Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Using portable test set
Patent
1991-10-04
1992-10-20
Schreyer, Stafford D.
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Using portable test set
324556, H04M 330, H04M 326
Patent
active
051577089
ABSTRACT:
A handheld battery-powered telecommunications test instrument for monitoring the status of a pair of wires. A tone-generating circuit generates a tone signal in response to the user manually selecting operation in a tone-generating mode. The instrument monitors the pair of wires to determine whether an on-hook, off-hook or ringing signal is present on the wires, and if present, generates an interrupt control signal through a microprocessor. Logic circuitry connected to the microprocessor results in connecting and disconnecting the tone-generating circuit and the pair of wires to selectively apply the tone signal to the wires. In response to the control signal and the user selecting the tone-generating mode, the microprocessor connects the tone-generation circuit to the pair of wires if no control signal is generated, and disconnects the tone-generating circuit if the control signal is generated. The presence of the on-hook, off-hook and ringing signals on the pair of wires is determined by measuring the voltage between the pair of wires. A menu is generated by the microprocessor from which the user can select the frequency and amplitude for the tone signal.
REFERENCES:
patent: 3870836 (1975-03-01), Kusama
patent: 4682346 (1987-07-01), Faith et al.
patent: 4691336 (1987-09-01), Durston
Catalog, Progressive Electronics, Inc., Mar., 1989.
Garthwaite John H.
Rollins David M.
Stocklin Clay A.
Leviton Manufacturing Co. Inc.
Schreyer Stafford D.
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