DIGITAL SUPERVISORY CIRCUIT FOR A TELEPHONE SYSTEM

DIGITAL SUPERVISORY CIRCUIT FOR A TELEPHONE SYSTEM

The appts. includes a circuit responsive to an impact image signal representing ring trip, ring present, on-hook, off-hook and/or dial pulses. It gives an output signal indicating the difference in time. The input signal is above and below a reference potential. A second circuit digitally integrates...

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1. Verfasser: COCHRAN, WILLIAM T
Format: Patent
Sprache:eng ; kor
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
SELECTING
TELEPHONIC COMMUNICATION
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creator COCHRAN, WILLIAM T
description The appts. includes a circuit responsive to an impact image signal representing ring trip, ring present, on-hook, off-hook and/or dial pulses. It gives an output signal indicating the difference in time. The input signal is above and below a reference potential. A second circuit digitally integrates the output signal. A third circuit has a predetermined digital threshold to provide a ring-present supervisory signal when the threshold is exceeded. A fourth circuit has a second predetermined digital threshold to provide a switch hook supervisory signal when its threshold is exceeded. A fifth circuit prevents response of the second and fourth circuits to line transients.
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It gives an output signal indicating the difference in time. The input signal is above and below a reference potential. A second circuit digitally integrates the output signal. A third circuit has a predetermined digital threshold to provide a ring-present supervisory signal when the threshold is exceeded. A fourth circuit has a second predetermined digital threshold to provide a switch hook supervisory signal when its threshold is exceeded. A fifth circuit prevents response of the second and fourth circuits to line transients.</abstract><edition>4</edition><oa>free_for_read</oa></addata></record>
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subjects ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
SELECTING
TELEPHONIC COMMUNICATION
title DIGITAL SUPERVISORY CIRCUIT FOR A TELEPHONE SYSTEM
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