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3Com 5108M-TP manual 1. Sample Configuration Distance Calculation

Models: 5108M-TP

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Figure 2-1. Sample Configuration Distance Calculation

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Figure 2-1. Sample Configuration Distance Calculation

Use the following steps to determine whether your network configuration is legal:

1.Begin with 4.2 km (4200 m) since this is the maximum network diameter for a pure fiber network (Rule 3).

2.Subtract 100 m for the signal exiting the Fiber Modules in concentrators A and C (2 * 50) and 280 m for the signal entering the Fiber Modules in concentrators C and B (2 * 140) as explained in Rule 4 and defined in Table 2-2.

3.Subtract 420 m of fiber equivalent distance for the signal entering the 10BASE-T Module in concentrator A and 165 m for the signal exiting the 10BASE-T Module in concentrator B (Rule 4).

4.Subtract all cable lengths between the two transceivers and if the result is greater than zero, the configuration is within legal Ethernet limits (Rule 5).

Designing and Expanding the Network 2 - 9

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3Com 5108M-TP manual 1. Sample Configuration Distance Calculation

Contents

Document Number Printed March Model Number 5108M-TP 3Com Corporation ONline Ethernet 10BASE-T Module User’s Guide118 Turnpike Road Southborough, MA U.S.A 508 FAX 508 Canadian Emissions Requirements Federal Communications Commission NoticeVDE Class B Compliance EN55022/CISPR22 ComplianceRestricted Rights ONline Ethernet 10BASE-T Module User’s Guideiv ONline Ethernet 10BASE-T Module User’s Guide How to Use This Guide ContentsChapter 1 - Introduction Chapter 2 - Designing and Expanding the NetworkChapter 4 - Troubleshooting Chapter 3 - Installing and Operating the ModuleAppendix A - Specifications Appendix B - Technical SupportFigures viii ONline Ethernet 10BASE-T Module User’s Guide Tables Page Audience How to Use This GuideStructure of This Guide Convention Document ConventionsIndicates ExampleA Caution. A Related DocumentsA Warning. A Warning Wear eyeReference Documents 3Com DocumentsPage The ONline Ethernet 10BASE-T Module 1 IntroductionIndicators Introduction 1 Figure 1-1. 10BASE-T Module Faceplate and ONline System ConcentratorLED Name Dip SwitchesColor StateFigure 1-2. 10BASE-T Module and Dip Switch Locations Dip Switch SW1 Port StatusSwitch Dip Switch SW3 Crossover Mode, Channel Select, SquelchSwitch Setting DefaultSquelch Mode Switch Crossover Mode SwitchSwitch Switch Setting1 - 8 ONline Ethernet 10BASE-T Module User’s Guide Channel Select Switch SettingsChannel Selection Dip Switch SW6 Link IntegritySwitch SwitchLED and Channel Verification Related FeaturesSwitch Switch SettingThe ONline Ethernet Network Management Module Channel ConfigurationLED State Table 1-6. Channel Check Codes1 - 12 ONline Ethernet 10BASE-T Module User’s Guide Designing and Expanding the Network 2 2 Designing and ExpandingtheNetworkBasic Network Rules Understanding the General RulesDefinition RuleRecommendations/Notes Table 2-1. Seven Basic Network RulesRule Table 2-1. Seven Basic Network Rules ContinuedDefinition Recommendations/NotesDefinition RuleRecommendations/Notes The fiber link distancesLAN Product LAN EquivalenceEquivalent Distance metersTable 2-2. LAN Product Equivalent Distances Continued Fiber Backbone, Twisted Pair To-The-DeskLAN Product EquivalentFiber Backbone, Twisted Pair To-The-Desk Example Figure 2-1. Sample Configuration Distance Calculation Supports Link Distances Up To Cable Gauge22 .6mm 150mFigure 2-2. Unshielded Twisted Pair Network Twisted Pair Backbone, Twisted Pair To-The-DeskFigure 2-3. Redundant Twisted Pair Configuration Redundant LinksTo set redundancy between two 10BASE-T Modules, connect two links between the modules. The redundant link must be connected to a port on the same 10BASE-T Module as the primary link. Use a crossover adapter between each link unless you choose to uncross port 8 on one of the modules to make the connection. Refer to Chapter 1 for information on using crossover mode. Then use the SET PORT slot.port MODE REDUNDANT slot.port command to specify which port is the primary link and which is the backup link 2 - 14 ONline Ethernet 10BASE-T Module User’s Guide Patch PanelsPrecautionary Procedures 3 Installing and Operating the ModuleInstallation Procedures Unpacking ProceduresFigure 3-1. Installing a 10BASE-T Module Figure 3-2. 10BASE-T Module Cable Connection Troubleshooting 4 TroubleshootingTroubleshooting Troubleshooting With the Status LEDsProblem IndicationProblem TroubleshootingLED State IndicationProblem TroubleshootingLED State IndicationPossible Problem Troubleshooting With the Activity LEDsSolutions TroubleshootingTechnical Assistance ONline Ethernet 10BASE-T Module Specifications A SpecificationsElectrical Specifications Mechanical Specifications Environmental SpecificationsGeneral Specifications Twisted Pair Connectors Twisted Pair Connectors and CablesFigure A-1. RJ45 Connector Pin-outs Twisted Pair CablesConnecting Twisted Pair Cables Page On-line Technical Support B 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 Numerics Index