wireless network standards 802.11b, 802.11g, and 802.11a differences


Wireless networks use radio waves to send information between computers. The three most common wireless network standards are 802.11b, 802.11g, and 802.11a. A new standard, 802.11n, is expected to grow in popularity.

Speed
802.11b: transfers data at a maximum rate of 11 megabits per second (Mbps). Downloading a 10 megabyte (MB) photo from the Internet under optimal conditions takes about 7 seconds.

802.11g: transfers data at a maximum rate of 54 Mbps. Downloading a 10 megabyte (MB) photo from the Internet under optimal conditions takes about 1.5 seconds.

802.11a: transfers data at a maximum rate of 54 Mbps. Downloading a 10 megabyte (MB) photo from the Internet under optimal conditions takes about 1.5 seconds.

802.11n: depending upon the number of data streams the hardware supports, 802.11n can theoretically transmit data at up to 150 Mbps, 300 Mbps, 450 Mbps, or 600 Mbps.

Note
The transfer times listed are under ideal conditions. They aren't necessarily achievable under normal circumstances because of differences in hardware, web servers, network traffic conditions, and so on.

Pros
 It's easy to move computers around because there are no cables.

Wireless networks are usually easier to install than Ethernet.

Cons
 Wireless is often slower than the other three technologies.

Wireless can be affected by interference from things such as walls, large metal objects, and pipes. Also, many cordless phones and microwave ovens can interfere with wireless networks when they're in use.

Wireless networks are typically about half as fast as their rated speed under all but ideal conditions.


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