Wireless-G Access Point with SRX
What IEEE 802.11g features are supported?
The product supports the following IEEE 802.11g functions:
•CSMA/CA plus Acknowledge protocol
•OFDM protocol
•
•Automatic Rate Selection
•RTS/CTS feature
•Fragmentation
•Power Management
What is Ad-hoc?
An
What is Infrastructure?
An integrated wireless and wired LAN 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 to communicate continuously while its user is moving freely throughout an area greater than that covered by a single Access Point. Before using the roaming function, the user must make sure that the computer is set to the same channel number as the Access Point of the dedicated coverage area.
To achieve true seamless connectivity, the wireless LAN must incorporate a number of different functions. Each node and Access Point, 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 Access Points and 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 by each Access Point and the distance of each Access Point to the wired backbone. 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
Appendix A: Troubleshooting | 36 |
Frequently Asked Questions
