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ISDN (Integrated Services Digital Networking) is a major communications development whereby voice, data and video, for instance, are integrated and transmitted over an extensive network of digital exchanges. It is an extremely fast mechanism for transmitting data. Now in its 3rd edition, this title provides an overview of the principles and applications of ISDN (Integrated Services Digital Networking) operations and applications. More information on broadband aspects is included and there is an explanation of Signalling Access Protocols.