European digital cellular telecommunications system (Phase 2) - Layer 1 - General requirements; English version ETS 300553:1994
Edition 1995-01

Layer 2 Standard Specification for the Smart Utility Network
Edition 2017-07-11

TDMA- Third Generation Wireless- Digital Control Channel Layer 2
Edition 2000-03-31

TDMA Third Generation Wireless - Digital Traffic Channel Layer 2
Edition 1999-03-03

European digital cellular telecommunications system (Phase 2) - Base Station Controller - Base Transceiver Station (BSC-BTS) interface - Layer 2 specification; English version ETS 300595:1994
Edition 1995-02

Information technology. Small Computer System Interface (SCSI). SAS Protocol Layer. 2 (SPL-2)
Edition 2017-03-31

Information technology - Small Computer System Interface (SCSI) - Part 262: SAS Protocol Layer - 2 (SPL-2) (Adopted ISO/IEC 14776-262:2017, edition 1.0, 2017-02)
Edition 2018-09-01

Information technology - Small computer system interface (SCSI) - Part 262: SAS protocol layer - 2 (SPL-2)
Edition 2017-02

Integrated Services Digital Network (ISDN) - Narrowband Multi-service Delivery System (NMDS) - Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) specification for the NMDS Layer 2 PSTN-GW function (NTN side) (Endorsement of the English version EN 301141-6 V 1.1.1 (2002-02) as German Standard)
Edition 2002-11

Integrated Services Digital Network (ISDN) - Narrowband Multi-service Delivery System (NMDS) - Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) specification for the NMDS Layer 2 PSTN-GW function (NTN side) (incl. Diskette!!!)
Edition 2002-05-01