ATM - Asynchronous Transfer Mode¶
ATM was supposedly the future of telecom networking in the late 90ies/early 2000s. Its promise was to provide both circuit-switched as well as packet-switched services.
ATM was also supposed to become the basis for the German B-ISDN (broadband ISDN) services on which much literature can be found, but which never really saw widespread adoption.
While ATM was deployed in public communication networks for some time, it never saw as much adoption as expected; many users went to using IP directly in SDH or (later ) Ethernet. Circuit-switched services were implemented as VoIP on top of IP.