3-7
Checklist Before Installation
Table 3-4
Checklist before installation
Item
Requirements
Ventilation
There is a minimum clearance of 10 cm (3.9 in.) around
the inlet vents and exhaust vents for heat dissipation of
the router chassis.
A ventilation system is available at the installation site.
Temperature
0°C to 45°C (32°F to 113°F)
Relative humidity
10% to 95% (noncondensing)
Cleanness Dust
concentration
≤
3 × 10
4
particles/m³
ESD prevention
The equipment and the floor are well grounded.
The equipment room is dust-proof.
The humidity and temperature are at a proper level.
Always wear an ESD-preventive wrist strap and antistatic
clothing when touching a circuit board.
Place the removed MPU, LPU, memory module, or CF
card on an antistatic workbench, with the face upward, or
put it into an antistatic bag.
Touch only the edges, instead of electronic components,
when observing or moving a removed MPU, LPU,
memory module or CF card.
EMI prevention
Take effective measures to protect the power system
from power grid interference.
Separate the protection ground of the router from the
grounding device or lightning protection grounding
device as far as possible.
Keep the router far away from heavy-duty radio
transmitters, radar transmitters, and high-frequency
devices.
Adopt electromagnetic shielding measures when
necessary.
Lightning prevention
The PGND cable of the chassis is well grounded.
The grounding terminal of the AC power socket is well
grounded.
A power lightning arrester is installed. (Optional)
A port lightning arrester is installed. (Optional)
Signal lightning arresters are installed. (Optional)
Electricity safety
Equip an uninterrupted power supply (UPS).
In case of emergency during operation, switch off the
external power switch.
Workbench
The workbench is stable enough.
The workbench is well grounded.
Installation
site
Cabinet-mounting
requirements
Install the firewall in an open cabinet if possible. If you
install the firewall in a closed cabinet, make sure that the
cabinet is equipped with a good ventilation system.
The rack is sturdy enough to support the weight of the
firewall and installation accessories.
The size of the cabinet is appropriate for the firewall.
The front and rear of the cabinet are at least 0.8 m (31.5
in.) away from walls or other devices.
Safety
precautions
The firewall is far away from any moist area and heat source.
The emergency power switch in the equipment room is located.
