Comtech EF Data SNM-1000 User 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