Aironet Lan Adapter - Manual (Page 19)

Welcome to the Aironet 4000 Series Wireless LAN Adapter
1-5
Radio Characteristics
The PC Card operates in the 2.4 GHz license-free Industrial
Scientific and Medical (ISM) band. Data is transmitted over
a half-duplex radio channel operating up to 2 Megabits per
second (Mbps) for the PC4500 or up to 11 Mbps for the
PC4800.
Direct Sequence Radio Technology
The Aironet 4000 Series Wireless LAN Adapter uses Direct
Sequence Spread Spectrum (DSSS) transmission
previously developed for military “anti-jamming” and “low
probability of intercept” radio systems. The signal is
transmitted over a wide frequency range, using multiple
frequencies simultaneously. This protects the data
transmission from interference.
If a particular frequency encounters a level of noise and/or
interference, there is enough redundancy built into the sig-
nal on other frequencies that the Aironet 4000 Series Wire-
less LAN Adapter will usually still be successful in its
transmission.
Data Transparency and Protocols
The Aironet 4000 Series Wireless LAN Adapter transports
data packets transparently as they move through the
wireless infrastructure. The PC Card operates similarly to a
standard network product except the wire is replaced with a
radio connection. No special wireless networking functions
are required. All existing applications, which operate over a
network, will operate using the Aironet 4000 Series
Wireless LAN Adapter.