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Comtech EF Data SNM-1000 User Manual

Page 11

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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