Digital transmission equipment
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United States of America Patent
Stats
-
May 30, 1995
Grant Date -
N/A
app pub date -
May 3, 1993
filing date -
May 11, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Digital termination equipment for use in signal transmission over a 2-wire subscriber line through an interface transformer includes an impedance unit functionally provided between the 2-wire subscriber line and the interface transformer for generating a high impedance when a current more than a predetermined current value flows therein. A power supply unit is provided having first and second terminals. The first terminal is connected to a winding of the interface transformer for supplying a voltage to the impedance unit through the winding. A current path forming circuit is connected to the impedance unit and to the second terminal of the power supply unit for forming a current path between the impedance unit and the second terminal of the power supply unit when a voltage more than a predetermined voltage value is applied. The power supply unit includes a dc power source and a switch connected in series to the dc power source. The switch is turned on when a local loopback testing is executed.
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