Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Using portable test set
Reexamination Certificate
1999-04-07
2001-01-09
Nguyen, Duc (Department: 2743)
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Using portable test set
C379S377000, C379S381000, C379S382000, C379S396000
Reexamination Certificate
active
06173040
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a telephone line state detecting device that primarily detects whether a telephone line is generating pulses to determine whether the telephone line is disconnected or the electrical contact thereof is poor, or whether the telecommunications equipment used in conjunction therewith is busy or not in use.
(b) Description of the Prior Art:
The major function of a telephone line is to convert signals and to enable the user to communicate with the outside. However, the conventional telephone line in general can only let the user know whether a telephone call is successfully connected. The user is unable to know the state of the telephone line or the use status thereof.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide a telephone line state detecting device that includes a hardware detecting circuit provided in a telephone line connected to a modem. The hardware detecting circuit is connected to a processing unit. In use, the hardware detecting circuit detects pulses generated by voltages flowing through the telephone line, which are processed by the processing unit to determine whether the line is interrupted or electrical contact thereof is poor, or whether the telecommunication equipment used in conjunction therewith is busy or not in use.
Another object of the present invention is to provide a telephone line state detecting device that includes a processing unit provided with a ROM for storing relevant data. After processing the pulses generated by the voltages flowing through the telephone line, the processing unit can, based upon the data stored in the ROM, determine whether or not to actuate the hardware detecting circuit.
REFERENCES:
patent: 4600810 (1986-07-01), Feldman et al.
patent: 4686700 (1987-08-01), Perry
patent: 4734933 (1988-03-01), Barsellotti et al.
patent: 5218616 (1993-06-01), Stephens
patent: 5668870 (1997-09-01), Dahlquist
patent: 5706342 (1998-01-01), Beader et al.
Dougherty & Troxell
Nguyen Duc
Well Communication Co.
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