User's Manual

February 2003
Rev. A
Page 14 of 47
2.4. AU/SU Outdoor Installation
2.4.1. Site Selection
2.4.1.1. Access Unit (AU)
Location of the Access Unit is on the Service Provider sole discretion considering local topology
and the desired cover. One (in case of Omni antenna) or several AUs (in case of directional
antenna) forms the BS (Base-Station) – the central of a cell. The placement of AUs should be
such that cells overlap slightly, to guarantee seamless wireless connectivity everywhere.
Neighboring AUs should preferably send and receive on different channels or different polarization
for maximum throughput (minimum interference). The radio channels depend on the regulations in
your area. Table 2-1 provides the specifications for main regulatory domains:
Region Regulatory
Domain
Relevant Radio
Channels
USA FCC 0 – 12
Canada DOC 0 – 12
Europe
(Except Spain and France)
ETSI 0 - 12
Spain SPAIN 10
France FRANCE 10
Table 2-1: Regulatory Domain Specification
For channel frequency list see Table 8-1 in Appendix E – RF Channel List

This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received, including interference that may cause undesired operation.

2.4.1.2. Subscriber Unit (SU)
Location of the Subscriber Unit must take into consideration the following guidelines:
• Clear line of site to the AU.
• Height above the ground.
• Distance between sites.
Path of Clearest Propagation
A propagation path is the path that signals traverse between the antennas of any two bridges.
The “line” between two antenna sites is an imaginary straight line, which may be drawn