Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent
1987-02-10
1988-10-11
Schreyer, Stafford D.
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of subscriber loop or terminal
379 22, 379 21, 375 10, 324 78R, H04M 322
Patent
active
047776455
ABSTRACT:
A telephone line test and display circuit for enabling a craftsperson to automatically monitor a plurality of communication aspects of a telephone line without impacting any communications that may be taking place over the telephone line being monitored includes a communication capability detection and indicator unit through which the craftsperson may observe the DC operational state (busy/idle, battery polarity, talk battery present) condition of the line by observing a pair of light emitting diodes. The light emitting diodes are color-coded in accordance with operational status conditions being monitored and are illuminated in either a steady state or flashing condition, depending upon the DC state of the line. Also contained with the test and display circuit is a frequency discriminator/display unit, having a set of light emitting diodes separate from those employed for monitoring the DC operational status of the telephone line. The frequency discriminator/indicator unit monitors the line for the presence of communication signals and selectively illuminates an individual one of a set of light emitting diodes, each of which is associated with a prescribed frequency band of signals.
REFERENCES:
patent: 3711661 (1973-01-01), Garett et al.
Curtin Leonard E.
Eckman James D.
Faith Richard W.
Muir Chuck
Harris Corp.
Schreyer Stafford D.
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