Hewlett Packard Enterprise Company AP175 Manual Do Utilizador
8
Aruba AP-175 Outdoor Access Point
| Installation Guide
Antenna Position and Orientation
Once the required antenna height has been determined, other factors affecting the precise position of the
wireless bridge or mesh link must be considered:
wireless bridge or mesh link must be considered:
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Be sure there are no other radio antennas within 2 m (6 ft) of the wireless bridge or mesh link. These
include other WiFi radio antennas.
include other WiFi radio antennas.
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Place the wireless bridge or mesh link away from power and telephone lines.
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Avoid placing the wireless bridge or mesh link too close to any metallic reflective surfaces, such as roof-
installed air-conditioning equipment, tinted windows, wire fences, or water pipes. Ensure that there is at
least 5 feet clearance from such objects.
installed air-conditioning equipment, tinted windows, wire fences, or water pipes. Ensure that there is at
least 5 feet clearance from such objects.
z
The wireless bridge or mesh link antennas at both ends of the link must be positioned with the same
polarization direction, either horizontal or vertical. Proper alignment helps to maximize throughput.
polarization direction, either horizontal or vertical. Proper alignment helps to maximize throughput.
Radio Interference
The avoidance of radio interference is an important part of wireless link planning. Interference is caused by
other radio transmissions using the same or an adjacent channel frequency. You should first scan your
proposed site using a spectrum analyzer to determine if there are any strong radio signals using the 802.11a/
b/g channel frequencies. Always use a channel frequency that is furthest away from another signal.
other radio transmissions using the same or an adjacent channel frequency. You should first scan your
proposed site using a spectrum analyzer to determine if there are any strong radio signals using the 802.11a/
b/g channel frequencies. Always use a channel frequency that is furthest away from another signal.
If radio interference is still a problem with your wireless bridge or mesh link, changing the antenna
direction may improve the situation.
direction may improve the situation.
Weather Conditions
When planning wireless bridge or mesh links, you must take into account any extreme weather conditions
that are known to affect your location. Consider these factors:
that are known to affect your location. Consider these factors:
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Temperature: The wireless bridge or mesh link is tested for normal operation in temperatures from
-. Operating in temperatures outside of this range may cause the unit to fail.
-. Operating in temperatures outside of this range may cause the unit to fail.
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Wind Velocity: The wireless bridge or mesh link can operate in winds up to. You must consider the
known maximum wind velocity and direction at the site and be sure that any supporting structure, such
as a pole, mast, or tower, is built to withstand this force.
known maximum wind velocity and direction at the site and be sure that any supporting structure, such
as a pole, mast, or tower, is built to withstand this force.
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Lightning: Rain: The wireless bridge or mesh link is weatherproofed against rain. However, it is
recommended to apply weatherproof sealing tape around the Ethernet port and antenna connectors for
extra protection. If moisture enters a connector, it may cause a degradation in performance or even a
complete failure of the link.
recommended to apply weatherproof sealing tape around the Ethernet port and antenna connectors for
extra protection. If moisture enters a connector, it may cause a degradation in performance or even a
complete failure of the link.
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Snow and Ice: Falling snow, like rain, has no significant effect on the radio signal. However, a buildup of
snow or ice on antennas may cause the link to fail. In this case, the snow or ice has to be cleared from
the antennas to restore operation of the link.
snow or ice on antennas may cause the link to fail. In this case, the snow or ice has to be cleared from
the antennas to restore operation of the link.
N O T E
Local regulations may limit or prevent construction of a high radio mast or tower. If your wireless bridge or mesh link
requires a high radio mast or tower, consult a professional contractor for advice.
!
CAUTION
An Aruba Lightning Arrestor, AP-LAR-1, must be installed on each antenna port for protection against lightning
induced surges. Failure to use an AP-LAR-1 can void the warranty of an Aruba outdoor AP model and renders the
AP susceptible to failure from lightning induced surges
AP-175-IG-Rev01.fm Page 8 Friday, September 17, 2010 4:27 PM