The invention relates to a system which includes: a plurality of batteries (B1, B2) connected in parallel by a pair of first (1.sup.+) and second (1.sup.) power conductor, each battery being connected to a device (BMS1, BMS2) for managing the battery; a device (EMS) for global energy management; a generator (101) suitable for applying an alternating signal to the power conductors (1.sup.+, 1.sup.); and a plurality of transmitter-receiver circuits (M) respectively connected to the various management devices (EMS, BMS1, BMS2), each transmitter-receiver circuit (M) being connected to the power conductor (1.sup.+, 1.sup.) and being suitable, in order to transmit data, for switching the impedance thereof between the power conductors (1.sup.+, 1.sup.) between two states, and, in order to receive data to detect whether a value representing the amplitude of the alternating signal on said power conductors (1.sup.+, 1.sup.) is higher or lower than a threshold.

The present disclosure is an optical line switching node device N which includes an optical switch part 2 which performs optical path switching between communication optical fibers F-0, F-1; a communication optical signal extraction part 5-0, 5-1 which extracts some of communication optical signals from one or both of the communication optical fibers F-0, F-1 and photoelectrically converts the extracted some of the communication optical signals; and a communication optical signal storage part 6 which stores some of communication optical signals photoelectrically converted in the communication optical signal extraction part 5-1, 5-1 and uses the stored energy to drive the optical switch part 2.

The disclosure provides a monitoring control device and an optical power supply system in which a system capable of remotely controlling many optical power supply type optical nodes can be economically constructed. A monitoring control device according to the present disclosure includes control means for executing power supply and power supply time allocation for selecting a control target optical node based on the amount of stored energy of a plurality of optical nodes. According to the present disclosure, in a system that includes a monitoring control device installed in a power supply environment and one or a plurality of remotely arranged optical line switching nodes, optical power supply and control of a plurality of optical switches included in the nodes and management of an amount of stored power can be simultaneously implemented with a single laser. Thus, it is possible to provide an economical optical line switching node system.