B-ISDN


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B-ISDN

(Broadband-ISDN) A framework for advanced telecommunications from the ITU. Introduced in 1988 as an extension to ISDN, it was designed to provide a blueprint to integrate data, voice and video in the 21st century. B-ISDN specifies the use of ATM for switching and SONET for high-speed links. See ATM and SONET.
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The ATM layer is a unique layer that carries all the different classes of services supported by B-ISDN within a 53-byte cell [5].
By this time, a true B-ISDN and ATM WAN can be in place.
SMDS and B-ISDN need fiber to the office to maximize their potential benefits and the RBOCs are well aware of this.