3Com 5124M-TPCL manual Setting the Autopartition Threshold Value

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Setting the Autopartition Threshold Value

To set the maximum number of data collisions an installed management module allows on a port before it partitions the port, use the following management command:

SET MODULE {slot} AUTOPARTITION_THRESHOLD {31_coll} {63_coll} {127_coll} {255_coll}

You can set the autopartition threshold value to one of the following:

❑31

❑63 (default value)

❑127

❑255

The proper setting for most network environments is 63 (the default). The 10BASE-T specification suggests a minimum autopartition threshold value of 31, but 31 collisions may cause ports to partition more frequently than necessary.

Note: Autopartition values 127 and 255 are suggested only for debugging purposes, and are not recommended for use in live networks.

3 - 22 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 Precautionary Procedures Quick InstallationProcedures for Completing 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 Troubleshooting Using the Port Activity LEDs Troubleshooting Using the Port Activity LEDsTechnical Assistance LED State Possible Cause Corrective ActionSpecifications General Specifications Table A-1 -Port Module General SpecificationsSpecification Value Model Number 5124M-TPTable A-2 -Port Module Power Specifications Power SpecificationsPower Specifications Values Environmental Specifications Table A-3 -Port Module Fuse SpecificationsFuse Specifications for 24-Port Module Table A-4 -Port Module Environmental SpecificationsMechanical Specifications Twisted Pair Cable and Connector SpecificationsTable A-5 -Port Module Mechanical Specifications Mechanical 5124M-TPCL Values 5124M-TP Values SpecificationsTwisted Pair Cable Specifications Table A-6. IBM Twisted Pair Cable SpecificationsIBM Type No. 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