Wi-Fi

WiFi Network

Wi-Fi is stands for wireless fidelity. Wi-Fi uses the 802.11 standard; it was developed by the Institute of Electrical and Electronics Engineers (IEEE) in 1997. Wi-Fi was superseded by the extensions 802.11a and 802.11b, and later by 802.11g. Wi-Fi technology uses radio communication and operating at a frequency of 2.4GHz. [v]
What are IEEE 802.11 standards?
Ans. 802.11 is the original wireless local area networks standard. It supports 1 Mbps to 2 Mbps. 802.11a is a very high speed wireless local area networks standard for 5 GHz band and it supports 54 Mbps. It uses an orthogonal frequency division multiplexing (OFDM) encoding scheme. 802.11b is a wireless standard for 2.4 GHz band. It supports 11 Mbps. 802.11b uses only DSSS( Direct Sequence Spread Spectrum). 802.11d is a international roaming. This automatically configures devices to meet local RF regulations. 802.11e address the quality of service requirements for all IEEE wireless radio interfaces. 802.11f defines inter-access point communications to facilitate multiple vendor-distributed wireless local area networks. 802.11g establishes an additional modulation technique for 2.4 GHz band. This supports speeds up to 54 Mbps. 802.11h defines the spectrum management of the 5 GHz band. 802.11i address the current security weaknesses for both authentication and encryption protocols. 802.11n provides higher throughput improvements. It also provides speeds up to 500 Mbps.

Advantages

· fast maximum speed
· regulated frequencies prevent signal interference from other devices
· lowest cost
· signal range is good and not easily obstructed
· fast maximum speed
· signal range is good and not easily obstructed

Dis-advantages

· highest cost
· shorter range signal that is more easily obstructed
· slowest maximum speed
· home appliances may interfere on the unregulated frequency band
. costs more than 802.11b
· appliances may interfere on the unregulated signal frequency