Wireless LAN

The Most Commonly Used Networking Technology WLAN - wireless technology that was developed in the 1980s. It is used to transmit data over the air (radio waves).

Wireless Networking uses two way Radio communications - Half Duplex Transmission.

Wireless Networking is referred to the technology & standard defined by IEEE. Since 1980, Wireless has improved, giving rise to different variations of the protocol:

IEEE - Institute of Electrical Electronics Engineers

The 802.11 family includes over-the-air modulation techniques that use the same basic protocol. The most popular are those defined by the 802.11b and 802.11g protocols, and are amendments to the original standard. 802.11-1997 was the first wireless networking standard, but 802.11b was the first widely accepted one, followed by 802.11g and 802.11n.

802.11a - This version operates on 5GHz at 54 Mbps speed. It is considered as the favorite wireless LAN protocol for IP telephony. The problem with it is distance; beyond 100 feet, you are out of the network.

Release date

Op. Frequency

Throughput (typ.)

Net Bit Rate (max.)

Gross Bit Rate (max.)

Max Indoor Range

Max Outdoor Range

October 1999

5 GHz

20 Mbit/s

54 Mbit/s

72 Mbit/s

~50 ft/15 meters

~100 ft/30 meters

802.11b - This version operates on 2.4GHz at 11 Mbps speed, but the distance of transmission is 300 feet, which is a considerable improvement over its predecessor. This version is used for public hotspots and small campus environments.

Release date

Op. Frequency

Throughput (typ.)

Net Bit Rate (max.)

Gross Bit Rate (max.)

Max Indoor Range

Max Outdoor Range

October 1999

2.4 GHz

~5 Mbit/s

11 Mbit/s

 ?? Mbit/s

~150 feet/45 meters

~300 feet/90 meters

802.11g - This version is relatively new and is considered as a high-speed replacement for 802.11b. It works on 2.4 GHz at 54 Mbps speed.

Release date

Op. Frequency

Throughput (typ.)

Net Bit Rate (max.)

Gross Bit Rate (max.)

Max Indoor Range

Max Outdoor Range

June 2003

2.4 GHz

~22 Mbit/s

54 Mbit/s

128 Mbit/s

~150 feet/45 meters

~300 feet/90 meters

802.11n - 802.11n is a recent amendment which improves upon the previous 802.11 standards by adding multiple-input multiple-output (MIMO) and many other newer features.

Release date

Op. Frequency

Throughput (typ.)

Net bit rate (max.)

Gross Bit Rate (max.)

Max Indoor Range

Max Outdoor Range

September 11, 2009

5 GHz and/or 2.4 GHz

50-144 Mbit/s

600 Mbit/s

 ?? Mbit/s

70 meters

250 meters

Using VoIP in a Wi-Fi Network - With the Wi-Fi 802.11 networks, you can engage in Internet Telephony by simply using your laptop or any type of computer equipped with a wireless interface card. You can use headphones and microphones or any other special phone provided by your VoIP service provider.

Standard and amendments

Within the IEEE 802.11 Working Group, the following IEEE Standards and Amendments exist:

 

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This site was last updated on - Monday, 28 December 2009