Avaya WLAN Series, Руководство по установке, Страница: 22 / 110

Preparing for Installation
Overview of the Outdoor Installation
2-12 Avaya Outdoor Antenna Installation Guide
Antenna Mast/Wall Bracket
Basically there are two ways to erect an antenna mast:
■
“Tripod Mount”
■
“Wall (Side) Mount”
Tripod Mount
The tripod mount is used primarily on peaked and flat roofs. The antenna mast
must be secured to the roof using 3 or 4 guy wires that are equally spaced
around the mast. When the height of the antenna mast is more than 3 meters
(10 ft), you are advised to use at least three guy wires for each 3 meter (10 ft)
section of the mast.
Wall (Side) Mount
A wall (side) mount allows for mounting an antenna (mast) on the side of a
building or on the side of an elevator penthouse. This will provide a convenient
mounting location when the roof overhang is not excessive and/or the location is
high enough to provide a clear line of sight.
In most situations mounting an antenna directly to the wall will not allow you to
properly align the antenna with the corresponding antenna at the opposite end
of your wireless link. As poor alignment will typically result in poor performance,
Avaya Inc. advises you to always mount the antennas to a mast.
Antenna Mast Requirements
To accommodate the Avaya Wireless antennas, the antenna mast must satisfy
the following requirements:
a. The construction of the mast must be of a sturdy, weatherproof and non-
corrosive material like for example galvanized or stainless steel construction
pipe.
b. Typical diameter of the mast should be between 35 mm (1.4 in.) and 41 mm
(1.625 in.). Subject to the type of antenna that you intend to install other
diameters may be possible as well.
c. The height of the antenna mast must be sufficient to allow the antenna to be
installed at least 1.5 m (5 ft.) above the peak of roof. If the roof is metal, then
the height of the antenna should be a minimum of 3 m (10 ft) above the roof
(see also Chapter 3 “Determine Range & Clearance”).
d. The mast or wall-bracket must be free from any substance that may prevent
a good electrical connection with the antenna; for example, paint.