Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent
1987-02-12
1988-05-03
Dwyer, James L.
Telephonic communications
Supervisory or control line signaling
Using line or loop condition detection
379387, H04M 1902
Patent
active
047425393
ABSTRACT:
An improvement to automatic answering and call forwarding features used in telephone communications which allows a user to remotely activate, modify, and deactivate these features. The improvement describes a transformerless means for coupling signals to and from the telephone line without compromising the operation of the telephone line. The apparatus employs a microprocessor controller (11) with memory (12), a tone encoder (15), a toner decoder (14), a voice synthesizer (16), a timer (13), a cassette interface (17), an RS232C interface (20), a switching matrix (21), and a line interface (22). Audio, pulse dial, and tone signals are routed among the components and the telephone line (51) by the switching matrix (21) and line interface (22). The line interface (22) provides a transformerless means for coupling signals to and from the telephone line (51) and also analyzes the status of, and signals present on, the telephone line (51).
REFERENCES:
patent: 4063045 (1977-12-01), Greischar
patent: 4440981 (1984-04-01), Grantland et al.
patent: 4475009 (1984-10-01), Rais et al.
Dwyer James L.
Melita Electronic Labs, Inc.
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