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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

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Comtech-ef-data OM20 Manuale Utente Pagina 212