104 describes the characteristics, construction and test methods of small count optical fibre cables for indoor applications. This Recommendation deals with. This document outlines the recommendations for single-mode optical fiber cables used in telecommunication networks within buildings, focusing on their mechanical and environmental characteristics. It specifies that these cables must comply with standards such as ITU-T G. 657, and IEC. This guide explores different types of fiber optic cable, including indoor fiber optic cable and outdoor fiber optic cable, and outlines best practices for installation in different settings.