Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol - Data link layer - Part 6: Test Suite Structure and Test Purposes (TSS&TP) specification for the general protocol; English version ETS 300402-6:1997
Edition 1997-11

European digital cellular telecommunications system (Phase 2) - Mobile Station - Base Station System (MS-BSS) interface - Data Link (DL) layer specification; English version ETS 300555:1994
Edition 1995-01

Integrated Services Digital Network (ISDN); user-network interface data link layer specification; application of CCITT recommendations Q.920/I.440 and Q.921/I.441; english version ETS 300125:1991
Edition 1992-05

Electricity metering - Data exchange for meter reading, tariff and load control - Part 46: Data link layer using HDLC-protocol (IEC 62056-46:2002 + A1:2006); German version EN 62056-46:2002 + A1:2007, text in English
Edition 2007-08

Attachment requirements for Data Terminal Equipment (DTE) to connect to Packet Switched Public Data Networks (PSPDN) using CCITT recommendation X.25 (1984) interface; requirements applicable to DTEs subscribing to Multilink operation; english version ETS 300124:1991
Edition 1992-08

Data communication - X.25 DTE conformance testing - General principles; identical with ISO/IEC 8882-1:1996
Edition 1997-06

Ophthalmic optics - Spectacle frames and sunglasses electronic catalogue and identification - Part 3: Technical information (ISO 10685-3:2012); German version EN ISO 10685-3:2012
Edition 2013-03

Assistive products for walking manipulated by both arms - Requirements and test methods - Part 1: Walking frames (ISO 11199-1:2021); German version EN ISO 11199-1:2021
Edition 2021-09

Attachment requirements for Data Terminal Equipment (DTE) to connect to Packet Switched Public Data Networks (PSPDN) using CCITT recommendation X.25 (1984) interface; requirements applicable to DTEs subscribing to Link Access Procedure Balanced (LAPB) extended (modulo 128) operation; english version ETS 300123:1991
Edition 1992-08

Health informatics - Point-of-care medical device communication - Part 30200: Transport profile - Cable connected (ISO/IEEE 11073-30200:2004); English version EN ISO 11073-30200:2005
Edition 2006-11