Specifications

DMD20/20LBST Universal Satellite Modem Strap Codes
MN-DMD20-20LBST Revision 14 D–5
Table D-1. Strap Codes
Dis = Disable
Strap Code
(Decimal)
Data Rate (Kbps)
Overhead
Code Rate
Type
Framing Type
Scrambler Type
Drop and Insert
Reed-Solomon
Modulation
Mode
176 4000 1 1/2 VIT NONE V.35 (IESS) Dis Dis QPSK CNT
116 4000 1 3/4 VIT NONE V.35 (IESS) Dis Dis QPSK CNT
60 1344 16/15 3/4 VIT IBS IBS Dis Dis QPSK CNT
D.2 Sample Applications
The following section provides brief application notes for operating the modem and explains by
example how to configure the modem for some of the most popular configurations.
The following information illustrates the allowable combinations for Mode and Data Rate.
Allowable Combinations: Mode/Rate/Framing.
IDR:
8.448 Mbps 3/4, 7/8 Rate FEC
6.312 Mbps 1/2, 3/4, 7/8 Rate FEC
2.048 Mbps 1/2, 3/4, 7/8 Rate FEC
1.544 Mbps or Below 1/2, 3/4, 7/8 Rate FEC
IBS:
2.048 Mbps or below 1/2, 3/4, 7/8 Rate
Closed Network:
8.448: 96 Kb Framing or No Framing, 3/4, 7/8 Rate FEC
6.312: 96 Kb Framing or No Framing, 1/2, 3/4, 7/8 Rate FEC
2.048: 96 Kb Framing or 1/15 Framing or No Framing, 1/2, 3/4,
7/8 Rate FEC
1.544: 96 Kb Framing or 1/15 Framing or No Framing, 1/2, 3/4,
7/8 Rate FEC
Any Rate 2.048 & lower: 1/15 Framing or No Framing, 1/2, 3/4, 7/8 Rate FEC