Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1988-12-21
1990-10-02
Schreyer, Stafford D.
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379442, 323223, H04M 1900
Patent
active
049612204
ABSTRACT:
A telephone device, typically a terminal, that receives a.c. communication signals and that sinks d.c. current to provide the off-hook signal is powered from (i) the telephone lines and, if line voltage is less than 7.4 v.d.c., from (ii) a 6 v.d.c. battery. Connection to telephone lines of voltage greater than 7.4 v.d.c. recharges the battery. The terminal further contains a CMOS microprocessor that may be declocked and placed in standby mode to conserve power. When so placed, the microprocessor maintains some of its signal lines at a logic High, 6 v.d.c., condition. In order to both unpower circuits such as a display, a memory, a DTMF dialer, and a modem to which the microprocessor signal lines connect, and to (ii) disrupt current leakage paths from the signal lines to ground through the unpowered circuits, the ground is removed from the circuits. This removal, controlled by a signal from the standby microprocessor, is performed by a transistor switch.
REFERENCES:
patent: 4803719 (1989-02-01), Ulrich
Hightower Michael L.
Tentler Michael L.
Schreyer Stafford D.
Spectrum Concepts Inc.
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