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Integrated Services Digital Network (ISDN) is a set of international standards developed to provide end-to-end digital communication over the traditional public switched telephone network. Unlike the earlier analog telephone system, ISDN enables the transmission of voice, data, video, and other services simultaneously over the same line using digital signals. It was designed to improve the quality, speed, and reliability of communication by integrating multiple services into a single network infrastructure. ISDN uses circuit-switched connections, ensuring a dedicated path for the _________ ______ ______ _________ _________ __________.
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