Customer services terminal method and apparatus for testing...

Details Customer services terminal method and apparatus for testing... Customer services terminal method and apparatus for testing...

2005-03-22

2005-03-22

Kuntz, Curtis (Department: 2643)

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

C379S026020, C379S027010, C379S001010, C379S022000

Reexamination Certificate

active

06870902

ABSTRACT:
Customer services terminal input connected between telephone exchange and outputs. Interface circuits provide service between input and outputs Test means applies test conditions to interface circuits and/or to outputs associated with the interface circuits, and/or to ring/tip pairs associated with interface circuits, and/or to telephone lines associated with interface circuits Other interface circuits service input to other outputs Test means analog-to-digital converter includes reference input, analog measuring input, ground potential input, and test output Normally de-energized calibration relay has normally-closed switches and normally-open switches. Normally-closed switch connects reference voltage to reference input. Another normally-closed switch connects analog measuring input to test means generated voltage. Calibration switching means energizes calibration relay to connect analog measuring input to reference voltage via normally-open switch, to connect reference input to source of ground potential via another normally-open switch to generate calibration output useful for determining test results output when calibration relay is de-energized.

REFERENCES:
patent: 4794632 (1988-12-01), Burton et al.
patent: 5353327 (1994-10-01), Adari et al.

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