H3C Technologies H3C S9500 Series Switches - Manual (Page 65)

Installation Manual
H3C S9500 Series Routing Switches
Chapter 3 Installation Preparation
3-3
density and is invisible to human eyes; when a beam of light enters the eye, retina may
be burned.
Caution:
The laser inside the optical fiber may hurt your eyes.
3.2 Examining Installation Site
The S9500 series can only be used indoors. To ensure that the switch works normally
and to prolong its service lifetime, the following requirements should be met in terms of
installation environment.
3.2.1 Temperature/Humidity Requirements
To ensure the normal operation and service lifetime of a switch, proper temperature
and humidity should be maintained in the equipment room. Long-lasting high humidity
in the equipment room is prone to poor insulation or even leakage of the insulating
material. Sometimes, the mechanical performance deterioration, the rustiness and
corrosion of some metal parts are also more likely to occur. If the relative humidity is too
low, the captive screws may become loose due to the insulation washer contraction.
Meanwhile, the electrostatic is likely to be produced in the dry environment, which will
jeopardize the CMOS circuit of the switch. The higher the temperature, the greater the
damage it will do to the switch. Long-lasting high temperature will speed up the aging
process of the insulating materials, greatly lower the reliability of the switch, and
therefore affect its service life seriously.
3.2.2 Cleanness Requirements
Dust is a hazard to the operating safety of the switch. The indoor dust accumulated on
the chassis can cause electrostatic adsorption, which may result in the poor contact of
the connector or metal contact point. This happens more frequently when indoor
relative humidity is low, which will not only shorten the service life of the switch, but also
cause communication failure.
The required specifications on dust content and particle diameter in an equipment room
are shown in the following table.