Beacon Computer Lan Adapter manual Radio Characteristics, Direct Sequence Radio Technology

Welcome to the Aironet 4000 Series Wireless LAN Adapter

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.

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