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Wireless LAN
Comparison between IEEE 802.11a/b/g standards

 
802.11b 802.11a 802.11g
Up
- High popularity
- Available everywhere
- High Range
(~100-150 feet indoors)
- Compatible with 11g

 

- High throughput
- Many non overlapping channels available
- 5Ghz is an uncrowded band
- 5Ghz can coexist with applications operating at 2.4Ghz (Bluetooth, microwave oven cordless phone etc…) without any interference
- Suitable for multimedia applications
- High throughput
- High Range (~100-150 feet indoors)
- Compatible with 11b
 Down
- Low throughput
- 2.4Ghz band is more crowded than the 5Ghz.
- Interferences
with devices operating at 2.4Ghz (microwave oven, cordless
phone etc...) can occur
- Not suitable for multimedia application
- Less diffusion
- Low range
- Not compatible with 11b and 11g
- 2.4Ghz band is more crowded than the 5Ghz. Interferences with devices operating at 2.4Ghz (microwave oven, cordless phone etc…) can occur
- Less suitable than 11a std for multimedia application
 
The 802.11b standard has already gained a good deal of ground in the enterprise environment, in public locations such as airports, coffee shops, business centers and hotels, and increasingly in the home.

Later the evolution towards the 802.11g opened the doors to application requiring higher performances, guarantying 802.11b back compatibility at the same time.

Unfortunately 802.11b and 802.11g operate in a crowded band and this impact on Multimedia Applications which, requiring QoS (Quality of Service), suffer in such environment.

That's move the attention to the 802.11a.
802.11a supports the same 802.11g data rates and it enables multimedia applications for WLAN operating in an uncrowded band and having more non-overlapping channels.

For these reasons ST addressed an a/b/g solution able to support simultaneously all this standards and developed the Band Interleaving Technology.