BSENIEC 61280-4-1:2019+A1:2022 Incorporating corrigenda April 2020 and December 2022 BSl Standards Publication Fibre-optic communication subsystem test procedures Part 4-1: Installed cabling plant Multimode attenuation measurement bsi. BRITISH STANDARD BSENIEC61280-4-1:2019+A1:2022 National foreword This British Standard is the UK implementation of EN IEC 61280-4-1:2019+A1:2022. It is identical to IEC 61280-4-1:2019 incorporating corrigendum April 2020, amendment 1:2021, and corrigendum December 2022. It supersedes BS EN IEC 61280-4-1:2019, which is withdrawn. The start and finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes to IEC text carry the number of the IEC amendment. For example, text altered by IEC amendment 1 is indicated by A Al. The UK participation in its preparation was entrusted to Technical Committee GEL/86/3, Fibre optic systems and active devices. A list of organizations represented on this committee can be obtained on request to its committee manager. Contractual and legal considerations This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BsI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law This publication is provided as is, and is to be used at the recipient's own risk. The recipient is advised to consider seeking professional guidance with respect to its use of this publication. This publication is not intended to constitute a contract. Users are responsible for its correct application. @ The British Standards Institution 2023 Published by BSI Standards Limited 2023 ISBN 9780539254037 ICS 33.180.01 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2019. Amendments/corrigenda issued since publication Date Text affected 31 May 2020 Implementation of IEC corrigendum April 2020: last paragraph of 1.4.1 replaced 31 May 2022 Implementation of IEC amendment 1:2021 with CENELEC endorsement A1:2022 31 May 2023 Implementation of IEC corrigendum December 2022: first paragraph of 6.3 amended BSENIEC 61280-4-1:2019+A1:2022 EN IEC 61280-4-1:2019+A1 EUROPEANSTANDARD NORMEEUROPEENNE EUROPAISCHE NORM December 2022 ICS 33.180.01 Supersedes EN 61280-4-1:2009 and all of its amendments and corrigenda (if any) English Version Fibre-optic communication subsystem test procedures - Part 4-1: Installed cabling plant - Multimode attenuation measurement (IEC 61280-4-1:2019) Procedures d'essai des sous-systemes de Prufverfahren fur Lichtwellenleiter- telecommunication fibroniques - Partie 4-1: Installation Kommunikationsuntersysteme - Teil 4-1: Lichtwellenleiter- cablee- Mesure de I'affaiblissement en multimodal Kabelanlagen-Mehrmoden-Dampfungsmessungen (IEC 61280-4-1:2019) (IEC 61280-4-1:2019) This European Standard was approved by CENELEC on 2019-06-26. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC ManagementCentreortoanyCENELECmember. This European Standard exists in three official versions (English, French, German). A version in any other language made by translatior under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the