ISO/IEC ISP 10608-1:1992
Information technology -- International Standardized Profile TAnnnn -- Connection-mode Transport Service over Connectionless-mode Network Service -- Part 1: General overview and subnetwork-independent requirements
Applies to end systems concerned with operating in the Open Systems Interconnection (OSI) environment. Specifies a combination of OSI standards, which collectively provide the Connection-mode Transport Service using the Connectionless-mode Network Service. Profiles of the Connection-mode Transport Service over Connectionless-mode Network Service are members of a single group, Group TA, and support a single transport class, i.e. Class 4.