Asus WL-320gE User Manual download pdf (Page 55)

5. Appendix

ASUS 802.11g Access Point 55

Chapter 5 - Appendix

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 specication 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 proposed (to be nalized) 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 trafc in the immediate neighborhood.

IP (Internet Protocol)

The TCP/IP standard protocol that denes 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 identies each sender or receiver of

information that is sent across the Internet. An IP address has two parts: the

identier of a particular network on the Internet and an identier of the particular

device (which can be a server or a workstation) within that network.

ISM Bands (Industrial, Scientic, and Medicine Bands)

Radio frequency bands that the Federal Communications Commission (FCC)

authorized for wireless LANs. The ISM bands are located at 902 MHz, 2.400 GHz,

and 5.7 GHz.

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.).

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Asus WL-320gE User Manual Page 55