ATM direct connectionless service

A method is proposed by which an asynchronous transfer mode (ATM) network can directly provide a connectionless data service in a customer premises network. Cells that carry connectionless messages are routed to their destination based on an address written in the VPI/VCI field. This is performed directly by the ATM switches, without any overlay switching functions. The method applies to one addressing domain, which can match a customer premises network. The basic protocols and a buffer protection scheme which can be employed for implementing the service are given. For destinations outside the domain, the protocols allow a transparent use of the connectionless service defined by the CCITT