Safety Of Laser; Examining Installation Site; Temperature/Humidity Requirements; Cleanness Requirements - H3C S7500 Series Installation Manual

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H3C EPON OLT Installation Manual

3.1.5 Safety of Laser

Some LPUs of S7500 Series Ethernet Switches have optical interfaces. In operating

status, it is prohibited to stare into the open optical interface because the laser being

transmitted through the optical fiber will produces a small beam of light, it has very high

power density and is invisible to human eyes, when a beam of light enters the eye,

retina may be burned.

Caution:

Staring at the laser beam inside the fiber could hurt your eyes.

S7500 series Ethernet switches can only be used indoors. To ensure that the switch

works normally and expand its service life, the installation environment shall meet the

requirements below.

To ensure the normal operation and service life of a switch, a certain level of

temperature and humidity should be maintained in the equipment room. If the humidity

in the equipment room is too high for a long time, it will lead to bad insulation of the

insulating material or even creepage. Sometimes, the mechanical performance

changes of material, the rustiness and corrosion of some metal parts are also likely to

occur. If the relative humidity is too low, the captive screws may become loose due to

the shrinkage of the insulation washers. 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 on the switch. High

temperature for a long time will speed up the aging process of the insulation materials,

greatly lower the reliability of the switch and therefore affect its service life seriously.

Dust is a big harm for the normal operation of the switch. The indoor dust accumulated

on the chassis can cause electrostatic adsorption, resulting in the poor contact of the

connector or metal contact point. This happens more frequently when the relative

indoor 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.

Chapter 3 Installation Preparation

3-3

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