Coin telephone station simulator and condition indicator

Details Coin telephone station simulator and condition indicator Coin telephone station simulator and condition indicator

1976-03-30

1977-05-10

Olms, Douglas W.

1791752R, 179 63R, H04M 326

Patent

active

040229874

ABSTRACT:
A coin telephone station simulator and condition indicator. Separate tip, ring, and ground input/output conditioners are provided for connection to a telephone system for test. A controllable coin present relay simulator circuit is switchable from a first high impedance condition to a second lower impedance condition in between tip and ground conductors. A coin test switch switches the controllable relay simulator circuit from the first to the second condition. A coin present indicator is provided together with means for energizing the coin present indicator when the simulator circuit is in the second lower impedance condition. Coin collect and coin return indicators are provided. A coin collect and return detection circuit is responsive to first and second electrical signals, of opposite polarity, momentarily and separately applied in between the tip and ground conductors for individually energizing, respectively, the coin collect and coin return indicators. Low, acceptable and high voltage indicators are provided. A line voltage detector circuit is responsive to an electrical signal applied between the tip and ring conductors of below a first voltage level for enabling the low indicator and is responsive to a signal above a second voltage level for enabling the high indicator and is responsive to a signal with a voltage level of in between the first and second levels for enabling the acceptable indicator.

REFERENCES:
patent: 2795657 (1957-06-01), Boyd
patent: 2820847 (1958-01-01), King
patent: 3496300 (1970-02-01), Stokes

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