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100-8004-102G Airborne Wireless LAN Node Module Data Book

Page 55

Quatech, Inc. Confidential

This glossary provides a definition of wireless terminology.

802.11

Wireless standards developed by the IEEE that specify an "over-the-air"

interface for wireless Local Area Networks. 802.11 is composed of several

standards operating in different radio frequencies.

802.11a

802.11a is an IEEE specification for wireless networking that operates in the

5 GHz frequency range (5.725 GHz to 5.850 GHz) with a maximum 54 Mbps

data transfer rate. The 5 GHz frequency band is not as crowded as the

2.4-GHz frequency because the 802.11a specification offers more radio

channels than the 802.11b. These additional channels can help avoid radio

and microwave interference.

802.11b

802.11b is the international standard for wireless networking that operates in

the 2.4 GHz frequency range (2.4 GHz to 2.4835 GHz) and provides a data

rate of up to 11 Mbps. Effective throughput typically peaks at around 6 Mbps.

802.11g

802.11g is similar to 802.11b, but this forthcoming standard provides a data

rate of up to 54 Mbps. It also operates in the 2.4 GHz frequency band but

uses a different radio technology to boost overall bandwidth. Effective

throughput typically peaks at around 24 Mbps.

Access Point

An interface between a wireless network and a wired network. Access Points

can combine with a distribution system (such as Ethernet) to create multiple

radio cells (BSSs) that enable roaming throughout a facility.

Ad hoc mode

A wireless network composed of only stations and no Access Point.

Association service

An IEEE 802.11 service that enables the mapping of a wireless station to the

distribution system via an Access Point.

Asynchronous

transmission

A type of synchronization where there is no defined time relationship between

the transmission of frames.

Authentication

The process a station uses to announce its identity to another station.

IEEE 802.11 specifies two forms of authentication: open system and shared

key.

Bandwidth

The amount of transmission capacity available on a network at any point in

time. Available bandwidth depends on several variables such as the rate of

data transmission speed between networked devices, network overhead,

number of users, and the type of device used to connect devices to a

network.

Basic Service Set

(BSS)

A set of 802.11-compliant stations that operate as a connected wireless

network.

Bits per second

(bps)

A measurement of data transmission speed over communication lines based

on the number of bits that can be sent or received per second.

BSSID

Basic Service Set Identifier. A 48-bit identifier used by all stations in a BSS in

frame headers (usually the MAC address).

Clear channel

assessment

A function that determines the state of the wireless medium in an IEEE

802.11 network.

Client

Any computer connected to a network that requests services (files, print

capability) from another member of the network.

GLOSSARY

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