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Wi-Fi and Wireless Discussion Forums > What is Wi-Fi Technology > 802.11a and 802.11b channels

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zillah

Junior Member

Posts: 12
Registered: 1/10/05
Status: Offline

posted on 19/8/06 at 05:14

While I was trying to refresh my knowledge about these three standards (802.11a, 802.11b, 802.11g), I found this :

1-

code:
searchnetworking.techtarget.com/sDefinition/0,,sid7_gci993747,00.html

quote:
There is less interference with 802.11a than with 802.11b, because 802.11a provides more available channels

code:
en.wikipedia.org/wiki/802.11

quote:
required. 802.11a has 12 non-overlapping

code:
www.networkworld.com/columnists/2003/1020wizards.html

quote:
802.11b access point with a total of 11 channels

code:
www.cisco.com/univercd/cc/td/doc/product/wireless/airo1200/accsspts/ap120sc
g/bkscgaxa.htm

With these two tables we have got :
1- 802.11a 16 channels

2- 802.11b 14 channels

5- I read in some documentation long time ago:

quote:
The 802.11 b/g standard defines a total of 14 frequency channels. The FCC allows channels 1 through 11 within the U.S.; whereas, most of Europe can use channels 1

through 13. In Japan, you have only one choice: channel 14. 802.11g is fundamentally the same as 802.11b, except it is designed for higher throughput

Why there are a difference with the numbers of channels for a specific standard ? Is this related to overlap and non-overlap ?

Thanks