Comtech EF Data SDM-650B Installation And Operation Manual page 14

Table of Contents
CHAPTER 6. MAINTENANCE................................................................................... 6-1
6.1 System Checkout ..........................................................................................................................................6-1
6.1.1 Modulator ...............................................................................................................................................6-1
6.1.2 Demodulator ...........................................................................................................................................6-2
6.1.3 Test Points ..............................................................................................................................................6-8
6.1.3.1 Modulator ........................................................................................................................................6-8
6.1.3.2 Demodulator....................................................................................................................................6-9
6.1.3.3 Sequential Decoder/Demod Card ..................................................................................................6-10
6.2 Fault Isolation.............................................................................................................................................6-11
6.2.1 Modulator Faults (Mod_Flts Menu) .....................................................................................................6-11
6.2.2 Demodulator/Decoder Faults (Dmd_Flts Menu) ..................................................................................6-12
6.2.3 Common Equipment Faults (CEq_Flts Menu) .....................................................................................6-14
6.3 Interface Fault Isolation ............................................................................................................................6-15
6.3.1 Transmit Faults (TX_INTF) .................................................................................................................6-15
6.3.2 Receive Faults (RX_INTF)...................................................................................................................6-16
6.4 Module Replacement .................................................................................................................................6-21
6.5 Module Identification.................................................................................................................................6-21
APPENDIX A. DATA RATES AND FILTERS............................................................A-1
A.1 Fixed Rate Filters ....................................................................................................................................... A-1
A.1.1 Data Rate Change Instructions.............................................................................................................. A-1
A.1.2 Hardware Configuration ....................................................................................................................... A-5
A.2 Variable Rate Filters.................................................................................................................................. A-6
A.2.1 Data Rate Change Instructions.............................................................................................................. A-6
A.2.2 Hardware Configuration ....................................................................................................................... A-7
A.2.3 Utility .................................................................................................................................................... A-9
APPENDIX B. REMOTE CONTROL OPERATION ...................................................B-1
B.1 Standard Version........................................................................................................................................ B-1
B.1.1 General .................................................................................................................................................. B-2
B.1.2 Message Structure ................................................................................................................................. B-2
B.1.2.1 Start Character ............................................................................................................................... B-2
B.1.2.2 Device Address.............................................................................................................................. B-3
B.1.2.3 Command/Response ...................................................................................................................... B-4
B.1.2.4 End Character ................................................................................................................................ B-4
B.1.3 Configuration Commands/Responses ................................................................................................... B-5
B.1.3.1 Set Modulator Frequency............................................................................................................... B-5
B.1.3.2 Set RF Output ................................................................................................................................ B-5
B.1.3.3 Set Demodulator Frequency .......................................................................................................... B-5
B.1.3.4 Set Modulator Power Offset .......................................................................................................... B-6
B.1.3.5 Set Modulator Output Power Level ............................................................................................... B-6
B.1.3.6 Modulator Rate .............................................................................................................................. B-7
B.1.3.6.1 Modulator Filter Rate Assignment ......................................................................................... B-7
B.1.3.6.2 Select Modulator Rate ............................................................................................................ B-8
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SDM-650B Satellite Modem
Rev. 5