Dmd2050E Automatic Uplink Power Control (Aupc Operation); Asynchronous Overhead Operation (Async Port / Es-Es Communications); Table 3-4. Reed-Solomon Codes - Comtech EF Data DMD-2050E Installation And Operation Manual

DMD2050E Universal Satellite Modem
Type of Data Rate
Service (Kbps)
Small IDR 64
(With 16/15 128
O/H) 256
384
512
768
1024
1536
IDR 1544
(With 96 Kbps 2048
O/H) 6312
8448
8PSK 1544
2048
6312
8448
DVB All
1. n = code length, k = information symbols and t = symbol error correcting capability.
2. Design objective.
3.14

DMD2050E Automatic Uplink Power Control (AUPC Operation)

Refer to Appendix G for additional information.
3.15 Asynchronous Overhead Operation (Async Port / ES-ES
Communications)
This port is dedicated for ES-ES Communications supported by either RS232 or RS485 signal
levels. The baud rate and protocol can be selected from the Front Panel. The port may be
configured for a number of communications protocols. Overhead data to/from the UIM is routed
to/from the framer/deframer. This port is also used by SCC Framing for the in-band data.
The Asynchronous Framing/Multiplexer is capable of multiplexing a relatively low-speed overhead
channel onto the terrestrial data stream resulting in a slightly higher combined or aggregate data
MN-DMD2050E Revision 2

Table 3-4. Reed-Solomon Codes

R-S Code (n, Bandwidth Expansion
k, t) [ (n/k) -1 ]
1
(126, 112, 7) 0.125
(126, 112, 7) 0.125
(126, 112, 7) 0.125
(126, 112, 7) 0.125
(126, 112, 7) 0.125
(126, 112, 7) 0.125
(126, 112, 7) 0.125
(126, 112, 7) 0.125
(225, 205,10) 0.0976
(219, 201, 9) 0.0896
(194, 178, 8) 0.0899
(194, 178, 8) 0.0899
(219, 201, 9) 0.0896
(219, 201, 9) 0.0896
(219, 201, 9) 0.0896
(219, 201, 9) 0.0896
(204, 188, 8) 0.0851
Theory of Operation
Interleaving Maximum
Depth 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 -
R-S Codec
2
3–58