Nortel 6220, Руководство пользователя, Страница: 25 / 178

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Planning your WLAN Network
The wireless network is much different than a wired network. The
Installation of a wireless network requires some additional planning.
This planning includes RF Link Engineering like RF Path planning, site
selection, and back-bone network preparation.
The radio links between all end sites are specified as three types of
environmental connection as listed below:
LOS (Line Of Sight)
OLOS (Optical LOS)
NLOS (Non LOS)
Because High Frequency Radio travels in a straight forward line, a clear
LOS (line-of-sight) between antennas is efficient and ideal. Frequently,
locations of the desired links are fixed.
When you cannot achieve a clear line-of-sight, you must plan according
to basic consideration:
The Basic considerations for sites include:
▪ Installation Facility must be constructed (Electric Pole, Tower)
▪ Possibility of future obstructions
- Trees that may obstruct the path
- Buildings between the sites that may obstruct the path
▪ Lightening
▪ Distance between sites and Network Structure
▪ Strong RF interference