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Chapter 5 - glossary – Asus WL-160N User Manual

Page 33

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ASUS WLAN Adapter

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Chapter 5

Chapter 5 - Glossary

Glossary

The 802.11b spectrum is plagued by saturation from wireless phones, microwave

ovens and other emerging wireless technologies, such as Bluetooth. In contrast,

802.11a spectrum is relatively free of interference.
The 802.11a standard gains some of its performance from the higher frequencies

at which it operates. The laws of information theory tie frequency, radiated power

and distance together in an inverse relationship. Thus, moving up to the 5-GHz

spectrum from 2.4 GHz will lead to shorter distances, given the same radiated

power and encoding scheme.
Compared with 802.11g: 802.11a is a standard for access points and radio NICs

that is ahead of 802.11g in the market by about six months. 802.11a operates in the

5GHz frequency band with twelve separate non-overlapping channels. As a result,

you can have up to twelve access points set to different channels in the same

area without them interfering with each other. This makes access point channel

assignment much easier and significantly increases the throughput the wireless

LAN can deliver within a given area. In addition, RF interference is much less likely

because of the less-crowded 5 GHz band.

IEEE 802.11b (11Mbits/sec)

In 1997, the Institute of Electrical and Electronics Engineers (IEEE) adopted the

802.11 standard for wireless devices operating in the 2.4 GHz frequency band. This

standard includes provisions for three radio technologies: direct sequence spread

spectrum, frequency hopping spread spectrum, and infrared. Devices that comply

with the 802.11 standard operate at a data rate of either 1 or 2 Mbps.
In 1999, the IEEE created the 802.11b standard. 802.11b is essentially identical

to the 802.11 standard except 802.11b provides for data rates of up to 11 Mbps

for direct sequence spread spectrum devices. Under 802.11b, direct sequence

devices can operate at 11 Mbps, 5.5 Mbps, 2 Mbps, or 1 Mbps. This provides

interoperability with existing 802.11 direct sequence devices that operate only at 2

Mbps.
Direct sequence spread spectrum devices spread a radio signal over a range of

frequencies. The IEEE 802.11b specification allocates the 2.4 GHz frequency band

into 14 overlapping operating Channels. Each Channel corresponds to a different

set of frequencies.

IEEE 802.11g

802.11g is a new extension to 802.11b (used in majority of wireless LANs today)

that broadens 802.11b's data rates to 54 Mbps within the 2.4 GHz band using

OFDM (orthogonal frequency division multiplexing) technology. 802.11g allows

backward compatibility with 802.11b devices but only at 11 Mbps or lower,

depending on the range and presence of obstructions.

Infrastructure

A wireless network centered about an access point. In this environment, the access

point not only provides communication with the wired network but also mediates

wireless network traffic in the immediate neighborhood.