In a system using the Asynchronous Transfer Mode (ATM) for data transfers, each cell is usually routed in response to VPI/VCI values identifying a previously established connection. A connectionless transfer mode is disclosed by which to each requesting user, a unique routing identifier (RI) is allocated....http://www.google.com.au/patents/US5432777?utm_source=gb-gplus-sharePatent US5432777 - Connectionless ATM data services
