EN IEC 61280-4-2:2024/prA1:2026

SLOVENSKI STANDARD
01-februar-2026
Postopki za preskušanje optičnih komunikacijskih podsistemov - 4-2. del:
Kabelska inštalacija - Meritve slabljenja v enorodovnih vlaknih in optičnih
povratnih izgub - Dopolnilo A1
Amendment 1 - Fibre-optic communication subsystem test procedures - Part 4-2:
Installed cabling plant - Single-mode attenuation and optical return loss measurements
Prüfverfahren für Lichtwellenleiter-Kommunikationsuntersysteme - Teil 4-2: Installierte
Kabelanlagen - Einmoden-Dämpfungs- und optische Rückflussdämpfungsmessung
Procédures d’essai des sous-systèmes de télécommunication fibroniques - Partie 4-2:
Installations câblées - Mesures de l'affaiblissement de réflexion optique et de
l'affaiblissement des fibres unimodales
Ta slovenski standard je istoveten z: EN IEC 61280-4-2:2024/prA1:2025
ICS:
33.180.01 Sistemi z optičnimi vlakni na Fibre optic systems in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

86C/1997/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61280-4-2/AMD1 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-11-28 2026-02-20
SUPERSEDES DOCUMENTS:
86C/1984/CD, 86C/1989A/CC
IEC SC 86C : FIBRE OPTIC SYSTEMS, SENSING AND ACTIVE DEVICES
SECRETARIAT: SECRETARY:
United States of America Mr Fred Heismann
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
SC 86A,SC 86B
ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is
the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Amendment 1 - Fibre-optic communication subsystem test procedures - Part 4-2: Installed
cabling plant - Single-mode attenuation and optical return loss measurements

PROPOSED STABILITY DATE: 2029
NOTE FROM TC/SC OFFICERS:
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IEC CDV 61280-4-2/AMD1 © IEC 2025
1 INTERNATIONAL ELECTROTECHNICAL COMMISSION
2 ____________
4 FIBRE-OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES –
6 Part 4-2: Installed cabling plant – Single-mode attenuation
7 and return loss measurements
9 AMENDMENT 1
11 FOREWORD
12 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
13 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
14 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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34 6) All users should ensure that they have the latest edition of this publication.
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40 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
41 indispensable for the correct application of this publication.
42 9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
43 patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
44 respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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46 the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
47 shall not be held responsible for identifying any or all such patent rights.
48 Amendment 1 to IEC 61280-4-2:2024 has been prepared by subcommittee 86C: Fibre optic
49 systems and active devices, of IEC technical committee 86: Fibre optics.
50 The text of this Amendment is based on the following documents:
Draft Report on voting
86C/XX/FDIS 86C/XX/RVD
52 Full information on the voting for its approval can be found in the report on voting indicated in
53 the above table.
54 The language used for the development of this Amendment is English.
IEC CDV 61280-4-2/AMD1 © IEC 2025
55 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
56 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
57 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
58 described in greater detail at www.iec.ch/publications/.
59 The committee has decided that the contents of this document will remain unchanged until the
60 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
61 specific document. At this date, the document will be
62 • reconfirmed,
63 • withdrawn, or
64 • revised.
66 ____________
68 INTRODUCTION
69 Add, after the last sentence of the first paragraph, the following new text:
70 This document focusses on attenuation and optical return loss measurements of installed point-
71 to-point cabling plants using single-mode fibres and connectors with cylindrical ferrules.
72 Attenuation and optical return loss measurements of installed passive optical networks using
73 single-mode fibres are described in IEC 61280-4-3, whereas attenuation measurements of
74 installed cabling plants using multi-fibre MPO connectors and single-mode or multimode fibres
75 are covered in IEC 61280-4-5.
76 Attenuation measurements of installed point-to-point cabling plants using multimode fibres and
77 connectors with cylindrical ferrules are defined in IEC 61280-4-1.
80 2  Normative references
81 Add, to the second entry in the list of references, the year of publication “2022” of Edition 3.0,
82 so that the second entry reads as follows:
83 IEC 61300-3-35:2022, Fibre optic interconnecting devices and passive components − Basic test
84 and measurement procedures − Part 3-35: Examinations and measurements − Visual inspection
85 of fibre optic connectors and fibre-stub transceivers
88 3.1 Terms and definitions
89 Add the following terms and definitions after the last existing term 3.1.15:
90 3.1.16
91 non-linear surface irregularity
92 non-linear anomaly detected by the microscope on the surface of the fibre or ferrule end face
93 Note 1 to entry: Linear surface irregularities are excluded from this definition.
94 Note 2 to entry: Non-linear surface irregularities can be caused, for example, by pits in the connector end face or by
95 foreign material on the surface of the end face.
96 3.1.17
97 size of non-linear surface irregularity
IEC CDV 61280-4-2/AMD1 © IEC 2025
98 diameter of the smallest circle that can encompass the entire non-linear surface irregularity
99 3.1.18
100 linear surface irregularity
101 linear anomaly detected by the microscope on the surface of the fibre end face, where the width
102 of the anomaly is smaller than or equal to one fifth of its length
103 Note 1 to entry: Linear surface irregularities can be caused, for example, by scratches in the connector end face or
104 by micro fibres on the surface of the end face.
105 Note 2 to entry: The width of the linear surface irregularly is the maximum width along the irregularity.
106 3.1.19
107 contact area
108 diameter of 250 µm centred about the ferrule axis
111 6.9  Connector end-face cleaning and inspection equipment
112 Replace the entire existing text of 6.9 with the following new text:
113 6.9.1  General
114 Cleaning equipment (including apparatus, materials, and substances) and the methods to be
115 used for cleaning should be in accordance with IEC TR 62627-01. Connector suppliers’
116 instructions should be consulted where doubt exists as to the suitability of particular equipment
117 and cleaning methods.
118 A microscope is required to verify that the connector end faces of the test cords and cabling
119 are clean and free of excessive damage. A direct view or video microscope (with or without
120 automated analysis) as described in IEC 61300-3-35:2022, 4.2, 4.3 and 4.4 should be
121 used. The microscope shal
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