NETGEAR WGR101, Справочное руководство

Страница: 103 / 123

Wireless Networking Basics D-1
February 2005 (202-10034-03)
Appendix D
Wireless Networking Basics
Wireless Networking Overview
The WGR101 wireless travel router conforms to the Institute of Electrical and Electronics
Engineers (IEEE) 802.11g standard for wireless LANs (WLANs). On an 802.11 wireless link, data
is encoded using direct-sequence spread-spectrum (DSSS) technology and is transmitted in the
unlicensed radio spectrum at 2.5GHz. The maximum data rate for the 802.11g wireless link is 54
Mbps, but it will automatically back down from 54 Mbps when the radio signal is weak or when
interference is detected.
The 802.11 standard is also called Wireless Ethernet or Wi-Fi by the Wireless Ethernet
Compatibility Alliance (WECA, see
http://www.wi-fi.net ), an industry standard group promoting
interoperability among 802.11 devices. The 802.11 standard offers two methods for configuring a
wireless network - ad hoc and infrastructure.
Infrastructure Mode
With a wireless access point, you can operate the wireless LAN in the infrastructure mode. This
mode provides wireless connectivity to multiple wireless network devices within a fixed range or
area of coverage, interacting with wireless nodes via an antenna.
In the infrastructure mode, the wireless access point converts airwave data into wired Ethernet
data, acting as a bridge between the wired LAN and wireless clients. Connecting multiple access
points via a wired Ethernet backbone can further extend the wireless network coverage. As a
mobile computing device moves out of the range of one access point, it moves into the range of
another. As a result, wireless clients can freely roam from one access point domain to another and
still maintain seamless network connection.