3Com 2900 Installation Preparations, Safety Precautions, Installation Site, Temperature/Humidity

2 Installation Preparations

Safety Precautions

To avoid any device impairment and bodily injury caused by improper use, observe these rules:

zBefore cleaning the switch, plug out the power cord of the switch first. Do not clean the switch with wet cloth or liquid.

zDo not place the switch near water or in a damp environment. Prevent water or moisture from entering the switch chassis.

zDo not place the switch on an unstable case or desk. The switch might be damaged severely in case of a fall.

zEnsure proper ventilation of the equipment room and keep the ventilation vents of the switch free of obstruction.

zConnect the yellow-green protection PGND cable before power-on.

zMake sure that the operating voltage is in the range labeled on the power of the switch.

zDo not open the chassis to avoid electrical shocks when the switch is operating or just when the switch is powered off.

Installation Site

The 3Com Baseline Switch 2900 Family must be used indoors. You can mount the switch in a rack or on a workbench, but make sure:

zAdequate clearance is reserved at the air inlet/exhaust vents for ventilation.

zThe rack or workbench has a good ventilation system.

zThe rack is sturdy enough to support the device and its accessories.

zThe rack or workbench is well earthed.

To ensure normal operation and long service life of your switch, install it in an environment that meets the requirements described in the following subsections.

Temperature/Humidity

You must maintain a proper temperature and humidity in the equipment room. Long-term high humidity may lead to bad insulation, electricity leakage, mechanical property changes, and metal corrosion. However, if the relative humidity is too low, captive screws may become loose as the result of contraction of insulation washers and static electricity may be produced in a dry environment to jeopardize the circuits on the device. A high temperature is the most undesirable condition, because it accelerates the aging of insulation materials and thus significantly lowers reliability and service life of the switch.

For the temperature and humidity requirements of different models, refer to Table 2-1 on page 2-2.

Cleanness

Dust is a hazard to the operating safety of your device. The dust accumulated on the chassis can be adsorbed by static electricity and result in poor contact of metal connectors or metal contact points.

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