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OM20 Universal Outdoor Modem
i. ES BAUD RATE {150 - 115200}
ii. This allows the user to select the baud rate of the ASYNC port (J17) in SCC
7. Under TX ASYNC MODE Menu, set the desired ES BITS/CHAR:
i. ES BITS/CHAR {7,8}
ii. This allows the user to choose between 7 or 8 bits of data.
8. Repeat Steps 4 through 7 under the RX ASYNC MODE (menu)
9. The physical connection to the overhead channel will be the DB-9 Female Port labeled ASYNC
(J17).
Modem Data Rate
Kbps
9.6
9.6
9.6
9.6
9.6
9.6
9.6
9.6
9.6
9.6
9.6
9.6
9.6
9.6
512
512
512
512
512
512
512
MN-OM20– Revision 5
Mode.
SCC Overhead Chart Examples
(Viterbi 3/4 w/V.35 Scrambler)
SCC Control
In-Band Overhead
Channel Rate
1/1
1/2
1/3
1/4
1/5
1/6
1/7
1/1
1/2
1/3
1/4
1/5
1/6
1/7
1/1
1/2
1/3
1/4
1/5
1/6
1/7
Rate Setting
300
300
300
300
300
300
300
9600
9600
9600
9600
9600
9600
9600
9600
9600
9600
9600
9600
9600
9600
OM20 Theory of Operation
Symbol Rate
6800
6700
6667
6650
6641
6634
6629
19200
17067
15543
14400
14400
14400
14400
354165
350948
349867
349346
349201
348802
348658
4–26
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