3Com 2900 manual Mounting the Switch on a Workbench, Connecting the Pgnd Cable

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Mounting the Switch on a Workbench

In many cases, standard 19-inch cabinets are not available. Therefore, switches are often placed on clean workbenches. To place the switch on a workbench, follow these steps:

Step1 Place the switch with bottom up carefully, and then clean the round holes on the chassis bottom with dry cloth.

Step2 Attach the rubber feet to the four round holes on the chassis bottom.

Step3 Place the switch with upside up on the workbench.

During the operation, you simply need to:

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Make sure that the workbench is flat and sturdy.

Ensure good ventilation and a space of 10 cm (3.94 in.) around the chassis for heat dissipation. Avoid heavy objects on the switch.

Connecting the PGND Cable

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Correctly connecting the switch PGND cable is crucial to the lightning protection and electromagnetic susceptibility (EMS) of a switch.

The power receptacles and grounding terminals in this section are for illustration only.

The power input end of the switch is connected with a noise filter, whose central ground is directly connected to the chassis, forming the so-called chassis ground (commonly known as PGND). This chassis ground must be securely connected to the earth so that the faradism and leakage electricity can be safely released to the earth, enhancing the EMS capability of the switch.

When a Grounding Strip is Available

When a grounding strip is available at the installation site, attach one end of the yellow-green PGND cable of the switch to the grounding screw on the grounding strip (the grounding screw and the grounding hole are on the rear panel of the switch and are marked with a grounding sign). To do this, follow these steps:

Step1 Remove the grounding screw from the rear panel of the switch chassis.

Step2 Put the supplied OT terminal of the PGND cable on the grounding screw.

Step3 Fasten the grounding screw, which is attached with the OT terminal of the PGND cable, into the grounding screw hole with a screwdriver.

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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 Product Overview IntroductionPage 3Com Baseline Switch 2920-SFP Plus Power Supply SystemFront 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 Specification PortsConsole Port 10/100/1000Base-T Ethernet PortTransceiver Central Connector Type 1000Base-X SFP InterfaceFiber 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 Installation Preparations Safety PrecautionsInstallation Site Temperature/HumidityLaser Safety Electromagnetic SusceptibilityDust 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 Model Mounting position Description See -6 , FigureMounting 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 the Power Cord Connecting an AC Power CordVerifying the Installation Connecting an RPS DC Power CordPage Initial Power-On Setting Up the Configuration EnvironmentConnecting the Console Cable RJ-45 Signal Direction DB-9Setting Terminal Parameters Connection Procedure4Set 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 Changing the Boot Mode Enter 9. The system prompts you to change the startup 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 Task Remarks Change the rate of the serial port on the terminalDescription Page 2Properties dialog box 5Transfer menu Restoring the download rate to the default Page Loading Files Using Tftp Through Ethernet Port Introductin to TftpLoad File Name Loading an application file Loading Files Using FTP Through Ethernet Port Introduction to FTPParameters are described in Table 5Description of the FTP parameters Loading an application file Maintenance and Troubleshooting Password LossUser Password Loss Boot ROM Password LossPower Supply Failure With AC power inputWith 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