Ques : What is Asynchronous Transfer Mode (ATM)

 ATM is a form of data transmission that allows

voice, video and data to be sent along the same network. In contrast to ATM, in the
past, voice, video and data were transferred using separate networks. For example,
voice was transmitted over the phone, video over cable networks and data over an
internet work. ATM has its similarities with the frame relay, particularly in the term
of data unit size, frame replay used a variable length data unit called frame. On the
contrary, ATM used fixed data unit named as “cell”, we can say ATM as Cell-Relay
in analogy to frame relay.