Aironet PCI4810B Guia do Utilizador descarregar pdf (Página 59)

Appendix A: Aironet Wireless LAN Adapter Overview

Other Devices in the Wireless Network

Refer to the User’s Guide and Technical Reference

manual for the Access Point, Universal Client, or Bridge

for additional information.

Radio Characteristics

The PCI/ISA Card operates in the 2.4 GHz license-free

Industrial Scientific and Medical (ISM) band. Data is trans-

mitted over a half-duplex radio channel operating up to 11

Mbps.

Direct Sequence Radio Technology

The Aironet 4800B Series PCI/ISA Wireless LAN Adapter

uses Direct Sequence Spread Spectrum (DSSS) transmis-

sion originally developed for military “anti-jamming” and

“low probability of intercept” radio systems. The signal is

transmitted over a wide frequency range, using multiple fre-

quencies simultaneously. This protects the data transmis-

sion 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 4800B Series PCI/

ISA Wireless LAN Adapter will usually still be successful in

its transmission.

Data Transparency and Protocols

The Aironet 4800B Series PCI/ISA Wireless LAN Adapter

transports data packets transparently as they move through

the wireless infrastructure. The PCI/ISA Card operates sim-

ilarly 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

4800B Series PCI/ISA Wireless LAN Adapter.

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Aironet PCI4810B Guia do Utilizador Página 59