Comtech EF Data SDM-650B User Manual
Page 14
Table of Contents
SDM-650B Satellite Modem
x
Rev. 5
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