Optical network unit, power source equipment and power supply system using the same

PURPOSE: An optical network unit, power source apparatus, and power supply system using the same are provided to reduce unnecessary power consumption by stably supplying power to an optical network unit. CONSTITUTION: A communication sensing unit(207) senses communication between one or more power source apparatus(210~212) and an optical network unit. A power control unit(204) senses application states of a power source. The power control unit controls power supplied from the power source apparatus based on one or more power approval states. The optical network unit receives power source through a power supply exclusive connector of the power source apparatus.