3Com 8800 manual ENGINEERING, Maintenance and Troubleshooting

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22CHAPTER 5: ENGINEERING, MAINTENANCE AND TROUBLESHOOTING

Table 6 Troubleshooting Guide

Controller alarm	Power supply
Controller alarm	module
status	display	Possible problems	Possible solution

ALM or None	--	Controller failure	Replace the
			controller

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Contents 3Com Switch Power Over Ethernet 3Com Corporation Campus Drive Marlborough, MA USA United States Government LegendContents Contents Introduction PoE Power Rack Rear View Architecture and Configurations Introduction System Description Power SupplyPoE Power Rack OverviewSystem Controller Power Supply ModuleVisual indicators Descriptions, colors, and functions are shown in TableRS485 and RS232 signals are described in and Table Pin DefinitionDistribution Panel Refer to FigureSafety Statements SafetySafety Symbols Safety Guidelines Installation and TestingIntroduction EMI ConsiderationsModule Technical Specifications Number Model Ports Type Disconnect DetectionRemoving Power Supply Module and Dummy Faceplate Frame Grounding Powering on the Device Installation and Testing Troubleshooting ENGINEERING, Maintenance TroubleshootingMaintenance LED IndicationENGINEERING, Maintenance and Troubleshooting