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What is an ISDN (Integrated Service Digital Network) what........?
are its components and how does it works.
Thanks.
ISDN stands for Integrated Service Digital Network, and as the name suggests it allows digital communication. This is favourable as digital technology is a lot faster, and more accurate than the old analogue lines as they no longer require the process of modulation and demodulation. ISDN relies on already existing copper cable systems, causing it’s integration into our existing communications system to be smoother and less disruptive.
According to ITU-T(formerly CCITT) "an ISDN is a network, in general evolving from a telephony IDN, that provides end-to-end digital connectivity to support a wide range of services, including voice and non-voice services, to which users have addressed by a limited set of standard multi-purpose user-network interfaces." The key point of this definition is the ability to support voice services adequately, this has not been achieved using any other concept.
ISDN has four major aspects; telephone network; integrated services; digital; network. These will be explored in a little more detail later.
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