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Along with the rapid development of ARM embedded technology, high-performance processor chips and network technology, digital and networked visible interphone system in district becomes possible.In this thesis, for the deficiency of simulation technology in the visible interphone system, a scheme of the design and implementation of the digital intelligent terminal system is put forward, based on multimedia applications processor Z228 (ARM926EJ kernel), embedded Linux and TCP/IP technology.First, a scheme of the overall design of doorstation in the digital intelligent terminal system is put forward.The function requirement is analysed, scheme of the software and hardware platform are designed, and the flowchart of overall design of the doorstation is expounded. Second, the embedded linux system is transplanted, including the cutting and transplantation of u_boot, embedded linux kernel and file system in Z228 target board. Third, hardware circuit of terminal module including keyboard, display, voice etc.is designed, and the program of the this module is designed based on the serial communication technologyunder Linux. Fourth, Communication between doorstation and indoor-machine is designed, which includes the desigen of communication protocol, realization of command frame and design of Socket communication based on TCP. Fifth, the application functional module of doorstation of intelligent terminal system is designed, including the visible interphone, image and voice record, unlocking by password and monitoring etc.function.The results of test on functions of doorstation show that the design is feasible, and the functions of visible interphone, image and voice record, unlocking by password and monitoring etc. have been realized. It basically meets the need of visible interphone system, can solve problems which the mechanism of transport in the traditional bus system is difficult to solve, and make the system directly access the network. It is simple for wiring。
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