In this video, we explain how to lay 4 core optical fiber cable (OFC) step by step. ing and blowing a cable in a duct and the impact on the cable designs. To ensure all specifications are met, consult the specific cable specification sheet for the cable you. The objective of this document is to be an optical fibre cable installation and laying guide, addressed to new installers, also being useful as a reminder to experienced installers. It shall be suitable for indoor applications, complying with IEC standards for l w smoke / zero halogen and EuroClass Cca and B2ca for fire protection. Note that Recommendation ITU-T L.