Trunk interface circuit having function of battery feed to central office
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 7, 2000
Grant Date -
N/A
app pub date -
Mar 11, 1998
filing date -
Jun 19, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A telephone-system interface circuit connected to a central office via a tip line and a ring line includes a battery having a first terminal and a second terminal. A first current control circuit is connected between the tip line and the first terminal of the battery. A second current control circuit is connected between the ring line and the second terminal of the battery. The first current control circuit and the second current control circuit are equal in structure.
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