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Circuit for supplying power to a network termination unit of a message transmission system

  • US 6,815,844 B2
  • Filed: 12/24/2002
  • Issued: 11/09/2004
  • Est. Priority Date: 03/22/2000
  • Status: Expired due to Fees
First Claim
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1. A circuit for supplying power to a network termination unit of a message transmission system, which is connected to a central station via a subscriber line, said central station including a remote power supply source that supplies power during an emergency operating state, the network termination unit comprising:

  • a local power supply voltage source that supplies power during a normal operating state, a direct current converter with a transformer having a clocked switch and a primary winding, which is connected via the clocked switch to the local power supply voltage source, and a first controllable switch, wherein a terminal of the primary winding is connected via the first controllable switch to a wire of the subscriber line.

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