3Com 2900 manual Power Supply Failure, With AC power input, With RPS power input

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Power Supply Failure

The 3Com Baseline Switch 2928-HPWR Plus adopts AC power input, RPS power input, or both RPS and AC power inputs. Other 3Com Baseline Switch 2900 Family adopt AC power input only.

You can determine whether the power system of a switch functions normally by viewing the power LED or RPS power LED on the front panel.

With AC power input

When AC power input is used for power supply of a switch, you can check the power LED. The power LED stays on when power system is normal. Otherwise, please check whether:

z

z

z

The power cord is correctly connected, the power receptacle on the switch and the AC power socket function normally.

The power input to the switch is normal.

The operating temperature of the switch is in the appropriate range and good ventilation is ensured for the power supply unit. PoE switches support over-temperature protection, allowing the internal power module to enter the protection state if the temperature is too high and then restore power supply after the temperature becomes normal.

With RPS power input

When RPS power input is adopted, you can check the power LED or RPS power LED to judge the status of the power system. Both LEDs stay on when the power system functions normally. Otherwise, please check whether:

z

z

z

The RPS DC power cord is correctly connected. The RPS power supply is normal.

The operating temperature of the switch is in the appropriate range and good ventilation is ensured for the power supply unit. PoE switches support over-temperature protection, allowing the internal power module to enter the protection state if the temperature is too high and restore power supply after the temperature becomes normal.

With both AC and RPS power supplies

When both the AC and RPS power supplies are adopted, you can check the power LED and the RPS power LED to determine the status of each power input.

1)The power LED is off.

In this case, both the AC and RPS power inputs are abnormal. Please check that:

zThe power cord is correctly connected, the power receptacle on the switch and the AC power socket function normally.

zThe AC power input to the switch is normal.

zThe RPS DC power cord is correctly connected and the RPS power supply is normal.

zThe operating temperature of the switch is in the appropriate range and a good ventilation is ensured for the power supply unit. PoE switches support over-temperature protection, allowing the internal power module to enter the protection state if the temperature is too high and then restore power supply after the temperature becomes normal.

2)The power LED is on while the RPS LED is off. The RPS power input is abnormal, please check that:

zThe RPS DC power cord is correctly connected.

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Contents 3Com Baseline Switch 2900 Family Environmental Statement Organization About This ManualConventions Obtaining Documentation Related DocumentationManual Description Table of Contents Page Introduction Product OverviewPage Power Supply System 3Com Baseline Switch 2920-SFP PlusFront Panel Rear Panel3Com Baseline Switch 2928-SFP Plus 3Com Baseline Switch 2952-SFP Plus 3Com Baseline Switch 2928-PWR Plus 3Com Baseline Switch 2928-HPWR Plus Ports SpecificationConsole Port 10/100/1000Base-T Ethernet Port1000Base-X SFP Interface Transceiver Central Connector TypeFiber Max Transmis Sion DistanceLEDs Power LEDRPS Status LED Port Ethernet port status Switch model Mode Meaning Port Mode LED10/100/1000Base-T Auto-Sensing Ethernet Port Status LED LED 1000Base-X SFP Interface Status LED Safety Precautions Installation PreparationsInstallation Site Temperature/HumidityElectromagnetic Susceptibility Laser SafetyDust concentration limit in the equipment room Gas Maximum concentration mg/mInstallation Tools Introduction to Mounting Brackets Installing a SwitchModel Mounting bracket Description Attaching the Mounting Brackets to a Switch See -6 , Figure Model Mounting position DescriptionMounting the Switch to a Rack Page Connecting the Pgnd Cable Mounting the Switch on a WorkbenchWhen a Grounding Strip is Available Page Other Installation Sites Where a Grounding Conductor Can be BuriedWhen the switch is AC-powered Connecting an AC Power Cord Connecting the Power CordConnecting an RPS DC Power Cord Verifying the InstallationPage Setting Up the Configuration Environment Initial Power-OnConnecting the Console Cable RJ-45 Signal Direction DB-9Connection Procedure Setting Terminal Parameters4Set the serial port used by the HyperTerminal connection 6HyperTerminal window Checking Before Power-On Booting the SwitchPowering On the Switch Describes the fields above 2Description on the fields Enter 9. The system prompts you to change the startup mode Changing the Boot ModeEnter Y. The system displays the following information User interface aux0 is available Press Enter to get started Loading Files Through the Boot ROM Menu Approaches for Loading Application and Configuration FilesLoading Software Introduction to the Boot ROM Menu Loading a Boot ROM file Loading Files Using Xmodem Through Console PortIntroduction to Xmodem Change the rate of the serial port on the terminal Task RemarksDescription Page 2Properties dialog box 5Transfer menu Restoring the download rate to the default Page Introductin to Tftp Loading Files Using Tftp Through Ethernet PortLoad File Name Loading an application file Introduction to FTP Loading Files Using FTP Through Ethernet PortParameters are described in Table 5Description of the FTP parameters Loading an application file Password Loss Maintenance and TroubleshootingUser Password Loss Boot ROM Password LossWith AC power input Power Supply FailureWith RPS power input With both AC and RPS power suppliesTroubleshooting when there is no terminal display Configuration Terminal FailureTroubleshooting when the terminal display is illegible
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