Installation Manual
H3C S7500E Series Ethernet Switches
Chapter 2 Installation Preparations
2-3
2.1.5 Laser Safety
Some LPUs of the S7500E series 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.
2.2 Examining Installation Site
The S7500E series 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.
2.2.1 Temperature/Humidity Requirements
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.
Table 2-1
Temperature/humidity requirements
Temperature
Relative humidity
Working condition
Idle condition
Working condition
Idle condition
0
0
C to 45
0
C (32
0
F
to 113
0
F)
–40
0
C to +70
0
C
(–40
0
F to +158
0
F)
10% to 95%,
noncondensing
5% to 95%,
noncondensing