Networking - Networking Basics - Discussion

WLAN: Wireless LAN by IEEE 802.11, 802.11a, 802.11b, 802.11g, 802.11n

The Wireless Local Area Networl (WLAN) technology is defined by the IEEE 802.11 family of specifications. There are currently four specifications in the family: 802.11, 802.11a, 802.11b, and 802.11g. All four use the Ethernet protocol and CSMA/CA (carrier sense multiple access with collision avoidance instead of CSMA/CD) for path sharing.

802.11 -- applies to wireless LANs and provides 1 or 2 Mbps transmission in the 2.4 GHz band using either frequency hopping spread spectrum (FHSS) or direct sequence spread spectrum (DSSS).

802.11a -- an extension to 802.11 that applies to wireless LANs and provides up to 54 Mbps in the 5GHz band. 802.11a uses an orthogonal frequency division multiplexing (OFDM) encoding scheme rather than FHSS or DSSS. The 802.11a specification applies to wireless ATM systems and is used in access hubs.

802.11b (also referred to as 802.11 High Rate or Wi-Fi) -- an extension to 802.11 that applies to wireless LANS and provides 11 Mbps transmission (with a fallback to 5.5, 2 and 1 Mbps) in the 2.4 GHz band. 802.11b uses only DSSS. 802.11b was a ratification to the original 802.11 standard, allowing wireless functionality comparable to Ethernet.

802.11g -- offers wireless transmission over relatively short distances at 20 - 54 Mbps in the 2.4 GHz band. The 802.11g also uses the OFDM encoding scheme.

802.11n -- builds upon previous 802.11 standards by adding MIMO (multiple-input multiple-output). IEEE 802.11n offers high throughput wireless transmission at 100Mbps – 200 Mbps.

802.11 provide 2 mbps at 2.4Gh.
802.11a provides 54 mbps at 5Ghz.
802.11b provides 11 mbps at 2.4Ghz.
802.11g provides 54 mbps at 2.4Ghz.
802.11n 100 mbps - 200mbps.

@Aniley Belayneh.

Thanks for this clear explanation.

What is G? Explain Please.

Why we using a G n instead of a b c d?

IEEE - Institute of Electrical & Electronics Engineering.

What is the expansion of IEEE?

802.11 is a set of IEEE standards that govern wireless networking transmission methods. They are commonly used today in their 802.11a, 802.11b, 802.11g, 802.11n and 802.11ac versions to provide wireless connectivity in the home, office and some commercial establishments.

What is G? please explain.

What is mean by G?