A public, circuit switched digital network.
An international standard for telephone transmission. ISDN provides an end-to-end digital network and provides a standard for out-of-band signaling. It also provides greater bandwidth than older telephone services. The two standard levels of ISDN are the Basic Rate Interface (BRI) and the Primary Rate Interface (PRI).
A widely available high bandwidth switched network service providing end-to-end digital connectivity over standard phone lines for simultaneous transmission of voice and data. There are two levels of service: Basic Rate Interface-ISDN (BRI-ISDN)--provides for digital transmission of two 64 kbps bearer channels and one 16 kbps data and signaling channel (2B+D). Learn more. Primary Rate Interface-ISDN (PRI-ISDN)--provides for digital transmission of twenty three (23) 64 kbps bearer channels and one (1) 64 kbps data and signaling channel (23 B+D). Learn more.