Internet and Intranet Connectivity Through Wireless Local Area Network (Wlan)
CHAPTER 1
Introduction
Chapter 1
Introduction
1.1 What is WLAN?
1.1.1 WLAN
Wireless Local Area Network (WLAN) is a kind of local area network which established using a wireless link between the service providers and the clients using some wireless equipment. This network development is based on the IEEE 802.11 standard.
1.1.2 IEEE 802.11
IEEE 802.11 denotes a set of Wireless LAN/WLAN standards developed by working group 11 of the IEEE LAN/MAN Standards Committee (IEEE 802). The term 802.11x is also used to denote this set of standards and is not to be mistaken for any one of its elements. There is no single 802.11x standard. The term IEEE 802.11 is also used to refer to the original 802.11, which is now sometimes called "802.11 legacy" [1]. The 802.11 family currently includes six over-the-air modulation techniques that all use the same protocol. The most popular techniques are those defined by the b, a, and g amendments to the original standard; security was originally included and was later enhanced via the 802.11i amendment. 802.11n is another modulation technique that has recently been developed; the standard is still under development, although products designed based on draft versions of the standard are being sold. Other standards in the family (c–f, h, and j) are service enhancements and extensions or corrections to previous specifications. 802.11b was the first widely accepted wireless networking standard, followed by 802.11a and 802.11g [1]. 802.11b and 802.11g standards use the 2.40 GHz (gigahertz) band, operating (in the United States) under Part 15 of the FCC Rules and Regulations. Because of this choice of frequency band, 802.11b and 802.11g equipment can incur interference from microwave ovens, cordless telephones, Bluetooth devices, and other appliances using this same band. The 802.11a standard uses the 5 GHz band, and is therefore not affected by products operating on the 2.4 GHz band.
Table 1.1: Protocol Summary of IEEE 802.11
Introduction
Chapter 1
Introduction
1.1 What is WLAN?
1.1.1 WLAN
Wireless Local Area Network (WLAN) is a kind of local area network which established using a wireless link between the service providers and the clients using some wireless equipment. This network development is based on the IEEE 802.11 standard.
1.1.2 IEEE 802.11
IEEE 802.11 denotes a set of Wireless LAN/WLAN standards developed by working group 11 of the IEEE LAN/MAN Standards Committee (IEEE 802). The term 802.11x is also used to denote this set of standards and is not to be mistaken for any one of its elements. There is no single 802.11x standard. The term IEEE 802.11 is also used to refer to the original 802.11, which is now sometimes called "802.11 legacy" [1]. The 802.11 family currently includes six over-the-air modulation techniques that all use the same protocol. The most popular techniques are those defined by the b, a, and g amendments to the original standard; security was originally included and was later enhanced via the 802.11i amendment. 802.11n is another modulation technique that has recently been developed; the standard is still under development, although products designed based on draft versions of the standard are being sold. Other standards in the family (c–f, h, and j) are service enhancements and extensions or corrections to previous specifications. 802.11b was the first widely accepted wireless networking standard, followed by 802.11a and 802.11g [1]. 802.11b and 802.11g standards use the 2.40 GHz (gigahertz) band, operating (in the United States) under Part 15 of the FCC Rules and Regulations. Because of this choice of frequency band, 802.11b and 802.11g equipment can incur interference from microwave ovens, cordless telephones, Bluetooth devices, and other appliances using this same band. The 802.11a standard uses the 5 GHz band, and is therefore not affected by products operating on the 2.4 GHz band.
Table 1.1: Protocol Summary of IEEE 802.11
References: 1. www.wikipedia.org 2. “Certified Wireless Network Administrator Official Study Guide”, Dreamtech Press, 3rd edition, pp. 33-43, 2005 3. T. S. Rappaport “Wireless Communications Principle and Practice”, Pearson Education, 2nd edition, 107-115, 2002 4. “Certified Wireless Network Administrator Official Study Guide”, Dreamtech Press, 3rd edition, pp. 171-200, 2005. 5. B. A. Forouzan, “Data Communication and Networking”, McGraw-Hill, 3rd edition, pp. 122-126 6. “Certified Wireless Network Administrator Official Study Guide”, Dreamtech Press, 3rd edition, pp. 74-97, 2005 7. “Certified Wireless Network Administrator Official Study Guide”, Dreamtech Press, 3rd edition, pp. 132-147, 2005 8. www.terabeam.com 9. User manual “APERTO” 10. User manual “CANOPY” 89