H3C Technologies H3C WX5500E Series Access Controllers - Manual (Page 8)

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• Always check that the power has been disconnected when you perform operations that require the
device to be powered off.
Laser safety
WARNING!
Do not stare into any fiber port when the device is powered on. The laser light emitted from the optical
fiber might hurt your eyes.
• Before you disconnect the fiber connector, execute the shutdown command in interface view to
disable the optical source.
• Install the dust covers to the optical fiber connector to avoid connector damage.
Examining the installation site
The device can only be used indoors. To ensure normal operation and a long lifespan for your device,
the installation site must meet the requirements in this section.
Temperature and humidity
Maintain appropriate temperature and humidity in the equipment room.
• Continuous high relative humidity can cause poor insulation, electricity creepage, and metal
corrosion and can change the mechanical property of materials.
• Continuous low relative humidity can cause washer contraction and ESD and introduce problems
such as loose captive screws and circuit failure.
• High temperature can accelerate the aging of insulation materials and significantly lower the
reliability and lifespan of the device.
To ensure correct operation of the device, the equipment room must meet the temperature and humidity
requirements listed in
Table 1 .
Table 1 Temperature/humidity requirements in the equipment room
Temperature Relative humidity
0°C to 45°C (32°F to 113°F) 5% to 95%, noncondensing
Cleanness
Dust buildup on the chassis can result in electrostatic adsorption, which causes poor contact of metal
components and contact points, especially when indoor relative humidity is low. In the worst case,
electrostatic adsorption can cause communication failure. To ensure correct operation, the equipment
room must meet the dust concentration requirements listed in Table 2 .