28 Sep 08 Integrated Services Digital Network (ISDN)

If you are using a telephone, your voice, which is analog, is converted into digital when it enters the switching equipment. If you are using a computer, its digital signal is converted to analog by a modem. This analog signal is converted back to digital at the local exchange. ISDN can be looked at in two ways-as a network and as an interface. From a very narrow perspective, ISDN is: A set of protocols that define how voice and data can be communicated simultaneously over the existing subscriber’s loop. It provides the user with integrated access to both the Public Switched Telephone Network and Public Packet Data Networks. Any equipment developed in accordance with these protocols for the purpose of implementing this interface between the user and these networks. Any telecommunication user services, whether existing or new, that are consistent with the protocols and are available to ISDN customers over this interface.

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