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588 Chapter 22
coming in a distant third. The most common protocol, particularly for home users, has
been 802.11b; however, 802.11g is becoming the default standard because of its increased
speed and compatibility with existing 802.11b networks. The following is a brief
overview of the different protocols:
22.2.1 802.11b
Wireless network equipment built on the 802.11b protocol was the first to really take
off commercially. 802.11b offers transmission speeds up to 11 mbps, which compares
favorably with standard Ethernet networks—plus, the equipment is relatively inexpensive.
One problem for this protocol is that it uses the unregulated 2.4 GHz frequency range,
which is also used by many other common household items such as cordless phones and
baby monitors. Interference from other home electronics devices may degrade or prevent
a wireless connection.
22.2.2 802.11a
The 802.11a protocol uses a regulated 5 GHz frequency range, which is one contributing
factor for why 802.11a wireless equipment is significantly more expensive than its
counterparts. 802.11a offers the advantage of transmission speeds of up to 54 mbps;
however, the increased speed comes with a much shorter range and more difficulty
traversing obstructions, such as walls, due to the higher frequency range.
22.2.3 802.11g
The 802.11g protocol has emerged as the new standard at this time. It combines the best
aspects of both 802.11b and 802.11a. It has the increased transmission speed of 54 mbps
like 802.11a, but uses the unregulated 2.4 GHz frequency range, which gives it more
range and a greater ability to go through walls and floors, and also helps keep the cost of
the equipment down. 802.11g is also backwards-compatible with 802.11b, so computers
with 802.11b wireless network adapters are still able to connect with 802.11g routers or
access points.
22.2.4 Next-Generation Protocols
Wireless networking is relatively new and constantly evolving. A number of new
protocols are currently being developed by the wireless industry, such as WiMax,
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