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OM20 Universal Outdoor Modem
Type of
Service
Small IDR
(With 16/15
O/H)
IDR
(With 96
Kbps O/H)
8PSK
DVB
1. n = code length, k = information symbols and t = symbol error correcting capability.
2. Design objective.
4.10 Drop and Insert (D&I)
Refer to Appendix E
MN-OM20– Revision 5
Figure 4-9 Reed-Solomon Decoder Functional Block Diagram
Table 4-1. Reed-Solomon Codes
Data Rate
R-S Code
(Kbps)
(n, k, t)
64
(126, 112, 7)
128
(126, 112, 7)
256
(126, 112, 7)
384
(126, 112, 7)
512
(126, 112, 7)
768
(126, 112, 7)
1024
(126, 112, 7)
1536
(126, 112, 7)
1544
(225, 205,10)
2048
(219, 201, 9)
6312
(194, 178, 8)
8448
(194, 178, 8)
1544
(219, 201, 9)
2048
(219, 201, 9)
6312
(219, 201, 9)
8448
(219, 201, 9)
All
(204, 188, 8)
Bandwidth
Interleaving
1
Expansion
[ (n/k) -1 ]
0.125
0.125
0.125
0.125
0.125
0.125
0.125
0.125
0.0976
0.0896
0.0899
0.0899
0.0896
0.0896
0.0896
0.0896
0.0851
OM20 Theory of Operation
Maximum
Depth
R-S Codec
Delay (ms)
4
115
4
58
4
29
4
19
4
15
4
10
4
8
4
5
4
9
4
7
4
2
4
<2
8
18
8
13
8
4
8
3
12
-
4–17
2
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