Information technology; telecommunications and information exchange between systems; Open Systems Interconnection; protocol for providing the connection-mode transport service (ISO/IEC 8073:1992 and Technical Corrigendum 1:1993); English version EN 28073:1993— 146 стр.
High-level data link control procedures, HDLC; CCITT X.25 LAPB-compatible data link procedures for data terminal equipment; identical with ISO 7776:1986 (status as of 1989)— 31 стр.
Open systems interconnection; protocol for providing the connectionless-mode network service; identical with ISO 8473:1988 (status as of 1989)— 65 стр.
Functional requirements for the interface between data terminal equipment and data circuit-terminating equipment - Part 1: General application— 16 стр.