5
•
Keep the switch far away from radio transmitting stations, radar stations, and high-frequency
devices.
•
Use electromagnetic shielding, for example, shielded interface cables, when necessary.
•
Route interface cables indoors.
Lightning protection
To better protect the switch from lightning, follow these guidelines:
•
Make sure the grounding cable of the chassis is well grounded.
•
Make sure the grounding terminal of the AC power receptacle is well grounded.
Installation preparation checklist
Table 5
Installation preparation checklist
Item Requirements
Result
Installation
site
Ventilation
•
There is a minimum clearance of 10 cm (3.9 in) around
the inlet and outlet vents for heat dissipation of the switch
chassis.
•
A ventilation system is available at the installation site.
Temperature
0°C to 45°C (32°F to 113°F)
Relative humidity
5% to 95% (noncondensing)
Cleanness
•
Dust concentration
≤
3 × 104 particles/m3
•
No dust on desk within three days.
ESD prevention
•
The equipment and rack are well grounded.
•
The equipment room is dust-proof.
•
The humidity and temperature are at a proper level.
•
Wear an ESD-preventive wrist strap. Make sure the wrist
strap makes good skin contact and is well grounded.
EMI prevention
•
Take effective measures to protect the power system from
the power grid system.
•
Separate the protection ground of the switch from the
grounding device or lightning protection grounding
device as far as possible.
•
Keep the switch far away from radio stations and radar
and high-frequency devices working in high current.
•
Use electromagnetic shielding when necessary.
Lightning
protection
•
The grounding cable of the chassis is well grounded.
•
The grounding terminal of the AC power receptacle is
well grounded.
Electricity safety
•
Equip a UPS.
•
In case of emergency during operation, switch off the
external power switch.
