Patent ID: 6246748
Filing Date: 2001-06-12
Classification: H04M

Abstract:
A power feeding system for feeding D.C. power to a subscriber terminal using a pair of 2-wire subscriber lines of exchange equipment, the power feeding system comprising:a detector for detecting the operation state of each of the pair of 2-wire subscriber lines connected to the exchange equipment;a power supply circuit located between the exchange equipment and the subscriber terminal for supplying the D.C. power to the subscriber terminal through the pair of 2-wire subscriber lines connected to the subscriber terminal; anda switch circuit for connecting the power supply to the pair of 2-wire subscriber lines when the detector detects that the subscriber lines are in a communication state, and for detaching the power supply from the pair of 2-wire subscriber lines while leaving the exchange equipment connected to the subscriber terminal through the pair of two-wire subscriber lines when the detector detects that the operation state is a subscriber line test state.