Comtech EF Data SDM-650B Installation And Operation Manual page 13

SDM-650B Satellite Modem
3.6.1.1.1 Modem Settings (Master).......................................................................................................3-52
3.6.1.1.2 Modem Settings (Slave).........................................................................................................3-52
3.6.1.2 Master/Slave G.703 .......................................................................................................................3-53
3.6.1.3 Master/Slave X.21 .........................................................................................................................3-54
3.6.1.3.1 Modem Settings (Master).......................................................................................................3-54
3.6.1.3.2 Modem Settings (Slave).........................................................................................................3-54
3.6.1.4 Master/Slave External Station Clock.............................................................................................3-55
3.6.1.4.1 Modem Settings (Master).......................................................................................................3-55
3.6.1.4.2 Modem Settings (Slave).........................................................................................................3-55
3.6.2 Master/Master .......................................................................................................................................3-56
3.6.2.1 Master/Master (Customer Clock) ..................................................................................................3-56
3.6.2.1.1 Modem Settings (Master).......................................................................................................3-57
3.6.2.2 Master/Master (Station Clock) ......................................................................................................3-58
3.6.2.2.1 Modem Settings (Master).......................................................................................................3-59
CHAPTER 4. OPERATION........................................................................................ 4-1
4.1 Front Panel ...................................................................................................................................................4-2
4.1.1 LED Indicators........................................................................................................................................4-3
4.1.2 Controls ..................................................................................................................................................4-3
4.1.3 Menus and Options Overview ................................................................................................................4-4
4.1.4 Menu Explanations .................................................................................................................................4-9
4.1.4.1 Select Configuration........................................................................................................................4-9
4.1.4.2 Select Monitor ...............................................................................................................................4-15
4.1.4.3 Select Faults ..................................................................................................................................4-16
4.1.4.3.1 Modulator Faults (Mod_Flts).................................................................................................4-17
4.1.4.3.2 Demodulator/Decoder Faults (Dmd_Flts)..............................................................................4-17
4.1.4.3.3 Common Equipment Faults (CEq_Flts) .................................................................................4-17
4.1.4.4 Select Stored Faults (StFaults) ......................................................................................................4-18
4.1.4.5 Select Utility..................................................................................................................................4-19
CHAPTER 5. THEORY OF OPERATION.................................................................. 5-1
5.1 Modulator .....................................................................................................................................................5-1
5.1.1 Specifications..........................................................................................................................................5-3
5.1.2 Theory of Operation ...............................................................................................................................5-5
5.2 Sequential Decoder/Demodulator Processor .............................................................................................5-7
5.2.1 Specification ...........................................................................................................................................5-8
5.2.2 Theory of Operation ...............................................................................................................................5-9
5.2.2.1 Demodulator Processor ...................................................................................................................5-9
5.2.2.2 Sequential Decoder........................................................................................................................5-10
5.2.2.2.1 Sequential Decoder BER Performance Specifications...........................................................5-12
5.3 Demodulator ...............................................................................................................................................5-16
5.3.1 Specifications........................................................................................................................................5-17
5.3.2 Theory of Operation .............................................................................................................................5-17
5.4 Reacquisition, Fast Acquisition, and Directed Sweep.............................................................................5-18
5.4.1 Reacquisition ........................................................................................................................................5-18
5.4.2 Fast Acquisition ....................................................................................................................................5-19
5.4.3 Directed Sweep.....................................................................................................................................5-20
Rev. 5
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