Wireless Network Standards - 3Com 3CRWE675075 - 11a/b/g Wireless LAN Workgroup Bridge User Manual

6 C
HAPTER
Wireless Network
Standards
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1: I
NTRODUCTION
Understanding the characteristics of the 802.11a and 802.11g standards
can help you
802.11a
Ratified in 2002, 802.11a is IEEE's more recent wireless standard. It
operates at the 5
Because there are fewer devices in the 5 GHz band, there's less potential for
RF interference. However, because it is at an entirely different radio
spectrum, it is not compatible with 802.11g.
The higher spectrum provides about 50 m (164 ft) of coverage—about
half what 802.11g offers.
Consider 802.11a when you need high throughput in a confined space
and you are:
Running high-bandwidth applications like voice, video, or multimedia
■
over a wireless network that can benefit from a five-fold increase in
data throughput.
Transferring large files like computer-aided design files, preprint
■
publishing documents or graphics files, such as MRI scans for medical
applications, that demand additional bandwidth.
Supporting a dense user base confined to a small coverage area.
■
Because 802.11a has a greater number of non-overlapping channels,
you can pack more wireless devices in a tighter space.
802.11g
802.11g operates in the 2.4 GHz band at up to 54 Mbps. Ratified in
2003, it supports
subject to a greater risk of radio interference because it operates in the more
popular 2.4 GHz band.
802.11b operates at up to 11 Mbps and supports coverage up to 100 m
(328 ft).
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make the best choice for your wireless implementation plans.
GHz band and supports data rates at up to 54 Mbps.
the widest coverage—up to 100 m (328 ft). However, is