The battle of the wireless standards continues to rage. 802.11g shares the same frequency band as the 11mbps 802.11b networking protocol at 2.4GHz, whereas 802.11a is in a new and much higher band at 5GHz. The European Union at first banned any networks from this band apart from the Hiperlan II standard, despite a complete lack of products: this restriction is still in place, but by making 802.11a a nominal member of the Hiperlan family of standards, the law has been bypassed. The one remaining problem is that some European states want to restrict the power and frequencies used because of existing services: a modification to the standard, 802.11h, incorporates this and is expected to be approved by the end of the year, Doctor said. 802.11g is not expected to be approved until 2003. Dealing with interference
Because 2.4GHz is better at penetrating walls and ceilings than 5GHz, some commentators have said that 802.11g will have better range and throughput in practice than 802.11a. However, the modulation method used for 802.11g is better at coping with reflections that would otherwise interfere with the signal, Doctor said, and some materials are more absorbent at the lower frequency. In particular, 2.4GHz is close to the frequency that water is best at absorbing -- which is why microwave ovens operate at that frequency -- so in many circumstances 5GHz will in fact cope better. Also, 802.11a has eight channels to 802.11g's three, so can cope with a higher density of users without interference. Making 802.11g part of the solution
Doctor predicted that 802.11g will only make sense as part of a dual-band, tri-mode solution: access points capable of operating at 2.4GHz and 5GHz simultaneously on all three wireless standards. On the way to that, Intel will be driving a transition to dual-mode, dual-band 802.11a and 802.11b products, much as it did with 10baseT wired Ethernet from 10mbps to 10/100mbps. Dual-band access points will be available in the US in the first quarter of 2002, he said, with clients following in Q3. He pointed out that once such products exist, adding a third protocol such as 802.11g to one of the supported bands would be effectively free to the manufacturers, so this could happen as soon as the standard is approved. In the future, he predicted more bandwidth -- especially as gigabit wired Ethernet gets to the desktop -- better manageability and better security would be the focus of new standards.
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