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Equipment Positioning Guidelines
Installation
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2.2 Equipment Positioning Guidelines
This section provides key guidelines for selecting the optimal installation
locations for the various BreezeACCESS VL system components.
CAUTION
ONLY experienced installation professionals who are familiar with local building and safety codes
and, wherever applicable, are licensed by the appropriate government regulatory authorities should
install outdoor units and antennas.
Failure to do so may void the BreezeACCESS VL product warranty and may expose the end user
or Service Provider to legal and financial liabilities. Alvarion and its resellers or distributors are not
liable for injury, damage or regulation violations associated with the installation of Outdoor Units or
antennas.
Select the optimal locations for the equipment using the following guidelines:
The outdoor unit can be either pole or wall mounted. Its location should
enable easy access to the unit for installation and testing.
The higher the placement of the antenna, the better the achievable link
quality.
AU-ODU units should be installed as close as possible to the antenna.
The antenna connected to the AU-ODU unit, should be installed so as to
provide coverage to all Subscriber Units (SUs) within its service area.
NOTE
The recommended minimum distance between any two antennas serving adjacent sectors is 2
meters. The recommended minimum distance between two antennas serving opposite cells
(installed back-to-back) is 5 meters.
The antenna of the SU (integrated or external)) should be installed to provide
a direct, or near line of sight with the Base Station antenna. The antenna
should be aligned to face the Base Station.
In some cases it might be necessary to up/down-tilt the antenna. An optional
Tilt accessory for the ODU providing a tilt range of +/-15° is available from
Alvarion. The tilt option might be necessary to either improve the link
conditions or, if the SU is too close to the Base Station, to reduce the receive
signals strength. As a rule of thumb, if the SU is located at a distance of less
than 300 meters from the Base Station, it is recommended to up-tilt the
antenna by approximately 10° to 15° (especially in line-of-sight conditions) to
avoid saturation of the receivers by too strong signals.