3Com 5124M-TPCL manual Theory of Operation, Model Number 5124M-TP Features

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Model Number 5124M-TP Features

Model Number 5124M-TP permits you to connect individual 10BASE-T-compliant ports using 24 RJ-45 connectors (one connector per port). The RJ-45 connectors provide direct connections to 10BASE-T cables (one cable per connected port).

Theory of Operation

ONline Ethernet 24-Port 10BASE-T Modules incorporate repeaters and twisted pair transceivers that receive and restore amplitude to incoming signals. 24-Port Module repeaters restore phase and frequency.

Repeated signals:

❑Synchronize to the system clock

❑Enter on the TriChannel® backplane of the ONline System Concentrator.

Outgoing signals from the TriChannel backplane are:

❑Sent directly to transceivers

❑Transmitted to twisted pair link segments by the transceivers

1 - 4 ONline Ethernet 24-Port 10BASE-T Module Installation Guide

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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 How to Use This Guide AudienceStructure of This Guide Convention Indicates Example Document ConventionsUsr/snm/agents Related Documents 3Com Documents Reference DocumentsPage Introduction Ethernet 24-Port 10BASE-T Module DescriptionModule Features Model Number 5124M-TPCL Features Bank Switching CapabilityModel Number 5124M-TP Features Theory of OperationTypical 24-Port Module Configuration Page Designing and Expanding the Network Rules for Configuring a Network Understanding the General RulesSeven Basic Network Rules Rule Definition Recommendations/NotesCertain LAN devices Seven Basic Network Rules LAN Product Equivalent Distances LAN EquivalenceLAN Product Equivalent Distance meters Choosing a Network Backbone Cabling Structure LAN Product EquivalentBuilding a Network Star Configuration Star-Wiring ConfigurationBuilding a Network Serial Configuration Serial ConfigurationPort Module Configurations Fiber Backbone, 10BASE-T To-The-DeskExample Sample Configuration Distance Calculation 10BASE-T Backbone, 10BASE-T To-The-Desk Unshielded Twisted Pair Network Using 24-Port Modules Using Patch Panels Establishing Fault-Tolerant ConfigurationsSetting Port Redundancy Setting Backbone RedundancyRedundant Twisted Pair Backbone Designing and Expanding the Network 2 Page Installing and Operating the Module Procedures for Completing Installation Precautionary ProceduresQuick Installation Step Procedure Section TitleEstablish connections from the 24-Port Unpacking Procedures Setting the DIP SwitchesDIP 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 Using 90 Cable Connectors Installing the Cable Tie-Wrap KitAttaching 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 Enabling Link Integrity Selecting a NetworkEnabling Remote Diagnostics Mode Setting the Autopartition Threshold Value Saving Module Configurations Showing Module ConfigurationsShow Module Show Port Telco Gathering Network Statistics Selecting the Per-Port Counters Connector Monitoring the Front Panel Shows the location of the LEDs on Model Number 5124M-TPCLShows the location of the LEDs on Model Number 5124M-TP Port Module LED Interpretations LED Name Color State IndicatesUsing the LED Check Button Verifying LED and Network AssignmentsLED State Network Configuration Network Check CodesPage 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 Technical Assistance Troubleshooting Using the Port Activity LEDsTroubleshooting Using the Port Activity LEDs LED State Possible Cause Corrective ActionSpecifications Specification Value General SpecificationsTable A-1 -Port Module General Specifications Model Number 5124M-TPTable A-2 -Port Module Power Specifications Power SpecificationsPower Specifications Values Fuse Specifications for 24-Port Module Environmental SpecificationsTable A-3 -Port Module Fuse Specifications Table A-4 -Port Module Environmental SpecificationsTable A-5 -Port Module Mechanical Specifications Mechanical SpecificationsTwisted Pair Cable and Connector Specifications Mechanical 5124M-TPCL Values 5124M-TP Values SpecificationsIBM Type No. Twisted Pair Cable SpecificationsTable A-6. IBM Twisted Pair Cable Specifications Shielding Nominal Pairs ImpedanceTwisted Pair Connector Specifications RJ-45 Connector PinoutsPin Connector Pinouts Figure A-1 -Port Module RJ-45 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 Technical Support On-line Technical SupportEmail Technical Support Support from Your Network SupplierWorld Wide Web Site Support from 3Com Accessing the 3Com MIB Returning Products for Repair3Com Technical Publications Page Index Activity LEDs, 3-29,3-31 VDE compliance