3Com 5017C-LS, 5017C with load sharing Backup Controller Module, Redundant Cable Links

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Backup Controller Module

The controller is vital to the system because it performs important functions including:

synchronizing all modules

monitoring concentrator conditions (temperature, power supply status, etc.)

recognizing failures

clocking and timing to the ONline Concentrator backplane

By using two 3Com Fault-Tolerant Controller Modules (5000M-RCLS) in your concentrator you can protect these critical tasks if a controller fails.

Note: You cannot use the 5000M-RCTL or 5000M-CTL controller in a load-sharing concentrator (Model 5017C-LS or Model 5017C with load-sharing upgrade).

Redundant Cable Links

Cable breaks or failures are the most common problem in any network. Using the ONline Ethernet Fiber Module in your ONline System Concentrator enables you to implement full cable redundancy for your network's backbone. Thereafter, if one port should fail, or if a cable is disconnected or cut, the backup port will take over in 100 milliseconds. A sample redundant network connection is shown in Figure 1-6.

Introduction 1 - 9

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Contents Document Number Printed March VDE Class B Compliance Restricted Rights Page Contents Maintenance Appendix B Slot Usage Chart Appendix C Technical Support Page Figures Page Tables Page Audience How to Use This GuideThis guide contains the following chapters Structure of This GuideConvention Indicates Example Document ConventionsRelated Documents Reference Documents 3Com DocumentsPage Introducing the ONline System Concentrator IntroductionMultiple 17-Slot Concentrator Environment Front Panel Back PanelONline System Concentrator Front View ONline System Concentrator FeaturesModular Design Modular ONline ConfigurationTriChannel Architecture Port-Switching TechnologyONline System Concentrator Using Multiple Networks Fault-Tolerance Capabilities Backup Power SupplyLoad Sharing Redundant Cable Links Backup Controller ModuleRedundant Cable Link Configuration Backup ConcentratorHot Swapping of Media Modules Backup Concentrator ConfigurationSynchronous Backplane Contents of the Shipping Box Installation and TroubleshootingONline System Concentrator Shipping Box Contents FCC Regulations Site Selection Considerations Location RequirementsVentilation Rack Mount Installation Requirements Power RequirementsTable Top Installation Requirements InstallationInstalling the Cable Tray Cable Tray Rack Mounting Rack Mount SettingsRack Mount Positions Cable Tray Table Mounting Cable Tray Installation in RackRack Mounting the ONline System Concentrator Installing the ONline System ConcentratorAttaching the Rack Mount Flanges Chassis Mounted in Rack Table Top Mounting the ONline ConcentratorRemoving Fan Unit Installing the Backup Power Supply OptionalUnplugging the Fan Unit Power Supply Connectors 10. Installed Backup Power Supply Selecting the Power Supply Voltage11. Setting the Voltage Selector Switch Connecting Network Cables Installing ONline Modules12. Network Cable Connections Power Up and VerificationFan Operation Verification Power Supply Operation VerificationTroubleshooting with Controller Module LEDs Command. If this fails to See Primary Power LED Technical Assistance Configuration of your concentrator Where To Go From HereMaintenance Replacing the Power Supply Routine MaintenanceRemoving the Power Supply Unplugging the Power Supply Power Supply Plugs in ONline System Concentrator Backup Power Supply Installed Removing the Fan Unit Replacing the Fan UnitUnplugging the Fan Unit Other System Components ONline Module MaintenancePage Environmental GeneralPower Source MechanicalRegulatory Compliance Accessories Page Slot Usage Chart Table B-1. Concentrator Slot Usage Chart Table B-1. Concentrator Slot Usage Chart Page On-line Technical Support Technical SupportSupport from Your Network Supplier Email Technical SupportWorld Wide Web Site Support from 3Com Returning Products for Repair Accessing the 3Com MIB3Com Technical Publications Page Index Index