Example Sample Configuration Distance Calculation | 3Com 5124M-TP

Example: Sample Configuration Distance Calculation

Use the following example to determine if the 10BASE-T transceivers in Figure 2-3 are within legal Ethernet limits. Identify the two transceivers that are likely to be the greatest fiber equivalent distance apart. In Figure 2-3, they are 10BASE-T transceivers A and B.

Figure 2-3 shows 24-Port Modules installed in each of three concentrators.

Figure 2-3. Sample Configuration Distance Calculation Using 24-Port Modules

To determine if your network configuration is legal:

1.Use 4200 m as the maximum network diameter for a pure fiber network as defined by the 802.3 specification.

Designing and Expanding the Network 2 - 11

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3Com 5124M-TPCL manual Example Sample Configuration Distance Calculation

Contents

ONline Ethernet 24-Port 10BASE-T Module Installation Guide VDE Class B Compliance Restricted Rights Page Contents Installing and Operating the Module Troubleshooting Page Figures ONline Ethernet 24-Port 10BASE-T Module Installation Guide Tables Page Audience How to Use This Guide Structure of This Guide Usr/snm/agents Document ConventionsConvention Indicates Example Related Documents Reference Documents 3Com DocumentsPage Ethernet 24-Port 10BASE-T Module Description Introduction Module Features Bank Switching Capability Model Number 5124M-TPCL Features Theory of Operation Model Number 5124M-TP Features Typical 24-Port Module Configuration Page Designing and Expanding the Network Understanding the General Rules Rules for Configuring a Network Rule Definition Recommendations/Notes Seven Basic Network Rules Certain LAN devices Seven Basic Network Rules LAN Product Equivalent Distance meters LAN EquivalenceLAN Product Equivalent Distances LAN Product Equivalent Choosing a Network Backbone Cabling Structure Star-Wiring Configuration Building a Network Star Configuration Serial Configuration Building a Network Serial Configuration Fiber Backbone, 10BASE-T To-The-Desk Port Module Configurations Example Sample Configuration Distance Calculation 10BASE-T Backbone, 10BASE-T To-The-Desk Unshielded Twisted Pair Network Using 24-Port Modules Establishing Fault-Tolerant Configurations Using Patch Panels Setting Backbone Redundancy Setting Port Redundancy Redundant Twisted Pair Backbone Designing and Expanding the Network 2 Page Installing and Operating the Module Step Procedure Section Title Precautionary ProceduresQuick Installation Procedures for Completing Installation Establish connections from the 24-Port Setting the DIP Switches Unpacking Procedures DIP Switch Overview Model 5124M-TPCL and Model 5124M-TP DIP Switch Location DIP Switch Description Default DIP Switch SettingsLabel Function Factory DIP Switch Setting Network Selection Channel Network Select DIP Switch SettingsDIP Switch Setting Conn Installing the Module Installing a 24-Port Module Model Number 5124M-TPCL Port Module Cable Connection Model Number 5124M-TPCL Installing the Cable Tie-Wrap Kit Using 90 Cable Connectors Attaching the Tie-Wrap Bracket to the Module Securing 90 Cables to the Module Attaching Cables With 90 Connectors Configuration in a Managed Environment If Management is Not Available Enabling Port Redundancy Before Configuring the ModuleEnabling Ports Selecting a Network Enabling Link Integrity Enabling Remote Diagnostics Mode Setting the Autopartition Threshold Value Showing Module Configurations Saving Module Configurations Show Module Show Port Telco Gathering Network Statistics Selecting the Per-Port Counters Connector Shows the location of the LEDs on Model Number 5124M-TPCL Monitoring the Front Panel Shows the location of the LEDs on Model Number 5124M-TP LED Name Color State Indicates Port Module LED Interpretations Verifying LED and Network Assignments Using the LED Check Button Network Check Codes LED State Network ConfigurationPage Troubleshooting LED State Indication Possible Cause Corrective Action Troubleshooting Using the Port Status LEDsTroubleshooting Using the Port Status LEDs Troubleshooting Using the Port Status LEDs LED State Possible Cause Corrective Action Troubleshooting Using the Port Activity LEDsTroubleshooting Using the Port Activity LEDs Technical Assistance Specifications Model Number 5124M-TP General SpecificationsTable A-1 -Port Module General Specifications Specification Value Power Specifications Values Power SpecificationsTable A-2 -Port Module Power Specifications Table A-4 -Port Module Environmental Specifications Environmental SpecificationsTable A-3 -Port Module Fuse Specifications Fuse Specifications for 24-Port Module Mechanical 5124M-TPCL Values 5124M-TP Values Specifications Mechanical SpecificationsTwisted Pair Cable and Connector Specifications Table A-5 -Port Module Mechanical Specifications Shielding Nominal Pairs Impedance Twisted Pair Cable SpecificationsTable A-6. IBM Twisted Pair Cable Specifications IBM Type No. RJ-45 Connector Pinouts Twisted Pair Connector Specifications Figure A-1 -Port Module RJ-45 Connector Pinouts Pin Connector Pinouts Figure A-2 -Pin Male and Female Connectors Table A-7 -Pin Cable Pinouts and Port Assignments Port TX, + RX, + Not Used Connecting Twisted Pair Cables On-line Technical Support Technical Support World Wide Web Site Support from Your Network SupplierEmail Technical Support Support from 3Com Returning Products for Repair Accessing the 3Com MIB 3Com Technical Publications Page Index Activity LEDs, 3-29,3-31 VDE compliance