ISO/IEC ISP 10608 is applicable to End Systems concemed with operating in the Open Systems Interconnection (OSI) environment. It specifies a combination of OSI standards which collectively provide the connection-mode Transport Service using the connectionless-mode Network Service. This part of ISO/IEC ISP 10608 is applicable to the provision of the connection-mode Transport Service in End Systems attached to a Token Ring LAN subnetwork from which the standardized connectionless-mode Network Service can be made available.