Comtech-ef-data CDM-550T Instrukcja Użytkownika Pobierz pdf (Strona 84)

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CDM-550T Satellite Modem Revision 3

Forward Error Correction Options MN/CDM550T.IOM

Figure 7-3 Sequential Decoding 1024 kbps

1E-9

1E-8

1E-7

1E-6

1E-5

1E-4

1E-3

1E-2

1E-1

1 2 3 4 5 6 7 8 9 10 11 12

Eb/No in dB

Specification

limit Rate 1/2

Coding

Uncoded BPSK/QPSK

Typical

Performance

Specification

limit, Rate 3/4

Coding

1 2 3 4 5 6 7 8 9 10 11 12

Specification

limit, Rate 7/8

Coding

BER

Sequential

Decoding

1024 kbps

7–10

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 163 164

Satellite Modem 1
CDM-550T 3
Table of Contents 5
Figures 13
Preface 15
Preface MN/CDM550T.IOM 16
Electrical Safety 17
Environmental 17
Installation 17
Warranty Policy 19
Limitations of Warranty 19
Exclusive Remedies 20
Chapter 1. INTRODUCTION 21
1.2.1 AUPC 22
1.2.2 Software 22
1.2.3 Verification 22
1.2.4 Data Interfaces 22
1.3 Options 23
1.4 Compatibility 23
1.5 Manual Release Notes 23
Introduction MN/CDM550T.IOM 24
Chapter 2. INSTALLATION 25
2.3 Configuration 26
2.4 Select Internal IF Loop 26
2.5 Connect External Cables 26
Chapter 3. FUNCTIONAL 27
DESCRIPTION 27
Receive Data 28
Chapter 4. PHYSICAL 29
5.1 Connector Overview 33
Vacuum Fluorescent Display 37
LED Indicators 37
6.2 Menu Trees 39
6.2.1 Opening Screen 40
6.2.3 SELECT: CONFIG 41
(CONFIG: TX, FEC) 43
6–10 46
6–14 50
(CONFIG: RX) CLK (Clocking) 52
6.2.3.4.1 (CONFIG: LOCAL) 56
6.2.3.4.2 (CONFIG: REMOTE) 56
6–22 58
SEL TX-AIS ALARM MASK: 60
ACTIVE MASKED(PRESS ENT) 60
SELECT IF IMPEDANCE: 60
50 OHMS 75 OHMS (ENTER) 60
6.2.4 SELECT: TEST 61
Figure 6-4. Loopback Modes 62
6–28 64
6.2.6.1 (MONIT:) ALARMS 66
TX TRAFFIC: NO CLOCK 67
DETECTED FROM INTERFACE 67
RX:EbNo=05.7dB dF=+11.7k 67
BER=3.4E-9 BUF=50 AGC=24 67
6–32 68
(MONIT: STATS) VIEW 69
(MONIT: STATS) CONFIGURE 70
6.2.6.4 (MONITOR) AUPC 71
6.2.7.1 (STORE/LD) STORE 71
6.2.7.2 (STORE/LD) LOAD 72
6–38 74
Chapter 7. FORWARD ERROR 75
CORRECTION OPTIONS 75
7.3 Sequential 76
Decoding 82
Sequential 83
1024 kbps 84
2048 kbps 85
Viterbi with 86
RS 220,200 86
Outer Code 86
Differential 89
Encoding 89
Chapter 8. OFFSET QPSK 91
OPERATION 91
MN/CDM550T.IOM 92
Chapter 9. RS-232 DATA 93
INTERFACE - ASYNCHRONOUS 93
9.4 Other Considerations 94
9.4.1 Baud Rate Accuracy 94
Chapter 10. CLOCKING MODES 95
10–2 96
10–4 98
Figure 10-2 . RX Clock Modes 99
10–6 100
Chapter 11. EDMAC CHANNEL 101
11.2 M&C Connection 102
11.3 Setup Summary 103
POWER CONTROL 105
12.2.1 Target Eb/No 106
12.2.2 Max Range 106
12.2.3 Alarm 106
12.2.4 Demod Unlock 107
12.3 Compensation Rate 107
12.4 Monitoring 107
Chapter 13. FLASH UPGRADING 109
14.1 MODULATOR 111
14.2 Demodulator 113
14.4 Data Interfaces 114
14.5 Miscellaneous 115
14.6 Async Overhead 115
14.7 Approvals 115
Chapter 15. REMOTE CONTROL 117
15.3 RS-232 118
15.4 Basic Protocol 118
15.5 Packet Structure 118
15.5.1 Start Of Packet 119
15.5.2 Address 119
15.5.3 Instruction Code 119
15.5.5 Message Arguments 120
15.5.6 End Of Packet 121
15.6.4 Remote Queries 136
15.6.5 Bulk Commands 139
A.1 Overview 141
Cable Drawings 144
MN/CDM550T.IOM 144
Appendix B. E 145
MEASUREMENT 145
Appendix C. ASYNC OVERHEAD 149
• • • 150
IMPORTANT 153
D.2 Menu Trees 154
D.2.2 SELECT: ODU 155
METRIC CONVERSIONS 163
Units of Length 163
Temperature Conversions 163
Units of Weight 163
480 • 333 • 2200 PHONE 164
• 333 • 2161 FAX 164

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