Comtech EF Data SDM-650B User Manual
Page 13
SDM-650B Satellite Modem
Table of Contents
Rev. 5
ix
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