This standard BS EN 60793-2-20:2002 Optical fibres. Product specifications is classified in these ICS categories:
33.180.10 Fibres and cables
Covers specific requirements of optical fibres type A2a, A2b and A2c. These fibres are used in information transmission equipment and optical fibre cables (typically up to 2 km). For general requirements, see IEC 60793-2.