Comtech-ef-data SNM-1000 User Manual Page 57
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SNM-1000 Node Control Modem Revision 3
Operation MN/SNM1000.IOM
3–15
3.4.1.3.6 INTERFACE:B-BAND LOOP BACK
B-BAND LOOP BACK
OFF
Programs the modem for baseband loopback operation, On or Off
.
When baseband loopback is turned on, the data and timing signals are switched from the
demodulator to the modulator on the modem side of the interface. The DTE baseband
signals are also looped back from the transmitter data and clock to receiver data and clock
on the customer side of the interface. This is a bi-directional loopback of the baseband data.
Refer to figure 3-4 for a block diagram of baseband loopback operation.
Upon entry, the status is displayed. Press [↑] or [↓] to make the selection. Press [ENTER]
to execute the change.
CUSTOMER
DATA
IBS OR IDR
INTERFACE
ENCODER/
MODULATOR
TRANSMIT RF
EQUIPMENT
ANTENNA
A
CPOWER
POWER SUPPLY
MICRO-
COMPUTER
REMOTE SERIAL
INTERFACE
FAULT INDICATORS
RECEIVE RF
EQUIPMENT
DEMODULATOR
/
DECODER
SATELLITE MODEM
Figure 3-4. Baseband Loopback
Note: When baseband loopback is turned on, data is looped back on the customer side of the interface.
This is a bi-directional loopback of the baseband data. This test mode will verify the customer equipment
and cabling between the modem and the customer equipment. The baseband loopback is not bi-directional
in D&I.
- Node Control Modem 1
- Installation and O 1
- SNM-1000 3
- Procedural Steps 4
- Network Support Customer Plan 5
- Table of Contents 7
- Preface MN/SNM1000.IOM 11
- Figures 12
- About this Manual 13
- Related Documents 13
- Conventions and References 13
- Cautions and Warnings 13
- Metric Conversion 14
- Trademarks 14
- Electrical Safety 15
- Environmental 15
- Installation 16
- IMPORTANT 17
- European EMC Directive 18
- Warranty Policy 19
- Limitations of Warranty 19
- Exclusive Remedies 19
- Disclaimer 19
- Chapter 1. INTRODUCTION 21
- 1.1 Overview 22
- 1.1.1 Additional Features 22
- 1.1.2 Mode of Operation 23
- 1.2 Description 24
- 1.3 Options 25
- 1.4 Specifications 26
- 1.4.1 General Specifications 26
- Introduction MN/SNM1000.IOM 27
- 1.4.3 DAC Specification 28
- 1.6 Dimensional Envelope 31
- Chapter 2. INSTALLATION 33
- 2.2 Installation 34
- Installation MN/SNM1000.IOM 35
- 2.3 Rear Panel Connections 36
- 2.3.1 EFBUS1/2 Port (J6) 37
- 2.3.3 User Port 39
- ≥ 0 dBm 42
- Chapter 3. OPERATION 43
- 3.1.1 LED Indicators 44
- 3.1.2 Front Panel Keypad 45
- 3.2 Menu System 46
- 3.3 Front Panel Menu 47
- 3.4 OPENING SCREEN 48
- MODEM REFERENCE 51
- INTERNAL 51
- CONFIGURATION 51
- DEMODULATOR 51
- TX CLOCK PHASE 55
- EXT-CLK FREQ 55
- 1544.000 KHZ 55
- BUFFER CLOCK 56
- RX (SATELLITE) 56
- RX CLOCK PHASE 56
- B-BAND LOOP BACK 57
- BUFFER SIZE 58
- 384 BITS 58
- BUFFER CENTER 58
- 3.4.1.4 CONFIGURATION:SAVE 59
- 3.4.2.1 MONITOR:RAW BER 60
- 3.4.2.3 MONITOR:EB/NO 61
- 3.4.2.6 MONITOR:BUFFER FILL 61
- FUNCTION SELECT 62
- FAULTS/ALARMS 62
- MODULATOR 63
- + 63
- +-++ 63
- TX INTERFACE 64
- 64
- RX INTERFACE 65
- STORED FLTS/ALAMS 67
- Reed-Solomon option only 70
- UTILITY 71
- 3.4.5.1 UTILITY:MODULATOR 72
- 3.4.5.1.7 MODULATOR:TX MODE 74
- 3.4.5.2 UTILITY:DEMODULATOR 75
- 3.4.5.3 UTILITY:INTERFACE 77
- 3.4.5.4 UTILITY:NETWORK 80
- 3.4.5.4.1 NETWORK:RELEASE 80
- 3.4.5.5 UTILITY:SYSTEM 81
- 3.4.5.5.1 SYSTEM:TIME/DATE 81
- 3.4.5.5.4 SYSTEM:REMOTE TYPE 82
- MASTER RESET 86
- HARD/SOFT 86
- 3.4.5.6 UTILITY:MODEM TYPE 87
- MODEM OPTIONS 89
- 3.5 User Port Operation 92
- 3.6.1 User Port Modem 93
- 3.6.2 Remote Site Modem 93
- 3.7 SNM-1000 Commands 94
- 3.7.1 Character Set 94
- 3.7.3 Message Structure 94
- 3.7.3.1 Prefix 94
- 3.7.3.2 Message Body 95
- 3.7.3.3 End Character 95
- 3.7.3.4 Case Sensitivity 95
- 3.7.3.5 Delimiters 95
- 3.7.3.6 End Character 95
- 3.7.3.7 Queries 96
- 3.7.4 Node Address (NA) 96
- 3.7.4.1 Command Format 96
- SNM-1000 transmit power 98
- 3.7.12 SNM-1000 Mode (MD) 100
- 3.7.12.1 Command Format 100
- 3.7.13.1 Help Screen 101
- 3.7.13.2 Flash Updates 101
- 3.7.13.6 Ram Test 102
- 3.7.13.3 PDREM Ram 102
- 3.7.13.4 Area1 Defaults 102
- 3.7.13.5 Area2 Defaults 102
- 3.7.15.1 Command Format 104
- 3.7.16 Channel Type (CT) 104
- 3.7.16.1 Command Format 104
- 3.7.17.1 Command Format 105
- 3.7.18 Data Call 106
- 3.7.18.1.1 Command Format 106
- Operation MN/SNM1000.IOM 107
- 3.7.18.2.1 Command Format 108
- 3.7.19 Terminate (TE) 108
- 3.7.19.1 Command Format 108
- 3.7.20.1 Command Format 109
- 3.7.20.3 Example 110
- 3.7.21.1 Command Format 111
- 3.7.22.1 Command Format 112
- 3.7.23.1 Command Format 113
- 3.7.24.1 Command Format 114
- 3.7.25.1 Command Format 115
- 3.7.26.1 Command Format 116
- 3.7.27 Port Redirection 116
- 3.7.28.1 Command Format 117
- (part of J1) 120
- CONNECTOR 120
- 4.1.1 Specifications 121
- 4.1.2 Theory of Operation 121
- 4.1.2.1 User Port 121
- 4.1.4 Monitor and Control 122
- 4.1.5 Non-Volatile Memory 123
- 4.1.6 User Port 123
- 4.2 Modulator 124
- 4.2.1 Theory of Operation 126
- 4.2.1.1 Burst Mode 126
- 4.2.2.1 QPSK Encoding 127
- 4.3 Demodulator 128
- 4.3.1 Theory of Operation 129
- 4.3.1.1 Continuous Mode 129
- Chapter 5. MAINTENANCE 131
- 5.1.1 System Faults/Alarms 132
- Maintenance MN/SNM1000.IOM 133
- 5.1.2 Faults/Alarms Display 136
- 5.1.3 Faults/Alarms Analysis 136
- 5.1.3.1 Modulator Faults 137
- 5.1.3.1.1 Modulator Checkout 138
- 5.1.3.2 Demodulator Faults 141
- WITH NOISE 143
- WITHOUT NOISE 143
- Appendix A. REMOTE CONTROL 149
- OPERATION 149
- A.2.1 Character Set 150
- A.2.3 Message Structure 150
- Command: 152
- is added to the 152
- (MPO_) 152
- A.5.1 Interface Buffer Size 158
- A.6.1 Modem Type Commands 160
- A.7 Configuration Status 160
- Modulator Output Power 161
- A.7.1 Modem Faults Status 163
- A.8 Stored Faults 168
- A.9 Unsolicited Responses 177
- A.9.1 Messages from NMS 177
- A.9.2 List of Cause Codes 178
- METRIC CONVERSIONS 183
- Units of Length 183
- Temperature Conversions 183
- Units of Weight 183
- 480 • 333 • 2200 PHONE 184
- 480 • 333 • 2161 184
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