Comtech EF Data SNM-1000 - Manual (Page 11)

SNM-1000 Node Control Modem Revision 3
Preface MN/SNM1000.IOM
ix
3.7.12 SNM-1000 Mode (MD) .............................................................................................................................3–61
3.7.13 Built-In Diagnostic Tests (EFD_DIAG) ....................................................................................................3–61
3.7.14 Echo (ECHO).............................................................................................................................................3–64
3.7.15 Setup Override (SETUP) ...........................................................................................................................3–64
3.7.16 Channel Type (CT) ....................................................................................................................................3–65
3.7.17
Modem Command Sequence (MC) ...........................................................................................................3–66
3.7.18 Data Call ....................................................................................................................................................3–67
3.7.19 Terminate (TE) ..........................................................................................................................................3–69
3.7.20 Initiate Multipoint Data Call (MI) .............................................................................................................3–70
3.7.21 Add Multipoint Data Circuit (MA)............................................................................................................3–72
3.7.22 Drop Multipoint Data Circuit (MT) ...........................................................................................................3–73
3.7.23 Change Forward Channel for Multipoint Data Circuit (MF).....................................................................3–74
3.7.24 Change Return Channel for Multipoint Data Circuit (MR) .......................................................................3–75
3.7.25 Send Message to Multipoint Data Circuit Originator (MO) ......................................................................3–76
3.7.26 Send Message to Multipoint Data Circuit Listeners (ML).........................................................................3–77
3.7.27 Port Redirection .........................................................................................................................................3–77
3.7.28 Debugging with the User Port....................................................................................................................3–78
CHAPTER 4. THEORY OF OPERATION........................................................................ 4–1
4.1 Demand Assignment Controller (DAC)..........................................................................................................4–1
4.1.1 Specifications.............................................................................................................................................4–3
4.1.2 Theory
of Operation ..................................................................................................................................4–3
4.1.3 EFBUS1/2 Port (External) .........................................................................................................................4–4
4.1.4 Monitor and Control ..................................................................................................................................4–4
4.1.5 Non-Volatile Memory................................................................................................................................4–5
4.1.6 User
Port ....................................................................................................................................................4–5
4.1.7 M&C Theory of Operation ........................................................................................................................4–5
4.2 Modulator..........................................................................................................................................................4–6
4.2.1 Theory of Operation ..................................................................................................................................4–8
4.2.2 Theory of Modulation Types .....................................................................................................................4–9
4.2.3 Modulator Specifications...........................................................................................................................4–10
4.3 Demodulator .....................................................................................................................................................4–11
4.3.1 Theory of Operation ..................................................................................................................................4–12
4.3.2 Demodulator Specifications.......................................................................................................................4–12
CHAPTER 5. MAINTENANCE ........................................................................................ 5–1
5.1 Fault Isolation ...................................................................................................................................................5–1
5.1.1 System Faults/Alarms ................................................................................................................................5–2
5.1.2 Faults/Alarms Display ...............................................................................................................................5–6
5.1.3 Faults/Alarms Analysis..............................................................................................................................5–6
APPENDIX A. REMOTE CONTROL OPERATION .......................................................... A–1