3Com 5017C with load sharing, 5017C-LS Power Requirements, Rack Mount Installation Requirements

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Caution: The concentrator should have two fans running at all times to cool the unit properly. You should therefore have: (A) a power supply (with built-in fan) and a fan unit installed or (B) two power supplies installed.

Power Requirements

3Com recommends using a 15 ampere electrical wire (branch circuit) to supply power to the concentrator. This circuit must be grounded to a safety ground (protected earth ground), not to neutral that carries current back to the transformer. Do not use the electrical conduit pipe as the only means of grounding.

Rack Mount Installation Requirements

For rack mount installation of the ONline System Concentrator you need a standard nineteen-inch EIA configured rack. The rack and its environment also should meet the following specifications:

If the rack has an open back and sides:

the rack must be bolted to the floor

the top of the rack may need to be braced to the wall

the rack must be grounded

there must be 10.5" (26.7 cm) (6U) of vertical space in the rack for each 17-slot concentrator

the unit location in the rack must be less than 6 feet (2 meters) from the nearest AC outlet

patch panels should already be installed in the rack for easier cable management

Installation and Troubleshooting 2 - 5

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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 Load Sharing Fault-Tolerance CapabilitiesBackup Power Supply 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 Ventilation Site Selection ConsiderationsLocation Requirements 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 GeneralRegulatory Compliance Power SourceMechanical 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 SupportWorld Wide Web Site Support from Your Network SupplierEmail Technical Support Support from 3Com Returning Products for Repair Accessing the 3Com MIB3Com Technical Publications Page Index Index