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CHAPTER 5: Planning and Installing Wireless LANs
5.3.6 L
INK
D
ISTANCE
Link distance is the maximum distance between the Access Point and the station
adapter, usually related to point-to-point installations using external antennas. For
open outdoor areas with an unobstructed line of sight between the Access Point
and the wireless bridge, the suggested maximum distance is:
• up to 7 miles (10 km) in the USA (with an LW0055A Access Point with
external antennas)
• up to 2.5 km in Europe (with an LW0055A Access Point with external
antennas)
NOTE
The maximum distance of 10 km/7 miles is achieved using 24-dBi
antennas. The maximum distance of 2.5 km is achieved using 18-dBi
antennas.
5.3.7 O
UTDOOR
I
NSTALLATIONS
Outdoor installations must have a clear line-of-sight. Solid obstacles such as
buildings or hills prevent the establishment of a link. Partial obstacles such as trees
or traffic can reduce range. Extending coaxial cables can cause an increase in
assembly signal loss and a reduction in range.
5.4 Precautions
CAUTION
Detached antennas, whether installed indoors or out, should be
installed ONLY by experienced antenna-installation professionals who
are familiar with local building and safety codes and, wherever
applicable, are licensed by the appropriate government regulatory
authorities.
5.4.1 T
RANSMIT
A
NTENNA
Regulations regarding maximum antenna gains vary from country to country. It is
your responsibility to operate within the limits of these regulations and to ensure
that the professional installer is aware of these regulations as well. The FCC in the
United States and ETSI in Europe limit effective transit power to 36 dBm (USA)
and 20 dBm (Europe). The maximum total assembly gain of antennas and cables
equals 19 dBi (USA) and 3 dBi (Europe).
Summary of Contents for LW0050A
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