3Com 3C16491 manual Supplying Power to the Switch, Checking for Correct Operation

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18INSTALLING THE SWITCH

If you are placing Switch units one on top of the other, you must use the self-adhesive rubber pads supplied. Apply the pads to the underside of each Switch, sticking one in the marked area at each corner.

Place the Switch units on top of each other, ensuring that the pads of the upper unit line up with the recesses of the lower unit.

Supplying Power to the Switch

Power problems can be the cause of serious failures and downtime in your network. Ensure that the power input to your system is clean and free from sags and surges to avoid unforeseen network outages. 3Com recommends that you install power conditioning, especially in areas prone to blackout, power dips and electrical storms.

The unit is intended to be grounded. Ensure it is connected to earth ground during normal use. Installing proper grounding helps to avoid damage from lightning and power surges.

Before powering on the Switch, verify that the network cables and the power cable are securely connected.

CAUTION: The Switch has no ON/OFF switch. The only way to power on and power off the Switch is by connecting and disconnecting the power cord. This is called “power cycling”.

To power on the Switch:

1Plug the power cord into the power socket on the rear panel of the Switch. Refer to “(7) Power Socket” on page 13 for more information.

2Plug the other end of the power cord into a power outlet.

When the Switch is powered on, the Power LED lights up. If the Power LED does not light up, refer to “(6) Self-adhesive Pads” on page 13 for more information.

Checking for Correct Operation

After you power on the Switch, it automatically performs a power-on self-test (POST). During POST, the Power LED on the front panel of the Switch flashes green.

When POST is complete, the Power LED turns green. If the Power LED turns yellow after POST, it means that POST failed and the Switch has entered fail-safe mode.

The following summarizes the possible colors for the Power LED after POST.

Status	Meaning

Green	The unit is powered on and ready to use.
Yellow	Power-on self-test or loopback test failed. The
	Switch is in fail-safe mode. This can happen if a
	port or ports fail when the Switch was powered
	on.

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Contents Baseline Switch PWR Plus 3C164913Com Corporation 350 Campus Drive Marlborough MA USA Contents Snmp Regulatory Notices Glossary Index Page About this Guide ConventionsDocumentation Comments Product RegistrationAutosensing of MDI/MDIX Connections Overview of the Baseline SwitchFeatures and Capabilities Autonegotiating 10/100 Mbps PortsGigabit Combo Ports RJ-45/SFP Physical FeaturesPower-over-Ethernet Capability Front PanelGigabit Combo Ports RJ-45/SFP Link/Activity Status LEDs Power LED Rear PanelPackage Contents Positioning the Switch Before You BeginUsing the Mounting Kit Rack-Mounting or Free-StandingMontagesatz Anweisungen Placing Units On Top of Each OtherSupplying Power to the Switch Checking for Correct OperationUsing SFP Tranceivers Approved SFP TransceiversInserting an SFP Transceiver Removing an SFP Transceiver Inserting an SFP TransceiverPerforming Spot Checks Installing the Switch Requirements for Accessing the Web Interface Running the Discovery ApplicationWelcome screen of Discovery appears Logging On to the Web Interface Discovered Devices ScreenNavigating the Web Interface MenuLists the available items on the menu Menu Item Buttons Port StatusAccessing the Interface Without Using Discovery Dhcp Assigned IP AddressManually Assigned Static IP Address Configuration Overview Device Summary InformationDevice View Polling IntervalAutomatic IP Configuration Administration SettingsModifying the IP Address Settings Color KeyIP Setup To set the IP address for the SwitchBackup Configuration Restore ConfigurationFirmware Upgrade Upgrade ScreenReboot InitializeSystem Access User SummaryCreate User Modify UserSystem Time Remove UserSetup SummarySnmp Add Configuring VLANs Snmp RemoveVlan Modify Vlan Modify PortRename Modify Port ScreenRemove Port DetailVlan Detail Sample Vlan Configurations Forwarding Tagged/Untagged FramesSetting Up Two VLANs on the Same Switch Setting Up Vlan Across Two SwitchesTagged Vlan Configuration Spanning TreeSpanning Tree Screen Igmp Snooping Igmp QueryBroadcast Storm Broadcast Storm Setup Screen PoEConfiguring Port Settings AdministrationPort Administration Summary Screen DetailPort Administration Setup Screen Speed/Duplex for 1000 Mbps ConnectionsLink Aggregation Guidelines for Creating TrunksCreate Link Aggregation Summary ScreenModify Link Aggregation Modify ScreenSpanning Tree per Port Spanning Tree Summary Screen Spanning Tree Setup Screen Port MirroringPort Mirroring Setup Screen StatisticsQoS VoIP Traffic Settings QoS VoIP Summary ScreenPort Setup QoS VoIP Setup ScreenOUI Summary OUI AddSecurity Radius ClientConfigure Radius Client Detail Screen802.1X Settings 802.1X Summary Screen802.1X Detail Screen Monitoring Address TableCable Diagnostics Address Table ScreenDiagnostics Cable Diagnostic ScreenTroubleshooting Resetting to Factory DefaultsForgotten Password Solving LED IssuesForgotten Static IP Address Fiber cable is connected, but the Module Active LED is off Link/Activity LED is on, but network performance is poorIf the Problem Persists All ports appear to show continual activityPurchase Value-Added Services Troubleshoot Online Access Software DownloadsRegister Your Product Telephone Technical Support and Repair Contact UsCountry Telephone Number Latsupportanc@3com.com Physical Related StandardsEnvironmental ElectricalAppendix B Technical Information Safety Information Important Safety InformationAppendix C Safety Information Regulatory Notices Page 1000BASE-T Auto-negotiationBandwidth Category 5e Cables Category 3 CablesCategory 5 Cables Category 6 CablesIeee 802.1D Full DuplexHalf Duplex Ieee 802.1QMAC Address LayerLink Aggregation NetworkSubnet Address SwitchServer Subnet MaskVlan Index NumbersIndex