Network Interface Device - NID The NID is placed on the exterior of the home or business to receive Fiber-To-The-Premise services. The NID is installed free of charge and placed in a location chosen by the owner of the home or business. This is where the fiber optic connection enters the structure. The NID is approximately 9.5 inches wide by 11.5 inches tall. Power Supply/Battery Backup The power supply is placed inside the home or business in a location chosen by the owner of the property. The power supply must be plugged into a wall outlet and be within 100 feet of the NID to ensure proper connectivity. This device also serves as a battery backup. In the event of a power outage, the customer would retain telephone service for up to 8 hours. The electricity to the power supply will cost about 2 cents per day or $8.00 per year. It is comparable to running a plug-in night light. The power supply is approximately 9.5 inches wide by 6.5 inches tall.