The ISDN is a set of international digital telephone switching standards. ISDN
networks, which can be used to transmit voice, data, and video, offer the advantages of
error-free connections, fast call setup times, predictable performance, and faster data
transmission than possible using modems over traditional analogue telephone networks.
Basic ISDN services combine voice and data, while broadband services add video and
higher-speed data transmission. As telephone companies have progressively installed ISDN
services, there has been much experimentation with distance education applications,
notably for audiographic conferencing and multimedia desktop conferencing.
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