User`s guide

Welcome to the Aironet 4000 Series Wireless LAN Adapter
1-4
Radio Characteristics
The Wireless LAN Adapter 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 Mbps (4500 Series) or 11 Mbps (4800 Series).
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. This protects the data transmission from inter-
ference.
Data Transparency and Protocols
The Aironet 4000 Series Wireless LAN Adapter transports
data packets transparently as they move through the
wireless infrastructure. The Wireless LAN Adapter operates
similarly to a standard network product except the wire is
replaced with a radio connection. No special wireless net-
working functions are required. All existing applications,
which operate over a network, will operate using the Aironet
4000 Series Wireless LAN Adapter.