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Broadband Integrated Services Digital NetworkIn the 1970s the telecommunications industry conceived that digital services would follow much the same pattern as voice services, and conceived a grandiose vision of end-to-end circuit switched services, known as the Broadband Integrated Services Digital Network (B-ISDN). This was conceived as a logical extension of the end-to-end circuit switched data service, ISDN. The technology for B-ISDN was going to be Asynchronous Transfer Mode (ATM), which was intended to carry both synchronous voice and asynchronous data services on the same transport. The B-ISDN vision has been overtaken by the disruptive technology of the Internet. The ATM technology survives as a low-level layer in most DSL technologies. Over fibre optic lines, the maximum Data bandwidth is 1.5 Megabits and point-to-point protocol is typically used to carry data over the B channels.
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