This International Standardized Profile 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 connection-mode Network Service. This part of ISO/IEC ISP 10609 applies only to communication over those Subnetworks which are ISO/IEC 8802- 3 CSMA/CD LANs.