Comtech EF Data OM20 - Manual (Page 212)

OM20 Universal Outdoor Modem Appendix G
MN-OM20– Revision 5 G–8
Case 3: Closed Network, 3/4 Rate Viterbi, IBS Overhead
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 Framing for 1/15
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: 101
Under Mod IF Menu: Set desired Tx frequency and power level
Turn IF on
Demodulator:
Method 1 -
Under Interface Menu:
Set Interface type
Set Buff clock selection
Set Buffer Size
Set mode to: Closed Net
Under Demod IF Menu: Set desired Rx frequency
Under Demod data Menu:
Set code rate to 3/4 VIT
Set Framing for 1/15
Method 2 -
Under Interface Menu:
Set Interface type
Set Buff clock selection
Set Buffer Size
Set Demod strap code to: 101
Under Demod IF Menu: Set desired Rx frequency