3Com 8200 Технічний паспорт - Сторінка 2

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3 C O M

W I R E L E S S L A N A C C E S S P O I N T S 8 2 0 0 / 8 5 0 0 / 8 7 0 0 D ATA S H E E T

Freedom of

movement, freedom

of choice

Implementing the

right standard for

your wireless

network needs

With their flexibility and unfettered

access, wireless LANs are changing

the way people work. Now with

3Com's enterprise-class wireless

access points, you can build a cost-

effective, reliable, secure wireless

network that provides users with

seamless connectivity to the Internet,

company intranet, and the wired

corporate network from anywhere

they happen to be—conference room,

cafeteria or office.

Understanding the characteristics of

the 802.11a and 802.11b standards

can help you make the best choice for

your wireless implementation plans.

Far-Reaching 802.11b

802.11b operates in the 2.4 GHz band

at 11 Mbps. Ratified in 1999, it's the

most widely deployed protocol in the

market today due to the Wi-Fi

Alliance's successful certification efforts

that have ensured interoperability. It

supports the widest coverage—up to

100 meters (328 feet). However, 802.11b

is slower than 802.11a and it is subject

to a greater risk of radio interference

because it operates in the more popular

2.4 GHz band.

Consider 802.11b when you need

wider coverage and vendor compati-

bility and you are

• Implementing a complete wireless

LAN solution, including bridges,

gateways, access points and clients;

Wi-Fi certification guarantees com-

patibility among vendors

• Managing a tight budget; 802.11b is

extremely price competitive with a

wide range of vendors and price

points

• Providing access to hot spots in

public spaces such as coffee shops

or university cafeterias

• Running applications that don't

require high bandwidth

3Com's dual-mode design supports

both 802.11a and 802.11b wireless

standards on a single access point.

This capability increases configuration

and coverage flexibility and protects

your network investment for both

existing and emerging wireless stan-

dards. Industry-leading security

features and comprehensive manage-

ment and performance features

combine to make these enterprise-

class wireless access points an ideal

choice for organizations ready to serve

their increasingly mobile workforce.

High-Performance 802.11a

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 organiza-

tions 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 802.11b.

The higher spectrum provides about

50 meters (164 feet) of coverage—about

half what 802.11b offers.

Consider 802.11a when you need high

throughput in a confined space and

you are

• Running high-bandwidth applica-

tions like voice, video, or

multimedia over a wireless network

that can benefit from a fivefold

increase in data throughput

• Transferring large files like com-

puter 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 access

points in a tighter space