H3C Technologies H3C WA2600 Series WLAN Access Points - Manual (Page 12)

7
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 2 (0.01 in 2 ) 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 2 (0.05
in 2 ), or weld them directly. Use anti-erosion treatment on the welding joint.