MRV Communications MR2228-S2C manual Power Supply Receptacles, System Status LEDs

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Table 1-2. System Status LEDs

LED	Condition	Status
PWR	On Green	The unit’s internal power supply is operating
		normally.
	On Amber	The unit’s internal power supply has failed.
	Off	The unit has no power connected.
Diag	On Green	The system diagnostic test has completed
		successfully.
	Flashing	The system diagnostic test is in progress.
	Green
	On Amber	The system diagnostic test has detected a fault.
RPU	Green	A redundant power unit is attached and is in backup
		or active mode.
	Amber	There is a fault in the redundant power unit.
	Off	There is no redundant power unit currently
		attached.
Stack	Flashing	An initial power-on state during which the stack
	Amber	configuration is detected.
	Green	This switch is acting as the Master unit in the stack.
	Amber	This switch is acting as a Slave unit in the stack.
	Flashing	When the user enters the light unit command in
	Green	the CLI, the unit ID of each switch in the stack will
		be displayed by the port LEDs 1 to 8.

Power Supply Receptacles

There are two power receptacles on the rear panel of the switch. The standard

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Contents Stackable Fast Ethernet Switch Installation Guide Installation Guide Contents Appendix B Cables Switch Architecture IntroductionOverview Network Management Options Description of Hardware10BASE-T/100BASE-TX Ports 1000BASE-T/SFP PortsPort and System Status LEDs Stacking PortsCondition Status Port Status LEDsSystem Status LEDs Power Supply ReceptaclesConnectivity Features and BenefitsExpandability PerformanceManagement Network Planning Introduction to SwitchingApplication Examples Collapsed BackboneCollapsed Backbone Network Aggregation PlanNetwork Aggregation Plan Remote Connections with Fiber CableRemote Connections with Fiber Cable Making Vlan ConnectionsMaking Vlan Connections Application NotesInstalling the Switch Selecting a SiteEthernet Cabling Package Contents Equipment ChecklistMounting Optional Rack-Mounting EquipmentAttaching the Brackets Rack MountingAttaching the Adhesive Feet Desktop or Shelf MountingConnecting Switches in a Stack Installing an Optional SFP TransceiverConnecting Switches in a Ring-topology Stack Connecting to a Power SourceWiring Map for Serial Cable Connecting to the Console PortDTE Port Connecting to PCs, Servers, Hubs and Switches Connecting Network DevicesMaking Network Connections Twisted-Pair DevicesMaking Twisted-Pair Connections Network Wiring ConnectionsFiber Optic SFP Devices Network Wiring Connections1000BASE-T Cable Requirements Connectivity RulesMbps Gigabit Ethernet Collision Domain Cable Labeling and Connection RecordsMbps Fast Ethernet Collision Domain Mbps Ethernet Collision DomainPage Diagnosing Switch Indicators Appendix a TroubleshootingPower and Cooling Problems Table A-1. Troubleshooting Chart Symptom ActionInstallation In-Band AccessStack Troubleshooting Appendix B Cables Twisted-Pair Cable and Pin Assignments10BASE-T/100BASE-TX Pin Assignments Crossover Wiring Straight-Through Wiring1000BASE-T Pin Assignments Cable Testing for Existing Category 5 Cable Adjusting Existing Category 5 Cabling to Run 1000BASE-TFiber Standards Appendix C Specifications Management Features In-Band Management Forwarding ModeSafety ThroughputAuto-Negotiation 1000BASE-TBandwidth CollisionRJ-45 Connector Media Access Control MACSwitched Ports Ieee 802.3ab