3Com 5017C with load sharing Installing the Backup Power Supply Optional, Removing Fan Unit

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Installing the Backup Power Supply (Optional)

Install the backup power supply in the ONline System Concentrator (if ordered). This power supply provides power redundancy if the primary power supply should fail. Skip this section if you do not have a backup power supply.

To install the backup power supply, you must first remove the fan unit from the power supply slot in the back of the unit. Follow the steps below to install the backup power supply:

1.Remove and save the four screws that attach the fan unit to the rear of the concentrator as shown in Figure 2-6.

Figure 2-6. Removing Fan Unit

2.Carefully remove the fan unit and disconnect the fan unit wiring harness from the connector inside the base of the ONline unit as shown in Figure 2-7. Save this fan unit in case a power supply should fail at a later time and you need to reinstall the fan unit.

2 - 14 ONline 17-Slot System Concentrator Installation and Operation Guide

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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 How to Use This Guide AudienceStructure of This Guide This guide contains the following chaptersDocument Conventions Convention Indicates ExampleRelated Documents 3Com Documents Reference DocumentsPage Introduction Introducing the ONline System ConcentratorMultiple 17-Slot Concentrator Environment Back Panel Front PanelONline System Concentrator Features ONline System Concentrator Front ViewModular ONline Configuration Modular DesignPort-Switching Technology TriChannel ArchitectureONline System Concentrator Using Multiple Networks Load Sharing Fault-Tolerance CapabilitiesBackup Power Supply Backup Controller Module Redundant Cable LinksBackup Concentrator Redundant Cable Link ConfigurationBackup Concentrator Configuration Hot Swapping of Media ModulesSynchronous Backplane Installation and Troubleshooting Contents of the Shipping BoxONline System Concentrator Shipping Box Contents FCC Regulations Ventilation Site Selection ConsiderationsLocation Requirements Power Requirements Rack Mount Installation RequirementsInstallation Table Top Installation RequirementsInstalling the Cable Tray Rack Mount Settings Cable Tray Rack MountingRack Mount Positions Cable Tray Installation in Rack Cable Tray Table MountingInstalling the ONline System Concentrator Rack Mounting the ONline System ConcentratorAttaching the Rack Mount Flanges Table Top Mounting the ONline Concentrator Chassis Mounted in RackInstalling the Backup Power Supply Optional Removing Fan UnitUnplugging the Fan Unit Power Supply Connectors Selecting the Power Supply Voltage 10. Installed Backup Power Supply11. Setting the Voltage Selector Switch Installing ONline Modules Connecting Network CablesPower Up and Verification 12. Network Cable ConnectionsPower Supply Operation Verification Fan Operation VerificationTroubleshooting with Controller Module LEDs Command. If this fails to See Primary Power LED Technical Assistance Where To Go From Here Configuration of your concentratorMaintenance Routine Maintenance Replacing the Power SupplyRemoving the Power Supply Unplugging the Power Supply Power Supply Plugs in ONline System Concentrator Backup Power Supply Installed Replacing the Fan Unit Removing the Fan UnitUnplugging the Fan Unit ONline Module Maintenance Other System ComponentsPage General EnvironmentalRegulatory Compliance Power SourceMechanical Accessories Page Slot Usage Chart Table B-1. Concentrator Slot Usage Chart Table B-1. Concentrator Slot Usage Chart Page Technical Support On-line Technical SupportWorld Wide Web Site Support from Your Network SupplierEmail Technical Support Support from 3Com Accessing the 3Com MIB Returning Products for Repair3Com Technical Publications Page Index Index