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US 6,144,737 AGranted
Trunk interface circuit having function of battery feed to central office
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKenichi Maruyama, Masami Nashirozawa
Life of this patent
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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.
Claims3
A telephone-system interface circuit connected to a central office via a tip line and a ring line, comprising:
- a battery having a first terminal and a second terminal;
- a first current control circuit connected between the tip line and the first terminal of the battery;
- and
- a second current control circuit connected between the ring line and the second terminal of the battery;
- wherein the first current control circuit and the second current control circuit are equal in structure.
2 more elements
Dependencies are inferred from the claim text.