3Com Router 3012 Installation Manual page 20

20 C 2: I
HAPTER NSTALLING THE
General Site
Requirements
R
OUTER
During the installation, wear an ESD (Electro-Static Discharge) preventive wrist
■
strap and ESD-preventive gloves. See "Static Electricity" on page 20 for
additional information on ESD prevention.
3Com recommends that you use an uninterrupted power supply (UPS) with your
router.
The environment of the installation site influences the performance and lifetime of
the router. The installation site for your router should meet the following
requirements for temperature and humidity, dust, gases, static electricity, and
electromagnetic discharge.
Temperature and Humidity
To ensure normal operation and to prolong the operational lifetime of the router,
the temperature and humidity of the equipment room must be within controlled
limits. The requirements for the temperature and humidity of the router
installation site are listed in Table 22.
Table 22 Temperature and Humidity Requirements
Temperature
0 0 to 40 0 C (32 0 to 104 0 F)
Dust
Dust is harmful to the safe operation of the router. The specifications for the dust
content and diameter of the granule within the equipment room are listed in
Table 23.
Table 23 Specification for Dust Content
Maximum diameter (µ m)
Maximum density (the number
of granules per cubic meter)
Gases
The equipment room of the router must meet strict requirements for the content
of salt, acid and sulfide. The specific limitation values of these harmful gases are
given in Table 24.
Table 24 Harmful Gas Limitation Values in Equipment Room
Gas
SO
2
H S
2
NO
2
NH
3
Cl
2
Static Electricity
To prevent damage caused by the static electricity, insure that:
The equipment is grounded
■
Relative humidity
5% to 85%
0.5 1
1.4 x 10 7 7 x 10 5
Average (mg/m 3 ) Maximum (mg/m
0.2 1.5
0.0 0.03
0.04 0.15
0.05 0.15
0.01 0.3
3 5
2.4 x 10 5 1.3 x 10 5
3 )