Abstract
In the BTL-developed High Capacity Mobile Telecommunications System, a digital controller within the mobile Logic Unit allows mobiles to communicate with Cell Sites by means of a high-speed radio data link, and interacts with the user via switches and displays. This paper presents an overview of the controller. The switching and control functions that it performs and digital messages involved are first briefly described. This is followed by a description of its hardware design that exploits a microprocessor as the central processing unit.

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