Integrated Services Digital Network (ISDN) consists of data-transport and digital telephony services provided by local exchange carriers. ISDN enables the digitalization of the Public Switched Telephone Network (PSTN) which allows voice, text, music, data, graphics, video, and other forms of data to be transmitted over traditional telephone lines. ISDN was designed to create an end-to-end digital communication. This would facilitate high speed data transfer, video conferencing, digital voice communication, and other digital communications applications. This…
Last Updated on July 9, 2026