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System and Design Manual, Revision 2
Introduction 1–1
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This document contains the System and Design information of the Comtech
EF Data’s Bandwidth-on-Demand (BOD) Multimedia Integrated Digital
Access System (MIDAS), Series 4 (Version 4.0, 4.2, and subsequent). The
version number in the margin will identify differences.
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A reliable and efficient communication network is of prime importance in
today’s highly competitive business world. The need for accurate (real-time)
information is crucial to the success of any business requiring on-demand
wide-area connectivity for:
• Enterprise Networking • Video Conferencing
• Circuit Restoral (Disaster
Recovery)
• Tele-Medicine/Tele-
Health
• Overflow/Congestion
Reduction
• Distance Learning
• Content Distribution
Until now, these applications depended on leased lines from the telephone
company, which were mostly under-utilized and (typically) did not provide
adequate bandwidth when needed. In some places, they simply did not exist.
• Dial-up lines were slower, because of limited bandwidth availability
on Public Switched Telephone Network (PSTN) lines in most
geographic regions.
• The reliability and maintenance of these circuits continues to be a
problem, and lack of network control provisions continues to plague
users.
• Natural or man-made disasters.
Dedicated satellite circuits can solve the bandwidth and connectivity problem,
but such solutions are not cost effective for applications that do not require
permanent connectivity.
• Users with mission-critical applications adopted dedicated circuits
where local phone company service was unreliable or nonexistent.
• The dial-up equivalent of setting up a satellite circuit, though cost
effective, was highly inefficient.
• Most users were certainly not enthused by setup times ranging
anywhere from a few hours to a few days for such a circuit.
M
U
LTIMEDIA INTE
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RATED DI
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- 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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