Environmental Engineering (EE) - Environmental conditions and environmental tests for telecommunications equipment - Part 2-0: Specification of environmental tests - Introduction
Edition 2003-12-01

Integrated Services Digital Network (ISDN) - Signalling System No.7 (SS7) - ISDN User Part (ISUP) version 4 for the international interface - Part 20: Completion of Calls on No Reply (CCNR) supplementary service [ITU-T Recommendation Q.733, clause 5 (1999), modified]
Edition 2001-11-01

Indoor air - Part 20: Detection and enumeration of moulds - Determination of total spore count (ISO 16000-20:2014)
Edition 2016-06-15

Small-bore connectors for liquids and gases in healthcare applications - Part 20: Common test methods (ISO/DIS 80369-20:2023)
Edition 2023-05-01

Semiconductor devices - Micro-electromechanical devices - Part 20: Gyroscopes (IEC 62047-20:2014) (german version)
Edition 2015-06-01

Fibre optic active components and devices - Package and interface standards - Part 3: SFF 20-pin transceivers (IEC 62148-3:2010) (german version)
Edition 2011-07-01

Fibre optic active components and devices - Package and interface standards - Part 3: SFF 20-pin transceivers (IEC 62148-3:2010) (Corrigendum)
Edition 2013-04-01

Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 12: Supplementary services stage 3 - Sub-part 20: Discreet Listening (DL) (ETSI EN 300392-12-20 V1.2.1 (2012-04))
Edition 2012-06-01

ElectroMagnetic Compatibility (EMC) standard for radio equipment and services; Part 20: Specific conditions for Mobile Earth Stations (MES) used in the Mobile Satellite Services (MSS); Harmonised Standard for ElectroMagnetic Compatibility (ETSI EN 301 489-20 V2.2.1 (2021-11))
Edition 2022-02-01

IMT cellular networks; Harmonised Standard covering the essential requirements of article 3.2 of the Directive 2014/53/EU; - Part 20: OFDMA TDD WMAN (Mobile WiMAXTM) TDD Base Stations (BS) (ETSI EN 301 908-20 V6.3.1 (2016-05))
Edition 2016-07-01