IEC 60794-1-208:2025/COR1:2025
(Corrigendum)Corrigendum 1 - Optical fibre cables - Part 1-208: Generic specification - Basic optical cable test procedures - Environmental test methods - Pneumatic resistance, Method F8
Corrigendum 1 - Optical fibre cables - Part 1-208: Generic specification - Basic optical cable test procedures - Environmental test methods - Pneumatic resistance, Method F8
Corrigendum 1 - Câbles à fibres optiques - Partie 1-208: Spécification générique - Procédures fondamentales d’essais des câbles optiques - Méthodes d’essais d'environnement - Résistance pneumatique, Méthode F8
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
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IEC 60794-1-208 IEC 60794-1-208
Edition 1.0: 2025-04 Édition 1.0 2025-04
Optical fibre cables Câbles à fibres optiques
Part 1-208 Generic specification - Basic optical Partie 1-208: Spécification générique -
cable test procedures - Environmental test Procédures fondamentales d’essais des câbles
methods - Pneumatic resistance, Method F8: optiques - Méthodes d’essais
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IEC TR 62284:2025 which is a Technical Report, applies to single-mode optical fibres. Its object is to document the methods for measuring the effective area (Aeff) of these fibres. It defines three methods of measuring Aeff. Information common to all the methods is found in the body of this document. Information specific to each method is found in the annexes. The three methods are:
a) direct far-field (DFF);
b) variable aperture in the far-field (VAMFF);
c) near-field (NF).
The reference method, used to resolve disputes, is method A, direct far-field.
Effective area is an optical attribute that is specified for single-mode fibres and used in system designs probably affected by the non-linear refractive index coefficient, n2. There is agreement in both national and international standards bodies concerning the definition used in this document. Methods A, B, and C have been recognised as providing equivalent results, provided that good engineering is used in implementation.
The direct far-field is the reference method because it is the most direct method and is named as the reference method for mode field diameter in IEC 60793-1-45 and ITU-T Recommendation G.650.1.
A mapping function is a formula by which the measured results of one attribute are used to predict the value of another attribute on a given fibre. For a given fibre type and design, the mode field diameter (MFD) (IEC 60793-1-45) can be used to predict the effective area with a mapping function. A mapping function is specific to a particular fibre type and design. Mapping functions are generated by doing an experiment in which a sample of fibre is chosen to represent the spectrum of values of MFD and in which the fibres in the sample are measured for both MFD and Aeff. Linear regression can be used to determine the fitting coefficient, k, as defined by the following:
NOTE 1 Other mathematical models can be used if they are generally more accurate.
NOTE 2 See Annex E for more information.
This second edition cancels and replaces the first edition published in 2003. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) improvement of the description of measurement details for B-657 fibre;
b) modification of the minimum distance between the fibre end and the detector for the direct far field scan (Annex A);
c) deletion of Annex H.
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IEC 60794-1-129:2025 applies to optical fibre cables for use with telecommunication equipment and devices employing similar techniques, and to cables having a combination of both optical fibres and electrical conductors. The document defines test procedures used in establishing uniform requirements for mechanical performance-straight midspan access to optical elements. Throughout this document, the wording "optical cable" also includes optical fibre units, microduct fibre units, etc.
NOTE See IEC 60794‑1‑2 for a reference guide to test methods of all types and for general requirements and definitions.
This edition includes the following significant technical changes with respect to IEC 60794‑1‑21:2015 and IEC 60794-1-21:2015/AMD 1:2020:
a) this document cancels and replaces method E29 of IEC 60794-1-21:2015 and IEC 60794‑1‑21:2015/AMD 1:2020;
b) addition of the description for applicable cable types;
c) update of Figure 2a), Figure 2b) and Figure 3;
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NOTE Throughout the document, the wording "optical cable" can also include optical fibre units, microduct fibre units, etc.
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e) replacement of "Fibre cut-off wavelength" with "Cable cut-off wavelength" and revision of "Note b" in Table 6;
f) replacement of "Fibre cut-off wavelength" with "Cable cut-off wavelength" and deletion of the "Note" in Table 8;
g) addition of 200 μm coating diameter requirements for C1_125 fibres and change of coating diameters limits for C1_80 fibres in Table A.1;
h) addition of 200 µm coating diameter requirements for C1_125 fibres and change of coating strip force limits in Table A.2 and in Table A.5;
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j) addition of a transmission requirements at 1 625 nm and deletion of 1 310 nm for C1 fibres in Table A.4;
k) modification of "Fibre cut-off wavelength" limits of C3 fibres in Table C.3;
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b) modification of the test method title according to item a);
c) deletion of the tube diameter requirement for the test object;
d) modification of the default temperature range according to IEC 60794-1-1;
e) addition of the default coiled turns in the assembly during the test.
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a) addition of a system to maintain a constant cable tension during the test as well as means to measure the free loop antinode amplitude;
b) definition of the cable load which is now fixed to 25 % of the rated tensile strength for OPGW/OPPC, or to the maximum installation tension (MIT) for ADSS cables;
c) addition of the target free loop peak-to-peak antinode amplitude to the procedure. The quality of the aeolian vibration motion is done through the average antinode
d) addition of fatigue damage and ovality changes of the optical core to 4.5.
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