The Design And Realization Of Program-controlled Digital Machine Scheduling, Small Gate Count

Digital switchs are playing an extremely importantrole in voice communication. While commom large volume digital switch systems provide basic voice services, special digital switches are often undertaking critical coordination tasks in some special units, such as police, fire-fighting departments, medical emergency services, factories and ore fields, as well as power systems. These dedicated exchangers used to execute coordination are commonly called Digital Programmable Coordinator (DPC). The small volume DPC'S introduced in this article are majorly used in power systems. With the common applications of communication and computer technology, most transformer substations in power systems have accomplished No-Human-On-Duty functionality. As a consequence, small volume, highly reliable and low cost DPCs with new features are in greater demand. Due to wide-spreading of new technologies in recent years, previously high cost technologies are commonly applied in small and middle size system designs now. Such a reality makes it possible to implement a small volume, high quality and low cost DPCs. This article uses CPLD technology to improve the hardware integration degree so as to ensure the high system reliability; it applies digital signal process technology to producing and recognizing large volume ditigal voice signals in switch systems; it replaces the old-used special voice signal process chips, thus lowers the cost, improves the quality; it uses high quality common PC 104 units to complete the main processor tasks, which greatly improves the signal processing capability in the digital switch systems, and provides a great convinence for future technology upgrade as well; in system archtecture, we exploit modular design technique on client ports and repeater ports, which gains more reliability and easy maintenance.