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Some of the aforementioned applications have already been evaluated and some have indeed been implemented using the existing wireless infrastructure. However, in most cases, the technicians were faced with the unresolvable issue of connectivity. In other cases, a network for providing a connection was available but simply was not designed for data applications. These required the development of an entirely new protocol stack. With regard to the upcoming high speed mobile data services, well-known and well-understood protocol stacks such as IP may be used to develop the applications.
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