Mitsubishi Electronics A111 Ieee 802.11b 11Mbits/sec, Ieee 802.11g, Infrastructure, IP Address

Chapter 5 - Glossary

IEEE 802.11b (11Mbits/sec)

In1997,theInstituteofElectricalandElectronicsEngineers(IEEE)adoptedthe802.11 standard for wireless devices operating in the 2.4 GHz frequency band.This standard includes provisions for three radio technologies: direct sequence spread spectrum, frequencyhoppingspreadspectrum,andinfrared.Devicesthatcomplywiththe802.11 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

802.11standard except 802.11b provides for data rates of up to 11 Mbps for direct sequencespreadspectrumdevices.Under802.11b,directsequencedevicescanoperate at 11 Mbps, 5.5 Mbps, 2 Mbps, or 1 Mbps. This provides interoperability with existing

802.11directsequencedevicesthatoperateonlyat2Mbps.

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 into14overlappingoperatingChannels.EachChannelcorrespondstoadifferentsetof 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 rangeandpresenceofobstructions.

Infrastructure

A wireless network centerd 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.

IP (Internet Protocol)

The TCP/IP standard protocol that defines the IP datagram as the unit of information passed across an Internet and provides the basis for connectionless packet delivery service. IP includes the ICMP control and error message protocol as an integral part. It provides the functional equivalent of ISO OSI Network Services.

IP Address

An IP address is a 32-bit number that identifies each sender or receiver of information that is sent across the Internet.An IP address has two parts: the identifier of a particular network on the Internet and an identifier of the particular device (which can be a server or a workstation) within that network.

ISP (Internet Service Provider)

An organization that provides access to the Internet. Small ISPs provide service via modem and ISDN while the larger ones also offer private line hookups (T1, fractional T1, etc.).

Chapter 5 Glossary

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