 User/IBS Mux Output Bits + Fixed 500us Delay
D=56, The Total R-S Decoder Delay=6,549 User/IBS Demux Bits + Fixed 500us Delay
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