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System and Design Manual, Revision 2
Network Management System 4–5
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The Comtech EF Data’s SNM-1001 Network Control Modem allows
communication with the traffic nodes over the control channels. It transmits on
the outbound control channel to the traffic nodes and receives the incoming
messages from the traffic nodes on the inbound control channel.
The outbound control channel is a continuous, Time Division Multiplexed
(TDM) channel transmitted by the MIDAS Controller to all the traffic nodes
in the network. The inbound control channel is a burst channel using Slotted
Aloha access protocol. The traffic nodes send requests and report status to the
MIDAS Controller and respond to MIDAS Controller commands.
System Specifications
Operating IF Range 50 to 180 MHz, in 100 Hz steps
Continuous Mode: TX only :
Digital Data
QPSK, 1/2 rate, 19.2 kbps
Forward Error Correction Viterbi soft decision
Doppler Buffer 64 to 65536 bits, or 1 to 50 ms in total depth
Data Scrambling Intelsat V.35
Burst Mode: RX only
Digital Data
QPSK, 1/2 rate, 19.2 kbps
Forward Error Correction Viterbi soft decision
Carrier Acquisition Range ± 4 kHz at E
b
/N
0
= 8 dB, > 99% probability
Acquisition Time:
19.2 kbps, QPSK, R=1/2
< 30 ms
Data Interfaces EIA-422/449
Phase Noise Per IESS-308
Modulator Specifications
Output Power -5 to -30 dBm, adjustable in 0.1 dB steps
Spurious -55 dBc (4 kHz)
Data Clock Source Internal or External
Internal Clock Stability
± 1 x 10
-5
Output Impedance
75Ω
Output Return Loss
≥ 20 dB
Demodulator Specifications
Input Level (Desired Carrier) -30 to -55 dBm
Maximum Composite Carrier -5 dBm or +30 dBc, within 2 MHz of desired carrier
Input Impedance
75Ω
Input Return Loss
≥ 20 dB
Monitor & Control Specifications
Serial 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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