To troubleshoot this problem, you need to inspect the connectors visually and use a power meter or an optical time-domain reflectometer (OTDR) to measure the optical power and attenuation at the FDC. When it's plugged in, there's no light visible from the transmitter. To compare, I checked another working SFP — the TX light is visible immediately, and the RX/TX power levels look. Fiber optic troubleshooting is an essential skill for network administrators, technicians, and engineers responsible for maintaining and repairing fiber optic systems. These high-speed, high-capacity communication networks are increasingly replacing copper cables, offering superior performance and. There are many possible causes of faults because providing customers with fiber-optic communication requires equipment rooms, fiber-optic converters, fiber-optic lines, user optical modems, user computers, or Wi-Fi routers, which involve many different devices and lines. Troubleshooting requires a. The media converter sits at the original house where the source internet is, the fiber comes out the media converter and goes to the second unit, where it plugs into the fiber switch. However, I tested this setup and I am not getting any connectivity, the fiber status light stays dark at both the. OpenReach put in full fibre to my house 6 days ago, and it hasn't worked yet! My BT Smart Hub 2 lights are flashing purple all the time, which suggest no cable connection.