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7-1
Chapter 7
Basic Cable Testing
Chapter 7 provides the following information:
• A description of LAN cable construction.
• Definitions and explanations of attenuation, noise, characteristic impedance,
crosstalk, near-end crosstalk (NEXT), NVP, ACR, and RL.
• Explanations of the TDR and TDX analyzer tests and plots.
• Basic troubleshooting procedures for LAN cable.
LAN Cable Construction
LAN cables have a number of characteristics in common with other types of
electrical cables. All electrical cables have continuity, which means that they
serve as a complete path for electrical current flow. Each end of a cable has some
type of connector for connecting the cable to the appropriate electrical device.
Cables with multiple wires usually have a pin assignment that describes how the
wires are arranged in the connectors.
- DSP-100/2000 1
- Table of Contents 3
- Contents 5
- List of Tables 7
- List of Figures 9
- Introduction 11
- Standard Accessories 13
- Using This Manual 15
- Getting Started 17
- Quick Start 19
- Powering the Test Tool 19
- Using the Menus 19
- Quick Configuration 21
- Results within Accuracy Range 22
- Autotest on Coaxial Cable 27
- DSP-100 DSP-2000 28
- Main Unit Features 29
- Remote Features 31
- Rotary Switch 33
- Autotest 33
- Single Test 34
- Special Functions 36
- Smart Remote (Model DSP-100) 36
- Turning On the Test Tool 37
- Performing a Self-Test 37
- Overvoltage Test 38
- Noise Test 38
- Controlling the Backlight 38
- Configuring the Test Tool 39
- Selecting a Conduit Setting 41
- Selecting a Length Unit 42
- Selecting a Numeric Format 42
- Setting the Date and Time 43
- Setting the Power-Down Timer 44
- Remote Communication Error 47
- Wire Map Test 54
- Resistance 56
- NEXT Test 60
- NEXT@REMOTE Results 62
- ACR Results 62
- ACR@REMOTE 65
- RL@REMOTE (Model DSP-2000) 66
- DSP-2000 68
- CABLE ANALYZER 68
- Saving Autotest Results 71
- The Autotest Report 73
- If Memory is Full 73
- Running Individual Tests 77
- When to Use a Remote Unit 79
- Running the TDX Analyzer 82
- The TDX Analyzer 83
- TDX Analyzer Results 83
- TDX Analyzer Plot 84
- The TDR Test 85
- How to Terminate the Cable 85
- TDR Results Screen 87
- TDR Plot Screen 87
- Monitoring Network Activity 92
- Monitoring Impulse Noise 97
- Noise Test Results 99
- Chapter 5 101
- Configuring the Serial Port 102
- Printer Interface Cable 102
- Printing 102
- Printing Test Reports 103
- Calibrations and Custom Test 107
- Standards 107
- NVP Calibration 109
- Configuring a Custom Cable 111
- Basic Cable Testing 113
- Twisted Pair Cable 114
- LAN Cable Construction 115
- Coaxial Cable 116
- Attenuation 117
- Characteristic Impedance 119
- Locating NEXT Problems 121
- Split Pairs and NEXT 124
- Minimizing Crosstalk 125
- NVP and Length Measurements 126
- Reflections from Opens 128
- Reflections from Shorts 129
- Cable Termination 130
- Interpreting the TDR Plot 130
- Limit in dB 132
- Troubleshooting Basics 133
- Finding Cable Faults 133
- Cleaning and Storage 139
- Maintenance 141
- Service Center Repair 142
- If the Test Tool Fails 143
- Replacement Parts 144
- Specifications 145
- Cable Types Tested 146
- Test Standards 146
- Time for Autotest 146
- Length Test 147
- Propagation Delay Test 147
- DC Loop Resistance 148
- Return Loss 149
- Impulse Noise 150
- Model DSP-100 LAN Traffic 150
- Model DSP-2000 LAN Traffic 150
- Serial Interface 150
- PC Interface Cable 151
- Environmental Requirements 152
- Input Ratings 153
- Certifications 154
- Dimensions 154
- RJ45 Connector 155
- Warranty 155
- Appendices 157
- Using DSP-LINK 159
- Connecting to a PC 160
- Configuring the Serial Ports 161
- Downloading New Software 168
- 100BaseTX 169
- Glossary 171
- XON/XOFF Flow Control 177
- Appendix C 179
- (continued) 187
- Manual Supplement 191
- Return Loss (RL) 192
- Change #2 193
- Change #3 196
- Change #4 196
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