Abstract:
A system comprising customer premises equipment including a reverse power supply unit and an access node to which the customer premises equipment is connected for permitting telephony devices connected to the customer premises equipment to make and receive telephone calls via the customer premises equipment and the access node. The reverse power supply unit is suitable for supplying electrical power from the customer's premises to an access node via a twisted copper pair, the reverse power supply unit including a power consumption signature detector operable to detect if the power drawn from the reverse power supply unit corresponds to a signature power consumption pattern indicative of a telephony device being in or transitioning into an off-hook state when connected directly to the reverse power supply unit and not being connected via a current limiting interface.
Abstract:
To initiate the transmission of electrical power over a telecommunications connection from a power-collecting telecommunications interface unit o such as a customer premises equipment, connectable to a power supply, to a power-receiving unit such as a curbside electrical/optical interface, when a connection is first established, or the collecting unit is first powered up, or in order to re-establish connection alter a power outage, control signals are transmitted between low-power modems in the interlace units using a low-power communications protocol. This allows the controlled initiation of a larger power output and a higher speed exchange of data once the full telecommunications connection has been established. A low-powered beacon signal is transmitted over the telecommunications connection by the power-collecting telecommunications interface unit on connection to a power supply, for detection by the power-receiving telecommunications interface unit. In the event of a loss of power at the input, the low power modem initiates power management control signals to cause the power-receiving telecommunications interface to shut down certain functions in order to preserve backup power for essential “lifeline” services.