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...http://www.google.de/patents/US6815844?utm_source=gb-gplus-sharePatent US6815844 - Circuit for supplying power to a network termination unit of a message transmission system
