Comtech EF Data DMD-2050E - Manual (Page 100)

DMD2050E Universal Satellite Modem Theory of Operation
MN-DMD2050E Revision 2 3–58
Table 3-4. Reed-Solomon Codes
Type of
Service Data Rate
(Kbps)
R-S Code (n,
k, t) 1
Bandwidth Expansion
[ (n/k) -1 ]
Interleaving
Depth
Maximum 2 R-S Codec
Delay (ms)
Small IDR
(With 16/15
O/H) 64
128
256
384
512
768
1024
1536 (126, 112, 7)
(126, 112, 7)
(126, 112, 7)
(126, 112, 7)
(126, 112, 7)
(126, 112, 7)
(126, 112, 7)
(126, 112, 7) 0.125
0.125
0.125
0.125
0.125
0.125
0.125
0.125 4
4
4
4
4
4
4
4 115
58
29
19
15
10
8
5
IDR
(With 96 Kbps
O/H) 1544
2048
6312
8448 (225, 205,10)
(219, 201, 9)
(194, 178, 8)
(194, 178, 8) 0.0976
0.0896
0.0899
0.0899 4
4
4
4 9
7
2
<2
8PSK 1544
2048
6312
8448 (219, 201, 9)
(219, 201, 9)
(219, 201, 9)
(219, 201, 9) 0.0896
0.0896
0.0896
0.0896 8
8
8
8 18
13
4
3
DVB All (204, 188, 8) 0.0851 12 -
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