SLM-3650 Satellite Modem
Revision 3
Preface
MN/SLM3650.IOM
v
3.5 Software
Configuration....................................................................................................................................3–78
3.6 Clocking Options ..............................................................................................................................................3–87
3.6.1 EIA-232,
EIA-422,
or V.35 Master/Master ...............................................................................................3–87
3.6.2 EIA-232,
EIA-422,
or V.35 Master/Slave .................................................................................................3–87
3.6.3 IDR/IBS
G.703 Master/Master ..................................................................................................................3–88
3.6.4 IDR/IBS
G.703 Master/Slave ....................................................................................................................3–88
3.6.5 D&I
G.703
Master/Master.........................................................................................................................3–94
3.7 Buffering............................................................................................................................................................3–94
3.7.1 Buffer
Size.................................................................................................................................................3–97
3.7.2 Converting
Between Bits and Seconds ......................................................................................................3–99
CHAPTER 4 THEORY OF OPERATION.........................................................................4–1
4.1 Monitor
and
Control (M&C)...........................................................................................................................4–1
4.1.1 Theory
of
Operation ..................................................................................................................................4–2
4.1.2 Remote
Baud Rate .....................................................................................................................................4–4
4.1.3 Remote
Address.........................................................................................................................................4–4
4.1.4 SLM-3650
Custom Modem Defaults.........................................................................................................4–5
4.2 Modulator..........................................................................................................................................................4–7
4.2.1 Modulator
Specifications...........................................................................................................................4–8
4.2.2 Theory
of
Operation ..................................................................................................................................4–11
4.2.3 Theory
of
Modulation Types .....................................................................................................................4–12
4.3 Demodulator .....................................................................................................................................................4–14
4.3.1 Demodulator
Specifications.......................................................................................................................4–15
4.3.2 Theory
of
Operation ..................................................................................................................................4–16
4.4 Decoder..............................................................................................................................................................4–18
4.5 Interface ............................................................................................................................................................4–19
4.5.1 Interface
Specifications..............................................................................................................................4–21
4.5.2 Plesiochronous/Doppler/Buffer .................................................................................................................4–24
4.5.3 Closed Network .........................................................................................................................................4–25
4.5.4 Open
Network............................................................................................................................................4–25
4.6
Backward Alarm Theory and Connections....................................................................................................4–26
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
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