In the 1980s the telecommunications industry expected that digital services would follow much the same pattern as voice services did on the public switched telephone network, and conceived a grandiose vision of end-to-end circuit switched services, known as broadband integrated services digital network (B-ISDN). This was designed in the 1990s 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 digital subscriber line (DSL) technologies, and as a payload type in some wireless technologies such as WiMAX.
See also
- Dynamic synchronous transfer mode, a revival of circuit switching technology for broadband traffic
External links
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