This part of IEC 60793 contains the general specifications for both multimode and single-
mode optical fibres.  
Sectional specifications for each of the four categories of multimode fibres: A1, A2, A3, and A4 (part of the multimode fibre class A) contain requirements specific to each category.  
Sectional specifications for each of the three single-mode fibre classes, B, C and D contain 
requirements common to each class. 
Each sectional specification includes family specifications (in normative annexes) that contain requirements for the applicable category or sub-categories. These sub-categories are distinguished on the basis of different fibre types or applications.  
The requirements of this document apply to all classes.  
Each sectional specification contains the requirements that are common to all the family 
specifications that are within it. These common requirements are copied to the family 
specification for ease of reference. 
Tests or measurement methods are defined for each specified attribute. Where possible, 
these definitions are by reference to an IEC International Standard (see IEC 60793-1 series) – otherwise the test or measurement method is outlined in the relevant sectional specification. 
Table 1 defines the sectional specifications. The relevant family specifications are defined 
within the sectional specifications as normative annexes (see Tables 2 to 5).dition 9.0 2019-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Optical fibres – Part 2: Product specifications – General Fibres optiques – Partie 2: Spécifications de produits – Généralités IEC 60793-2:2019-11(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright ？ 2019 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced o