Monthly Maintenance: Randomly inspect fiber optic cable connections, test backbone fiber optic link attenuation, and clean connector end faces. Quarterly/Semi-annual Maintenance: Perform OTDR testing on fiber optic lines, verify system alarm records, and update. Some people have suggested that fiber optic networks need periodic maintenance, including microscopic inspection of connectors and mating adapters and even insertion loss testing or taking OTDR traces. Regular maintenance and. Recommendation ITU-T L. They offer high speed, minimal signal loss, and resistance to electromagnetic interference, making them the medium of choice for transmitting high-definition video and audio content.