3Com 5124M-TPCL manual Unshielded Twisted Pair Network Using 24-Port Modules

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Figure 2-4. Unshielded Twisted Pair Network Using 24-Port Modules

The equivalent fiber distance can be calculated as follows:

Total link distance: 100 m + 100 m + 100 m + 50 m + 20 m = 370 m

Total equivalent distance of the 24-Port Modules:

4 * 420 m + 4 * 165 m = 2340 m

(signal externally enters 4 Twisted Pair Modules: 4 * 420 m)

(signal internally enters 4 Twisted Pair Modules from the backplane: 4 * 165 m)

Note: All 3Com 10BASE-T modules (8-Port 10BASE-T Module, 50-Pin 10BASE-T Module, or the 24-Port 10BASE-T Modules) fall under these same rules.

Total equivalent distance: 370 m + 2340 m = 2710 m

Because the total equivalent distance (2710 m) is less than 4200 meters, this configuration is legal.

Designing and Expanding the Network 2 - 13

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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 GuideStructure of This Guide Convention Indicates Example Document ConventionsUsr/snm/agents Related Documents Reference Documents 3Com DocumentsPage Ethernet 24-Port 10BASE-T Module Description IntroductionModule Features Bank Switching Capability Model Number 5124M-TPCL FeaturesTheory of Operation Model Number 5124M-TP FeaturesTypical 24-Port Module Configuration Page Designing and Expanding the Network Understanding the General Rules Rules for Configuring a NetworkRule Definition Recommendations/Notes Seven Basic Network RulesCertain LAN devices Seven Basic Network Rules LAN Product Equivalent Distances LAN EquivalenceLAN Product Equivalent Distance meters LAN Product Equivalent Choosing a Network Backbone Cabling StructureStar-Wiring Configuration Building a Network Star ConfigurationSerial Configuration Building a Network Serial ConfigurationFiber Backbone, 10BASE-T To-The-Desk Port Module ConfigurationsExample 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 PanelsSetting Backbone Redundancy Setting Port RedundancyRedundant Twisted Pair Backbone Designing and Expanding the Network 2 Page Installing and Operating the Module Quick Installation Precautionary ProceduresProcedures for Completing Installation Step Procedure Section TitleEstablish connections from the 24-Port Setting the DIP Switches Unpacking ProceduresDIP Switch Overview Model 5124M-TPCL and Model 5124M-TP DIP Switch Location DIP Switch Description Label Function Factory DIP Switch Setting DIP Switch SettingsDefault DIP Switch Setting Conn Channel Network Select DIP Switch SettingsNetwork Selection 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 ConnectorsAttaching 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 Ports Before Configuring the ModuleEnabling Port Redundancy Selecting a Network Enabling Link IntegrityEnabling Remote Diagnostics Mode Setting the Autopartition Threshold Value Showing Module Configurations Saving Module ConfigurationsShow 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 PanelShows the location of the LEDs on Model Number 5124M-TP LED Name Color State Indicates Port Module LED InterpretationsVerifying LED and Network Assignments Using the LED Check ButtonNetwork Check Codes LED State Network ConfigurationPage Troubleshooting Troubleshooting Using the Port Status LEDs Troubleshooting Using the Port Status LEDsLED State Indication Possible Cause Corrective Action Troubleshooting Using the Port Status LEDs Troubleshooting Using the Port Activity LEDs Troubleshooting Using the Port Activity LEDsTechnical Assistance LED State Possible Cause Corrective ActionSpecifications Table A-1 -Port Module General Specifications General SpecificationsSpecification Value Model Number 5124M-TPTable A-2 -Port Module Power Specifications Power SpecificationsPower Specifications Values Table A-3 -Port Module Fuse Specifications Environmental SpecificationsFuse Specifications for 24-Port Module Table A-4 -Port Module Environmental SpecificationsTwisted Pair Cable and Connector Specifications Mechanical SpecificationsTable A-5 -Port Module Mechanical Specifications Mechanical 5124M-TPCL Values 5124M-TP Values SpecificationsTable A-6. IBM Twisted Pair Cable Specifications Twisted Pair Cable SpecificationsIBM Type No. Shielding Nominal Pairs ImpedanceRJ-45 Connector Pinouts Twisted Pair Connector SpecificationsFigure A-1 -Port Module RJ-45 Connector Pinouts Pin Connector PinoutsFigure 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 SupportEmail Technical Support Support from Your Network SupplierWorld Wide Web Site Support from 3Com Returning Products for Repair Accessing the 3Com MIB3Com Technical Publications Page Index Activity LEDs, 3-29,3-31 VDE compliance