Grounding; Cooling; Space - HP JG221A Installation Manual

Route interface cables only indoors to prevent signal ports from getting damaged by overvoltage or

overcurrent caused by lightning strikes.

Grounding

Using a good grounding system to protect your switch against lightning shocks, interferences, and ESD is
essential to the operating reliability of your switch. Make sure that the resistance between the chassis and
ground is less than 1.5 ohm. For more information about grounding the A3100 v2 Switch Series, see
―Grounding the

Cooling

The cooling system of the A3100 v2 Switch Series varies by the switch model:
Non PoE switches (fanless): There are openings on the left, right, and rear of the switch for natural heat

dissipation.
PoE switches (built-in fans): Fans blow air from the left to the right of the chassis for heat dissipation. See

Figure 15.
Figure 15 Airflow through a PoE switch
(1) Air intake
For adequate heat dissipation, plan the installation site according to the airflow of your switch, and adhere
to the following requirements:
Leave a clearance of at least 10 cm (3.94 in) around the air intake and exhaust vents.

Consider the heat dissipation of the installation site when determining air-conditioning requirements to

ensure that cool air can enter the switch.
 Make sure the hot air generated by equipment at the bottom of the rack is not drawn in the intake of the
equipment above.
The installation site has a good cooling system.


Space

For adequate ventilation and ease of maintenance, adhere to the following requirements:
The clearance between the rack and walls or other devices is at least 1 m (3.28 ft).

The headroom in the equipment room is no less than 3 m (9.84 ft).

switch.‖
1
(2) Air exhaust
10
2