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What is ISDN?

ISDN stands for 'Integrated Services Digital Network'. It allows direct access to dial-up digital lines & helped to revolutionise modern telecommunications when it first came into existence in 1984. What ISDN did was to integrate voice & data into one connection, precluding the need for separate systems such as telephone, fax & internet. It is believed that ISDN will eventually replace all existing specialised types of lines & provide a common communications platform. Digital transmission of data is instantaneous & accurate as it is not subject to the distortion that can occur with analogue systems.

It allows high quality audio transmission, efficient data transfer & faster internet access than traditional modems. Other activities which ISDN enables include desktop conferencing, video surveillance video conferencing & videotelephony. Two levels of service are available with ISDN; BRI (Basic Rate Interface), designed for the home & small enterprises & PRI (Primary Rate Interface) which is specific to larger companies.

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