H3c-technologies H3C WA2600 Series WLAN Access Points Bedienungsanleitung PDF herunterladen (Seite 12)

Power supply

The AP can be powered by a power injector or through PoE+.

Power injector

You can use an H3C POE5 power injector to power the AP. For more information about how to power

the AP through the power injector, see “Connecting the AP to a power injector.”

NOTE:

The power injector is not shipped with the AP and must be ordered separately.

PoE+

If the switch connected to the AP is PoE+ capable, the AP can be powered by the switch through the cable

between the 10/100/1000BASE-TX port of the AP and the Ethernet port of the switch.

Grounding and lightning protection

Table 6 Grounding and lightning protection requirements

Item Requirements

Grounding resistance

• The grounding resistance is usually required to be less than 5 ohms, and less than

10 ohms in an area with less than 20 thunderstorm days a year. If a piece of angle

steel is buried as the grounding conductor, the grounding resistance is required to

be less than 10 ohms. In an area with a higher grounding resistance, reduce the

grounding resistance by using brine or resistance reducing agent around the

grounding conductor.

• The top of the grounding conductor should be at least 0.7 m (2.30 ft) away from the

ground surface. In cold areas, the grounding conductor should be buried below

the frozen soil layer.

Grounding

connection

• If a grounding strip is available, connect the yellow and green grounding cable of

the AP to the grounding strip. To make a grounding cable, make sure the cable is

with a cross-section area of at least 6 mm

(0.01 in

) and a length of no longer than

3 m (9.84 ft).

• If no grounding strip is available, bury a piece of angle steel/steel tube at least 0.5

m (1.64 ft) long in the earth to serve as the grounding conductor. In the case of a

piece of angle steel, the size should be at least 50 × 50 × 5 mm (1.97. × 1.97 ×

0.20 in); in the case of a piece of steel tube, it must be zinc-plated and have a wall

thickness of at least 3.5 mm (0.14 in). Weld the yellow and green grounding cable

of the AP onto the grounding conductor and use anti-erosion treatment on the

welding joint. The grounding cable should be as short as possible and must not be

coiled.

• Make sure that the grounding terminals of all the lightning arresters of the AP and

the peer device of the AP are well grounded.

Grounding lead-in

A grounding lead-in is a metal conductor connecting a grounding net and a

grounding strip. The grounding cable of the AP should be connected to the grounding

strip. The grounding lead-in must be 30 m (98.43 ft) or shorter. A piece of zinc-coated

flat steel with a cross-section area of 40 × 4 mm (1.57 × 0.16 in) or 50 × 5 mm (1.97

× 0.20 in) is recommended. Connect the grounding strip and the grounding lead-in of

the AP through the yellow and green grounding cable with an area of 35 mm

(0.05

), or weld them directly. Use anti-erosion treatment on the welding joint.

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