This guide provides a detailed roadmap for locating and fixing fiber optic cable breaks, covering detection techniques, repair methods, and best practices. UN Tech Agency Moves to Protect Submarine Cables as Tensions [. ] Chinese. 1 Cable ships are dispatched to the fault location. Cables can be broken or crushed. This topic describes the unified gateway physical connection with the E1/T1 trunk cable and common E1/T1 alarms. The E1 and T1 trunks use the same physical cable. The communication trunk optical cable has the characteristics of large transmission capacity, fast speed, simple maintenance and low cost. In order to ensure the. Optical Time Domain Reflectometers (OTDR) provide graphical data and analysis along the entire length of a cable, but they can be expensive and require more time and skill to operate.