ISDN

Integrated services digital network: a telecommunication network for end to end transmission of digital data, which provides several teleservices and support services.

The main feature of an integrated services digital network is to enable channels that each have a rate of 64 kbit/s to be aggregated. Thus, basic access with two channels allows a rate of 128 bit/s to be achieved. On an integrated services digital network, sound, data and images can be exchanged, so it can be used to offer services such as telephony, videophone, fax, e-mail etc.