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ISDN definition - telecom
A set of ITU-T Recommendations describing a set of interfaces for access to a digital public switched telephone network (PSTN) intended to provide ubiquitous access to a wide range of services, including voice, data, video, and multimedia.The I series ISDN Recommendations map into the OSI Reference Model at the bottom three layers:

Webster's New World Telecom Dictionary Copyright © 2008 by Wiley Publishing, Inc., Indianapolis, Indiana.
Used by arrangement with John Wiley & Sons, Inc.

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