A technology suite geared to multimedia. There are two transmission schemes: STM (synchronous transfer mode) and ATM.
a single ISDN that can handle voice, data, and eventually video services
The first ATM specifications, ratified by ANSI and by the InternationalTelegraph and Telephone Consultative Committee (CCITT). B-ISDN specifiesstandards for a high-speed network using ATM as its transport mechanism.