Abstract: A circuit arrangement for remotely powering a plurality of local systems, such as network termination units used, for example, with ISDN, from a central unit which itself is remotely powered and a corresponding method for remotely powering the local systems are described. The circuit arrangement includes a power converter receiving remote power from a central exchange, with a processing circuit connected downstream. The power converter provides a supply voltage to the local systems via a first current path and an energy storage unit provides the startup energy the local systems. Switches arranged between the energy storage unit and the local systems individually connect different local systems to the energy storage unit via a second current path. Only a single small energy storage unit is required to supply the startup power.

Abstract: The invention relates to a circuit for supplying power to a network termination unit (55) of a message transmission system, which is connected to a central station via a subscriber line (30). A local power supply voltage source (41), which is arranged in the network termination unit (55) and which supplies power during a normal operating state, is provided as well as a remote power supply source, which is arranged in the central station and which supplies power during an emergency operating state in the case of a failure or malfunctioning of the local power supply voltage source (41). The network termination unit (55) comprises a direct current converter with a transformer and a clocked switch (20). The primary winding (1) of the transformer is connected via the clocked switch (20) to the local power supply voltage source (41), and a connection of the primary winding (1) is connected via a first controllable switch (5) to a wire of the subscriber line (30).