Reversed Pair, RJ45, Runt Packet, Segment | Fluke DSP-100, DSP-2000

Glossary

Reversed Pair B

Reversed Pair

A wiring error in twisted pair cabling where the pins on a cable pair are reversed between connectors on each end of the cable.

RJ45

An 8-pin modular connector used with twisted pair cable. The RJ45 connector resembles a telephone connector (RJ11).

ROM

Read-only memory. A device used for permanent storage of data or programs. A ROM does not require power to maintain its contents. Once a ROM is programmed, its contents cannot be altered.

Runt Packet

An Ethernet data packet that is shorter than the valid minimum packet length of 64 bytes. Runt packets are usually caused by a collision.

Screened Twisted Pair (ScTP)

Twisted pair cable wrapped in a metallic sheath. The sheath, which is grounded at a single location in the network, acts as a shield that protects the cable pairs from crosstalk and other sources of electrical noise.

Serial Data Transmission

The transmission of data over a single wire.

Segment

A network cable terminated at both ends.

Shielded Twisted Pair

Refers to shielded twisted pair IBMâ cable with an impedance of 150W.

Skin Effect

The tendency of current to flow only near the surface of a conductor. This effect becomes more pronounced at higher frequencies.

B-7

Image 175

Fluke DSP-100 Reversed Pair, RJ45, Runt Packet, Screened Twisted Pair ScTP, Serial Data Transmission, Segment, Skin Effect

Contents

DSP-100/2000 Limited Warranty & Limitation of Liability Table of Contents DSP-100/2000 Appendices DSP-100/2000 List of Tables Tests Run per Test Standard During an Autotest List of Figures Plot of NEXT, Attenuation, and the Resulting ACR Introduction Overview of Features DSP-100/2000 Standard Accessories Standard Accessories Using This Manual DSP-100/2000 International Electrical Symbols Safety and Operational Information DSP-100/2000 Key Powering the Test ToolUsing the Menus Quick Start Setup Setting Quick ConfigurationQuick Configuration Settings Description Press ! Choice Asterisk and Test Tool Accuracy Results within Accuracy Range Autotest on Twisted Pair Cable Horizontal Cross Connect Blocks Meters Getting Started Autotest on Coaxial Cable Autotest on Coaxial Cable DSP-100 DSP-2000 Main Unit Features Main Unit Features Description Feature Standard and Smart Remote Features Remote Features Remote Connectors and Features Remote Features Strap and Bail Rotary SwitchOff Autotest Monitor Single Test Setup Smart Remote Model DSP-100 Turning On the Test ToolPrint Special Functions Performing a Self-Test Selecting a Language for Displays and Reports Controlling the Backlight Configuring the Test ToolOvervoltage Test Noise Test Selecting a Power Line Filter Frequency Adjusting the Display Contrast Selecting a Test Standard and Cable Type Selecting an Average Cable Temperature Selecting a Conduit Setting Selecting a Numeric Format Selecting a Length Unit Setting the Date and Time Enabling or Disabling the Audible Tones Setting the Power-Down Timer Remote Lights, Messages, and Audible Tones Smart Remote Ready Remote End Testing Battery Status Remote Communication Error Battery Status Display Autotest Softkeys Autotest Smart Autotest Link Performance Grade Result Headroom Automatic Diagnostics Model DSP-2000 Automatic Diagnostics Model DSP-2000 Autotest Results for Twisted Pair Cable Wire Map Test Autotest Results for Twisted Pair Cable Length Resistance Characteristic Impedance Propagation Delay and Delay Skew Items on the Attenuation Results Screen Description Attenuation Gc10c.eps Items on the Next Results Screen Description Next Test Next Plot Screen Items on the Next Plot Screen Description ACR Items on the ACR Results Screen Description ACR Plot Screen Items on the ACR Plot Screen Description Items on the RL Results Screen Description Return Loss RL RL@REMOTE Model DSP-2000 Psnext Power Sum Next Model DSP-2000 Connector Autotest Results for Coaxial Cable No Reflection Anomaly Saving Autotest Results Gc15c.eps Automatically Incrementing the Cable Identification Name Autotest ReportIf Memory is Full Part of an Autotest Report for Twisted Pair 10. Autotest Report for Coaxial Cable DSP-100/2000 Single Tests for Twisted Pair Cable Running Individual Tests Scanning Function When to Use a Remote Unit Remote Requirements for Cable Tests Remote Unit Test Running a Single Test on Twisted Pair Cable Running Individual Tests Running the TDX Analyzer TDX Analyzer Items on the TDX Analyzer Results Screen TDX Analyzer Results TDX Analyzer Plot TDR Test How to Terminate the Cable Running the TDR Test on Coaxial Cable Running the TDR Test on Twisted Pair Cable TDR Plot Screen TDR Results ScreenItems on a TDR Results Screen Twisted Pair Results Single Test Results for Twisted Pair Cable Next and NEXT@REMOTE Wire MapImpedance Return Loss RL and RL@REMOTE Single Tests for Coaxial CableRunning a Single Test on Coaxial Cable Single Tests for Coaxial Cable Single Test Results for Coaxial Cable Monitoring Network Activity Monitoring Network Activity DSP-100/2000 Items on the Traffic Monitor Screen Description Monitoring Impulse Noise Identifying Hub Port ConnectionsChanging the Impulse Noise Threshold Running the Impulse Noise Test Use Dto highlight Impulse Noise on RJ45 Noise Test Results Determining Hub Port Capabilities Model DSP-2000Items on the Noise Monitor Screen Description Using the Tone Generator Model DSP-2000 Printing Test Reports Viewing and Printing Saved Reports Printer Interface Cable Configuring the Serial PortPrinting Viewing and Printing Saved Reports Printing Test Reports DSP-100/2000 If the Printer Does Not Respond Viewing, Renaming, and Deleting Test Reports Calibrating the Test Tool Calibrations and Custom Test Standards Connections for Self-Calibration DSP-2000 Shown Use Dto highlight Determine Cable NVP NVP Calibration Configuring a Custom Cable Page DSP-100/2000 LAN Cable Construction Basic Cable Testing Twisted Pair Cable Construction Twisted Pair Cable 568A Coaxial Cable Construction Coaxial Cable Attenuation Attenuation of a Signal Sources of Electrical Noise Noise Characteristic Impedance Minimizing Impedance Discontinuities Crosstalk and Near-End Crosstalk Next Locating Next Problems A TDX Analyzer Plot Basic Cable Testing Split Pairs and Next Incorrect Wiring Split Pair Minimizing Crosstalk NVP and Length Measurements Nominal Velocity of Propagation NVP NVP Calibration Time Domain Reflectometry TDR Short Reflections from Opens Reflections from Other Discontinuities Reflections from Shorts Interpreting the TDR Plot Cable Termination ACR Frequency in MHz Limit in dB Finding Cable Faults Troubleshooting Basics Test Failure Identifying Cable Faults Likely Causes of Failure Identifying Cable Faults Examples of Test Displays and Plots Identifying Cable Faults Test Failure Next test fails Impedance anomaly is Detected DSP-100/2000 Cleaning and Storage Maintenance Removing the Battery in the Standard Remote Replacing the NiCad Battery Pack Removing the NiCad Battery Pack Internal Lithium Backup Battery If the Test Tool Fails Service Center Repair Symptom 6 Self calibration fails Troubleshooting the Test Tool Symptom 1 Display is blankSymptom 2 Remote unit is not detected Symptom 3 Test results appear to be incorrect Replacement Parts Description Replacement PartsPart Number Compatibility with Remote Units SpecificationsService Center Calibration Period Self-Calibration Period Test Standards Cable Types TestedTime for Autotest Length Test Propagation Delay TestLength Test Specifications Propagation Delay Test Specifications Next DC Loop Resistance TDR Specifications for Cables 100m 328 ft TDX Analyzer Specifications for Cables 100m 328 ftReturn Loss Serial Interface Impulse NoiseModel DSP-100 LAN Traffic Model DSP-2000 LAN Traffic PC Interface Cable 25-pin ConnectorPC Interface Cable Connections Test Tool End DB9S female Environmental Requirements Power Input Ratings Operating Environment Specifications Memory DimensionsWeight Certifications Warranty RJ45 ConnectorDisplay DSP-100/2000 Appendices Page Introduction Using DSP-LINK Connecting to a PC Installing DSP-LINKPreparing for Data Transfer Figure A-1. Connecting the Test Tool to a PC Configuring the Serial Ports Communication Problems Detailed Test Data Quick Plot DSP-LINK Functions DSP-100/2000 Table A-3. Formats for Uploaded Reports Courier Point Size Formatting Hints for Uploaded Reports Getting Software Updates from Fluke Downloading New Test Standards Downloading New Software 10BaseT 10Base2100BaseTX Bandwidth Baseband SignalingBroadband Signaling Auto-Negotiation Crossed Pair CapacitanceChannel Collision EIA 568A CrosstalkCSV Data Download Impedance Discontinuity Hardware Flow ControlHorizontal Cabling Horizontal Cross-Connect Packet Propagation DelayLink Pulse Near-End Crosstalk Next Screened Twisted Pair ScTP Reversed PairRJ45 Runt Packet Token Ring Split PairTDXä Terminator XON/XOFF Flow Control DSP-100/2000 Tests Run per Test Standard During an Autotest Next Tests Run per Test Standard During an Autotest C Prop. Return Loss Delay2 Delay Skew2 TP-PMD Return Loss Prop Delay2 Delay Skew2 DSP-100/2000 Index DSP-LINK Next DSP-100/2000 Index DSP-100/2000 Manual Supplement Change #1 Wire Map Displays Displayed Schematic Description Wire Map Condition Wire map display showing an open on pair 1 Wire map display showing a split pair on pairs 1, 2 and 3 Change #3