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

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:

Connecting the PGND Cable

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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