3com 3CRWE875075A User Manual
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need to consider AC power outlet locations. PoE support makes it easier than ever to
overcome installation problems with difficult-to-wire or hard-to-reach locations.
overcome installation problems with difficult-to-wire or hard-to-reach locations.
W
IRELESS
N
ETWORK
S
TANDARDS
Understanding the characteristics of the 802.11g and 802.11a standards can help you
make the best choice for your wireless implementation plans.
make the best choice for your wireless implementation plans.
F
AR
-R
EACHING
802.11
G
802.11g operates in the 2.4 GHz band at up to 54Mbps. Ratified in 2003, it supports
the widest coverage—up to 100 meters (328 feet). However, is subject to a greater risk
of radio interference because it operates in the more popular 2.4 GHz band.
the widest coverage—up to 100 meters (328 feet). However, is subject to a greater risk
of radio interference because it operates in the more popular 2.4 GHz band.
Consider 802.11g when you need wider coverage and vendor compatibility and you
are:
are:
n
Maintaining support for existing 802.11b users and the existing wireless
investment while providing for expansion into 802.11g.
investment while providing for expansion into 802.11g.
n
Implementing a complete wireless LAN solution, including bridges, gateways,
access points and clients; Wi-Fi certification guarantees compatibility
among vendors
access points and clients; Wi-Fi certification guarantees compatibility
among vendors
n
Providing access to hot spots in public spaces such as coffee shops or university
cafeterias
cafeterias
H
IGH
-P
ERFORMANCE
802.11
A
Ratified in 2002, 802.11a is IEEE’s more recent wireless standard. It operates at the 5
GHz band and supports data rates at up to 54 Mbps. For those organizations
demanding even higher speeds, a “turbo mode” feature can boost throughput rates up
to 108 Mbps. And 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.
GHz band and supports data rates at up to 54 Mbps. For those organizations
demanding even higher speeds, a “turbo mode” feature can boost throughput rates up
to 108 Mbps. And 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 meters (164 feet) of coverage—about half
what 802.11g offers.
what 802.11g offers.
Consider 802.11a when you need high throughput in a confined space and you are:
n
Running high-bandwidth applications like voice, video, or multimedia over a
wireless network that can benefit from a fivefold increase in data throughput
wireless network that can benefit from a fivefold increase in data throughput
n
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
documents or graphics files, such as MRI scans for medical applications, that
demand additional bandwidth