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System and Design Manual, Revision 2
4–6 Network Management System
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The Comtech EF Data's SNM-1002 LinkSync™ Modem is responsible for
monitoring the receive frequency and the receive E
b
/N
o
of the outbound
control channel at the MIDAS Controller site.
The outbound control channel is used as the frequency and power reference
for LinkSync™ calculations. The modem also is used for transmitting the
interfering carrier to terminate circuits involving integrated traffic/control
modems and/or network terminals.
System Specifications
Operating IF Range 50 to 180 MHz, in 1 Hz steps
Digital Data Rate:
Receive 19.2 kbps
Transmit 2.4 kbps to 4.375 Mbit/s
Demodulation QPSK 1/2 rate
Modulation BPSK 1/2 rate
QPSK 1/2, 3/4, and 7/8 rates
Forward Error Correction Viterbi, K=7, 1/2, 3/4 and 7/8 rates
Data Scrambling Intelsat V.35
External Reference Input 1, 5, 10, 20 MHz
Modulator Specifications
Output Power -5 to -30 dBm, adjustable in 0.1 dB steps
Output Spurious < -55 dBc, 0 to 500 MHz (4 kHz band)
Output Spectrum Meets IESS-308/309 power spectral mask
Output Return Loss > 20 dB
Output Impedance
75Ω (Optional: 50Ω)
Data Clock Source Internal or External
Demodulator Specifications
Input Power
Desired Carrier -30 to -55 dBm
Maximum Composite -5 dBm or +40 dBc
Input Impedance
75Ω (Optional: 50Ω)
Input Return Loss > 20 dB
Carrier Acquisition Range ± 35 kHz, from 100 Hz to 35 kHz in 1Hz steps
Acquisition Time
19.2 kbps, QPSK, R=1/2
< 2 second
Sweep Reacquisition 0 to 999 seconds, in 1 second steps
Data Clock Internal, External, TX, Recovered RX
Monitor & Control Specifications
Interface Type EIA-232
Data Rate 19.2 kbps
Commands ASCII
- MIDAS Series 4 3
- System and Design Manual 3
- Network Customer Support 4
- Preface iii 5
- Preface iv 6
- Preface v 7
- Preface vi 8
- Table of Contents 9
- Preface viii 10
- Preface ix 11
- Preface x 12
- Figures 13
- About this Manual 14
- Metric Conversion 14
- Trademarks 14
- Concerning this Manual 14
- Introduction 1–1 15
- 1–2 Introduction 16
- Introduction 1–3 17
- 1–4 Introduction 18
- Introduction 1–5 19
- SNM-1001 Network 20
- Control Modem 20
- SNM-1002 20
- LinkSync Modem 20
- Traffic Node 20
- Single-Channel 21
- Multi-Channel 22
- Control Channels 23
- Network Topology 23
- Network 24
- Solutions 2–1 25
- 2–2 Solutions 26
- User Port Commands 27
- MIDAS Operator 28
- Workstation 28
- Automatic Request 28
- RTS/DTR Triggered 28
- User Port Triggered 29
- IP Route 29
- 2–6 Solutions 30
- Solutions 2–7 31
- 2–8 Solutions 32
- Solutions 2–9 33
- 2–10 Solutions 34
- Solutions 2–11 35
- 2–12 Solutions 36
- Solutions 2–13 37
- Chairperson 38
- Participant 38
- Capability 38
- Videoconference 38
- Session 38
- Initiation 39
- Broadcaster/Return 39
- Channel 39
- Termination 40
- Solutions 2–17 41
- 2–18 Solutions 42
- Theory of Operation 3–1 43
- 3–2 Theory of Operation 44
- Data Rate 45
- User data rate in kbps 45
- Example 46
- ALL FREQUENCIES ARE IN kHz 47
- 3–6 Theory of Operation 48
- MIDAS Controller 49
- 3–8 Theory of Operation 50
- 3–10 Theory of Operation 52
- Circuit Setup 53
- Circuit Termination 54
- NODE A NMS NODE B 55
- 3–14 Theory of Operation 56
- 3–16 Theory of Operation 58
- 3–18 Theory of Operation 60
- IMPORTANT 62
- Operator Functions 5–1 71
- 5–2 Operator Functions 72
- Operator Functions 5–3 73
- Figure 5-2. System Setup 73
- 5–4 Operator Functions 74
- Operator Functions 5–5 75
- 1 to 30 76
- Operator Functions 5–7 77
- 5–8 Operator Functions 78
- Operator Functions 5–9 79
- 5–10 Operator Functions 80
- Operator Functions 5–11 81
- 5–12 Operator Functions 82
- Operator Functions 5–13 83
- 5–14 Operator Functions 84
- Operator Functions 5–15 85
- 5–16 Operator Functions 86
- Operator Functions 5–17 87
- Figure 5-15. Event Log 87
- 5–18 Operator Functions 88
- 5–20 Operator Functions 90
- Operator Functions 5–21 91
- Figure 5-18. Active Calls 91
- 5–22 Operator Functions 92
- Operator Functions 5–23 93
- 5–24 Operator Functions 94
- Operator Functions 5–25 95
- 5–26 Operator Functions 96
- Operator Functions 5–27 97
- 5–28 Operator Functions 98
- Traffic Node 6–1 99
- 6–2 Traffic Node 100
- Traffic Node 6–3 101
- 6–4 Traffic Node 102
- Traffic Node 6–5 103
- 6–6 Traffic Node 104
- Traffic Node 6–7 105
- CDM-550T 107
- CIM-300L 109
- SDM-300A 111
- SDM-300L 112
- SDM-2020M 113
- SDM-2020D 114
- SDM-8000 115
- SNM-1010 116
- SNM-1010L 117
- IDC-150D 118
- SDM-150 119
- Data/Symbol Rates 119
- SDM-300 119
- SDM-6000 120
- 6–24 Traffic Node 122
- Table 6-1. User Port Pinout 122
- Signal type EIA-485 123
- 6–26 Traffic Node 124
- METRIC CONVERSIONS 125
- Units of Length 125
- Temperature Conversions 125
- Units of Weight 125
- 480 • 333 • 2200 PHONE 126
- 480 • 333 • 2161 126
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