Telecommunications Sensors

Download Wireless Lan Communications by IBM Redbooks PDF

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Although some of these products share common functions and features, there are differences in capability which makes each suitable to different areas of deployment. These wireless LAN products are enabling technologies. Their fundamental purpose is to provide a radio interface and appropriate device drivers to common communication protocols such as TCP/IP, NetBIOS and IPX. The radio component of the LAN is totally transparent to applications using these protocols. To the end user, an application works exactly the same way as it would on a conventional wired LAN such as Ethernet or token-ring.

4 GHz band. They operate in a point-to-point mode which is to say that any pair of stations will talk directly to each other without having to go through an intermediate device. See Figure 2. Figure 2. The Stand-Alone Cell. Workstations 2, 3 and 4 communicate in point-to-point mode and not through the cell-leader. They communicate with the cell-leader for information about the cell. 1 The Cell-Leader One and only one station in the stand-alone cell must be configured to be a cell-leader. 4 GHz RF band is divided up into a number of sub-bands or frequency channels.

IBM Wireless Products 15 any cell, one workstation is configured as a cell leader whose responsibility it is to dictate what frequency channels are to be used within the cell and in what order. It also provides authorization functions for the workstations in the cell. Multiple overlapping cells can exist without generally interfering with each other′s operation, unless the workstation density becomes significantly high. Such overlapping is transparent to individual workstations, as they only communicate with members of their own cell.

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