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

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

Home and Building Electronic Systems (HBES) - Part 5-2: Media and media dependent layers - Network based on HBES Class 1, Twisted Pair; English version EN 50090-5-2:2020
Edition 2021-02

Information processing systems; fibre distributed date interface (FDDI); part 2: token ring media access control (MAC) (ISO 9314-2:1989); English version EN 29314-2:1993
Edition 1993-12

Network Aspects (NA); Metropolitan Area Network (MAN); physical layer convergence procedure for 155,520 Mbit/s; English version ETS 300216:1992
Edition 1993-07

Industrial communication networks - Fieldbus specifications - Part 4-21: Data-link layer protocol specification - Type 21 elements (IEC 61158-4-21:2019); English version EN IEC 61158-4-21:2019, only on CD-ROM
Edition 2020-08

Integrated Services Digital Network (ISDN); ISDN lower layer protocols for telematic terminals; English version ETS 300080:1992
Edition 1993-09

Space engineering - Adoption Notice of CCSDS 132.0-B-2, TM Space Data Link Protocol; English version EN 16603-50-22:2022
Edition 2022-11

European digital cellular telecommunications system - Half rate speech - Part 1: Half rate speech processing functions; English version ETS 300581-1:1995
Edition 1996-07

Data communication; multilink procedures; identical with ISO 7478:1987 (status as of 1989)
Edition 1989-11