Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1998-03-11
2000-11-07
Dorvil, Richemond
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379324, 379322, 379231, 379323, 361119, H04M 1900
Patent
active
061447374
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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Maruyama Kenichi
Nashirozawa Masami
Chawan Vijay B
Dorvil Richemond
Matsushita Electric - Industrial Co., Ltd.
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