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文章阅读:wrieless primer for notebook users
[版面: 电子工程] [作者:qfcao] , 2000年11月23日08:05:07
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发信人: qfcao (离离@草), 信区: EE
标  题: wrieless primer for notebook users
发信站: The unknown SPACE (Thu Nov 23 08:05:22 2000), 转信


Wireless Primer for Notebook Users

Notebook computers are the ultimate portable computing tool. But add in
extra drives, batteries, and all the other accessories that go along
with today's mobile devices, and pretty soon you'll find yourself
packing a bag full of cables, adapters, and accessory cards to go along
with all this. And that can weigh you down pretty quickly. Today's
wireless technologies can help untangle that cable mess so you can
travel with less junk and make wireless connections quickly and easily.

There are three levels of wireless connectivity currently available for
notebook users: PAN (Personal Area Network), LAN (Local Area Network),
and WAN (Wide Area Network). Each type of wireless network operates
differently, and serves different needs of notebook users. So if you're
looking for a wireless solution, the first step is to find the option
that best meets your needs.

Until now, wireless PAN products have been limited to infrared
connections, which are typically good for exchanging data in the line of
site, no more than 10 feet away. But with Bluetooth technology beginning
to emerge in notebooks, add-on modules, and other devices, notebook
users will be able to transfer data wirelessly at up to 1 Mbps between
devices located up to 30 feet away. Bluetooth connections between
notebook PCs, PDAs, digital cameras, printers, phones, speakers,
keyboards and pointing devices, external monitors, and storage devices
promise to make our digital lives easier when we want to transfer files,
print documents or images, or synchronize data between devices.

LANs have long been common in offices and are more recently being
installed in homes for file transfer, printer sharing, and especially
shared Internet access. Wireless LAN technologies available today
include variants of the standard called 802.11, which supports transfer
rates from 2 Mbps to 11 Mbps, and HomeRF (Home Radio Frequency), which
supports transfer rates up to 1.6 Mbps.

The appeal of a wireless LAN is pretty obvious when you consider the
difficulty and expense of laying cable and using Ethernet to wire your
home or small office. You can carry your networked notebook to meetings
or around your home and share files, printers, and Internet access when
you're connected to the LAN. Typically with wireless LANs, you can be up
to 150 or 200 feet away from an access point -- a device that transfers
data throughout the network -- and still access other devices on the
network. And while the cost of wireless networks might have hindered
sales in the past, the prices of wireless LANs have recently become much
more affordable.

WAN access for notebooks is typically used by mobile workers who need to
connect to the Internet, remotely access a company network server, or
connect to specialized information such as messaging, e-mail, or paging
services while traveling. If you need to communicate using your PC while
you're away from your office or home without relying on a telephone or a
LAN connection, look for a wireless WAN option. The range of WANs
depends on the technologies used -- some work in most metropolitan areas
throughout the U.S. but others are for particular regions only.

Whether you opt for PAN, LAN, WAN, or any combination of the three
technologies, the bottom line is staying connected to the devices,
information, and services you need without carrying cables or searching
for the right kind of port or connection jack. For more details on
wireless technologies and products, including hands-on reviews, check
out ZDNet's Wireless center.


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