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Appendix A
Wireless LAN and IEEE 802.11
A wireless LAN (WLAN) provides a flexible data communications system that you can use to access various services (navigating the Internet, email, printer services, etc.) without any expensive network cabling infrastructure. In effect a wireless LAN environment provides you the freedom to stay connected to the network while in the coverage area.
Benefits of a Wireless LAN1.Access to network services in areas otherwise hard or expensive to wire, such as historical buildings, buildings with asbestos materials and classrooms.
2.Doctors and nurses can access a complete patient’s profile on a handheld or notebook computer upon entering a patient’s room.
3.It allows flexible workgroups a lower total cost of ownership for networks that are frequently reconfigured.
4.Conference room users can access the network as they move from meeting to meeting- accessing
5.It provides
The 1997 completion of the IEEE 802.11 standard for wireless LANs (WLANs) was a first important step in the evolutionary development of wireless networking technologies. The standard was developed to maximize interoperability between differing brands of wireless LANs and to introduce a variety of performance improvements and benefits. On September 16, 1999, the 802.11b provided much higher data rates of up to 11Mbps, while maintaining the 802.11 protocol.
The IEEE 802.11 specifies three different transmission methods for the PHY, the layer responsible for transferring data between nodes. Two of the methods use spread spectrum RF signals, Direct Sequence Spread Spectrum (DSSS) and
The simplest WLAN configuration is an independent
Wireless LAN and IEEE 802.11 | A |