Aironet Lan Adapter - Manual (Page 22)

Welcome to the Aironet 4000 Series Wireless LAN Adapter
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Link Test
The link test tool is used to determine RF coverage. The
test results help the installer eliminate low RF signal
level area that can result in loss of connection.
Radio Antenna
The Snap-On Diversity antenna comes standard with the
PC Card and provides omni-directional coverage.
A benefit of the diversity antenna system is improved cover-
age. At the edges of the RF coverage or fringe areas, there
are very often multiple signals reaching the receiver, all
from the same transmitter. These signals travel in different
paths (multipath) and are caused by reflection and shadows
of the RF signals. When the signals combine, the receiver
may have trouble decoding the data. The Aironet radio’s
ability to switch and sample between these antennas allows
it to select the optimum antenna for receiving the packet.
Optional antennas are offered for the PC Card. Consult the
Aironet Antenna Guide document number 710-003725 for
more information.
Security Features
The Aironet 4000 Series Wireless LAN Adapter employs
Direct Sequence Spread Spectrum Technology, previously
developed for military “anti-jamming” and “low probability of
intercept” radio systems.
The Aironet Access Point must be set to the same Service
Set Identifier (SSID) as all other Aironet devices on the
wireless infrastructure. Units with a different SSID will not
be able to directly communicate with each other.