Unplugging the ONT or fiber gateway from its electrical source removes all power from the device. This protects the internal electronic components and helps ensure the fiber port is inactive, minimizing the risk of exposure to the infrared light signal. However, situations may arise requiring you to disconnect these specialized cables from modems or routers. Fiber optic cables are different from traditional copper cables, as they use light to transmit data, and the connectors are more sensitive. My network provider is still fixing things coz of that and it's taking a lot of time which is understandable. But since i am without. If unplugging and removing the ONT, remember that the optical pigtail cable and green fibre jack plug is rather fragile, and needs to be kept free from dust: you definitely don't want it just hanging on a skirting board. This is a popular video tutorial that is often requested by viewers.