Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent
1994-03-25
1996-04-16
Hofsass, Jeffery
Telephonic communications
Supervisory or control line signaling
Signal reception at substation
379377, 379373, 379418, H04M 126
Patent
active
055090680
ABSTRACT:
An electronic ring monitoring device is disclosed that includes telecommunications interface circuitry, ring detection circuitry, isolation circuitry, and output driver circuitry. The telecommunications interface circuitry may include a switch allowing programmable selection of alternate connections to the telecommunications source depending upon the particular source involved. The ring detection circuitry may include a bridge rectifier, a filtering capacitor, a bleeder resistor to prevent false detection from stray voltages on the telecommunications line, and a variable resistor to allow a programmable detection level. The isolation circuitry may include a optical isolator that will electronically isolate the telecommunications side of the device from the output side of the device. The driver circuitry may include a triac that allows current flow when a ring is indicated and may include inductive load protection circuitry.
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Sprint/North Supply, Telephones and Accessories Catalog, 1993, pp. 122-124 and 129.
Bayless Michael R.
Bayless Samuel R.
Hofsass Jeffery
Saint-Surin Jacques M.
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