Comtech EF Data SNM-1002 - Manual (Page 11)

SNM-1002 LinkSync™ Modem Revision 2
Preface MN/SNM1002.OM
ix
CHAPTER 4. THEORY OF OPERATION ................................................................. 4–1
4.1 Monitor and Control (M&C) ..................................................................................................... 4–1
4.2 Modulator .................................................................................................................................... 4–3
4.2.1 Modulator Specifications ...................................................................................................................... 4–5
4.2.2 Theory of Operation.............................................................................................................................. 4–6
4.2.3 Theory of Modulation Types................................................................................................................. 4–7
4.3 Demodulator ................................................................................................................................ 4–9
4.3.1 Demodulator Specifications .................................................................................................................. 4–10
4.3.2 Theory of Operation.............................................................................................................................. 4–11
CHAPTER 5. MAINTENANCE.................................................................................. 5–1
5.1 System Checkout ......................................................................................................................... 5–1
5.1.1 Interface Checkout ................................................................................................................................ 5–2
5.1.2 Modulator Checkout.............................................................................................................................. 5–3
5.1.3 Demodulator Checkout ......................................................................................................................... 5–6
5.2 Fault Isolation.............................................................................................................................. 5–8
5.2.1 System Faults/Alarms ........................................................................................................................... 5–8
5.2.2 Faults/Alarms Display........................................................................................................................... 5–12
5.2.3 Faults/Alarms Analysis ......................................................................................................................... 5–12
APPENDIX A. REMOTE CONTROL OPERATION..................................................A–1
APPENDIX B. REDUNDANT WIRING SCHEMATIC...............................................B–1