The broadband transmission counterpart of Integrated Services Digital Network (ISDN). Broadband ISDN (B-ISDN) encompasses a set of International Telecommunication Union (ITU) standards and services designed to provide an integrated digital network for audio, video, and data transmission.
Instead of using the copper media used in ordinary ISDN, broadband ISDN uses fiber-optic and radio media. Broadband ISDN is designed to use the cell-switching transport technology of Asynchronous Transfer Mode (ATM) together with the underlying physical transport mechanisms of Synchronous Optical Network (SONET).
Broadband ISDN standards and technologies are an emerging option for high-speed networking that promises the capabilities of high-speed digital connectivity for homes and businesses.