Integrated Services Digital Network (ISDN); support of CCITT recommendation X.21, X.21bis and X.20bis based Data Terminal Equipments (DTEs) by an ISDN; synchronous and asynchronous terminal adaption functions; english version ETS 300103:1990
Edition 1992-02

Industrial communication networks - Fieldbus specifications - Part 5-3: Application layer service definition - Type 3 elements (IEC 61158-5-3:2014); English version EN 61158-5-3:2014, only on CD-ROM
Edition 2015-09

Transmission and Multiplexing (TM) - Flexible Multiplexer Equipment - Part 1: Core functions, 2048 kbit/s aggregate interface functions, tributary interface functions and special functions; English version ETS 300461-1:1996
Edition 1997-07

Frame relay services - Part 1: General description; English version ETS 300399-1:1995
Edition 1995-11

Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol - Signalling network layer for circuit-mode basic call control - Part 4: Test Suite Structure and Test Purposes (TSS&TP) specification for the user; English version ETS 300403-4:1997
Edition 1997-11

Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol - Data link layer - Part 2: General protocol specification [ITU-T Q.921 (1993), modified]; English version ETS 300402-2:1995
Edition 1996-06

Home and Building Electronic Systems (HBES) - Part 4-2: Media independent layers - Transport layer, network layer and general parts of data link layer for HBES Class 1; German version EN 50090-4-2:2004, text English
Edition 2004-07

Home and Building Electronic Systems (HBES) - Part 4-1: Media independent layers - Application layer for HBES Class 1; German version EN 50090-4-1:2004, text English
Edition 2004-06

Industrial communication networks - Fieldbus specifications - Part 3-28: Data-link layer service definition - Type 28 elements (IEC 61158-3-28:2023); English version EN IEC 61158-3-28:2023
Edition 2024-06

Digital cellular telecommunications system (Phase 2) - Base Station System (BSS) management information; English version ETS 300622:1996
Edition 1997-07