Circuit for supplying power to a network termination unit of a message transmission system
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United States of America Patent
Stats
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Nov 9, 2004
Grant Date -
Jun 5, 2003
app pub date -
Dec 24, 2002
filing date -
Mar 22, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
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).
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