Integrated Services Digital Network (ISDN) - GeeksforGeeks
https://www.geeksforgeeks.org/integrated-services-digital-network-isdn/
WEBApr 18, 2023 · Integrated Services Digital Network (ISDN) Last Updated : 18 Apr, 2023. These are a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network. Before Integrated Services Digital Network (ISDN), the telephone …
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