Linksys Network Card WRE54G User Manual

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Appendix A: Troubleshooting
Frequently Asked Questions
Wireless-G Range Expander
•Multi-Channel Roaming
•Automatic Rate Selection
•RTS/CTS feature
•Fragmentation
•Power Management
What is Ad-hoc?
An Ad-hoc wireless network is a group of computers, each with a wireless adapter, connected as an
independent wireless network. An Ad-hoc wireless network is applicable at a departmental scale for a branch
or SOHO operation.
What is Infrastructure?
An integrated wireless and wired network is called an Infrastructure configuration. Infrastructure is
applicable to enterprise scale for wireless access to a central database, or wireless application for mobile
workers.
What is Roaming?
Roaming is the ability of a portable computer user to communicate continuously while moving freely
throughout an area greater than that covered by a single access point. Before using the roaming function, the
workstation must make sure that it is the same channel number as the network within the coverage area.
To achieve true seamless connectivity, the wireless network must incorporate a number of different functions.
Each node, for example, must always acknowledge receipt of each message. Each node must maintain
contact with the wireless network even when not actually transmitting data. Achieving these functions
simultaneously requires a dynamic RF networking technology that links nodes. In such a system, the user’s
end node undertakes a search for the best possible access to the system. First, it evaluates such factors as
signal strength and quality, as well as the message load currently being carried in the network. Based on that
information, the node next selects the right access point and registers its address. Communications between
end node and host computer can then be transmitted up and down the backbone.
As the user moves on, the end node’s RF transmitter regularly checks the system to determine whether it is in
touch with the original access point or whether it should seek a new one. When a node no longer receives
acknowledgment from its original access point, it undertakes a new search. Upon finding a new access point,
it then re-registers, and the communication process continues.
What is ISM band?
The FCC and their counterparts outside of the U.S. have set aside bandwidth for unlicensed use in the ISM
(Industrial, Scientific and Medical) band. Spectrum in the vicinity of 2.4 GHz, in particular, is being made
available worldwide. This presents a truly revolutionary opportunity to place convenient high speed wireless
capabilities in the hands of users around the globe.

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