Cooling; Esd Prevention - H3C WSG1840X Installation Manual

Substance
Dust particle diameter ≥ 5 µm
To eliminate corrosion and premature aging of components, the equipment room must also meet
limits on salts, acids, and sulfides, as shown in Table1-3.
Table1-3 Harmful gas limits in an equipment room
Gas
SO
2
H S
2
NH
3
Cl
2
NO
2

Cooling

For adequate heat dissipation of the device, follow these guidelines:
•
Plan the installation site for the device based on the airflow direction
•
Reserve a minimum clearance of 100 mm (3.94 in) around the air vents.
•
Make sure the rack or workbench has a good ventilation system.

ESD prevention

On the communication network, ESD comes from the following sources:
•
External electric field such as outdoor high-voltage power lines and thunder and lightning.
•
Indoor environment, floor materials, device materials, and device components.
To prevent electrostatic discharge (ESD), follow these guidelines:
•
Ground the device reliably.
•
Take dust-proof measures for the equipment room. For more information, see "Cleanliness."
•
Maintain the humidity and temperature at acceptable levels. For more information, see
"Temperature and
•
Before working with the device, wear ESD gloves and ESD garment, and remove conductive
objects such as jewelry or watch. Make sure the wrist strap makes good skin contact and is
reliably grounded.
•
Always remember to wear an ESD wrist strap when working with a transceiver module.
No ESD wrist strap is provided with the device. Prepare one yourself.
To attach an ESD wrist strap:
1. Wear the wrist strap on your wrist.
2. Lock the wrist strap tight around your wrist to maintain good contact with the skin.
3. Secure the wrist strap lock and the alligator clip lock together.
4. Attach the alligator clip to the rack.
5. Make sure the rack is reliably grounded.
Concentration limit (particles/m
Max. (mg/m
0.2
0.006
0.05
0.01
0.04
humidity."
3
3
)
3
)