Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Microwave transmission wikipedia , lookup
Wireless USB wikipedia , lookup
Power over Ethernet wikipedia , lookup
List of wireless community networks by region wikipedia , lookup
Cracking of wireless networks wikipedia , lookup
Piggybacking (Internet access) wikipedia , lookup
Policies promoting wireless broadband in the United States wikipedia , lookup
IEEE 802.11x WiFi Protocol Contents Terminology Explained 802.11 Technical Underpinnings 802.11 Deployment Concluzione! 801.11 Terminology Explained Sounds like HiFi (marketable). The WiFi denotation is essentially the branding of certified 802.11 equipment to allow interoperability between different manufacturers of 802.11 ‘wireless’ equipment! IEEE 802.11 Terminology Expl. IEEE stands for the Insititute for Electrical and Electronics Engineers, it is a multinational coalition for standardisation and quality certification. IEEE 802 is the established standard for LAN/MAN. The number 802 was conveniently chosen because of its numerical availability after 801. IEEE 802.11 deals specifically with wireless networking as opposed to ‘wired’ networking and the Ethernet 802.3 standard. 802.11 Technical Underpinnings 802.11 is spread via Radio Frequency technology. Digital data signals are modulated by your computer and then transmitted, to be received with an inverse operation. 802.11 typically utilises the ‘open’ ISM 2.4+-GHz and 5.7+-GHz frequency bands to transmit its signals. Because these frequency ranges are ‘unallocated’, bandwidth for WLAN is shared with bluetooth devices, microwave ovens and cordless phones amongst other things. The maximum power gain on 802.11 is regulated by the ACMA and is currently restricted to 36dB or 4W combined total. Radio Frequency Spectrum 802.11 Underpinning Cont… 802.11 legacy has been standardised over the years with three major amendments, 802.11b, 802.11g and 802.11a! With each standard, beginning with B the first standard, amendments were made to the choice of Modulation Technology, Maximum Data Throughput and effective range. 802.11 Data Sheet! Deployment Wireless implementation primarily deals with two important standards the BSS and the IBSS. All other forms are derivations of these principles. The BSS is your traditional Client-Server model whereby Person A can connect to Person C ONLY via a direct connection to Person B. In this example person B is termed the server and persons A & C the clients; in a wireless scenario person B would be some sort of Access Point. The IBSS is a more intuitive and logical approach, whereby any one person can connect to another, whether or not a provider exists to bridge the connections. BSS/Infrastructure Mode IBSS/Mesh-Networking/P2P Concluzione! Wireless is useful for consumer-grade applications. Wireless can be cost-effective. Wireless however cannot compare to the performance achieved with wires. Wireless still has yet to address key issues of interference and prolonged signal propagation. Bibliography http://www.acorn.net.au/report/adhocnetworks/adhocnet.gif http://www.mpirical.com/companion/UMTS/BSS.gif http://www.ieee.org/portal/cms_docs/education/setf/cases/mul timodephone/images/mmpw-usaspect1.jpg http://www.acma.gov.au/WEBWR/radcomm/frequency_planni ng/spps/0001spp.pdf http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci 993747,00.html http://www.dalewright.net/wpcontent/uploads/2006/11/broadcom-table1.gif