Operating instructions

DMD20/DMD20 LBST Universal Satellite Modem Appendix D
TM103 – Rev. 2.8 D-5
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
D.1.1 Operational Case Examples
For best results always begin setup by setting the data rate to 512 Kbps.
This data rate is applicable for all modes and as such provides a
convenient launch point for setting up the modem. Any mode of
operation can be entered from this starting point.
Case 1: IDR 8.448 Mbps, 3/4 Rate Viterbi
Starting with the Data Rate = 512 Kbps
Modulator:
Method 1 -
Under Interface Menu:
Set Interface type
Set Tx clock selection
Set mode to IDR
Under Mod Data Menu:
Set code rate to 3/4 VIT
Set data rate for 8448000
Under Mod IF Menu: Set desired Tx frequency and power level
Turn IF ON
Method 2 -
Under Interface Menu:
Set Interface type
Set Tx clock selection
Set Mod strap code to: 128
Under Mod IF Menu: Set desired Tx frequency and power level
Turn IF on