Asynchronous Transfer Mode (ATM) Networking Asynchronous Transfer Mode (ATM) is, and will be for many years to come, the top of the line in networking technology. Since the creation of the Network (the ARPAnet (Advanced Research Project Agency Network)) scientists and engineers have strived to achieve the fastest information exchange speeds combined with the most cost-efficient hardware and software. Their products and ideas have always been based on packet technology and turn-based transfers; however, in the 1980s an experimental system called ATM challenged these axioms. The ATM consisted of a new topology - Async