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Wi-Fi controller can be used for Door access control system and time clock system,
It's very high end technology on security industry, like Wifi ,GPRS and modem.,etc
This is a great and very common question, and one that I hear at least every week. It's also important to understand the answer, as controller implementation serves as a primary differentiation in enterprise-class systems (the other being management features). Let's start with the big picture. The purpose of a WLAN system is of course to move data in essentially the same manner as a wired LAN. But there's a much higher degree of variability in the architecture of WLAN systems and solutions, and we therefore have developed a model, based on the concept of planes, to describe the internal functions of a given WLAN architecture. These planes are as follows:
We can probably agree that the Data Plane should be as distributed as possible, and that the Management Plane must be centralized. So it's the Control Plane that presents the greatest opportunity for controversy, as it can be fully distributed and implemented in an AP, reside in a server, or, again, live in a separate box, the controller. While vendor arguments are plentiful and often persuasive, there's not enough empirical (based on appropriate benchmarks) or analytical (the results of mathematical models of system behavior given specific configuration and loading) to provide a definitive argument either way. One can certainly make the argument that a controller adds cost (and that additional or redundant controllers may be required to handle certain loads and/or provide fault tolerance), but one must consider the total cost of a given solution, not the cost of individual elements. And one can make the argument that a controller-based implementation provides a more global view of system condition and behavior, and thus could yield higher performance especially over time – but, again, there are no definitive studies (yet) one way or the other. The degree of architectural diversity around this question is indeed significant, and we expect to see additional architectural variability before any definitive solution is recognized as such. Do you need a controller? Much depends upon what your supplier proposes. Careful analysis of the arguments presented by vendors during the purchasing process and appropriate benchmarking tests based on local requirements are the only guides at present.