Telephone and data overvoltage protection apparatus

Details Telephone and data overvoltage protection apparatus Telephone and data overvoltage protection apparatus

H - Electricity

02

H

323/6, 379/67

H02H 9/04 (2006.01)

Patent

CA 1286812

TELEPHONE AND DATA OVERVOLTAGE PROTECTION APPARATUS Abstract of the Disclosure Overvoltage protection circuits are provided for coupling a subscriber's station to first and second conductors connected to a telephone system or other similar communications source. The overvoltage protec- tion circuits include first circuitry connected between the first and second conductors for conducting current at a first breakdown voltage and for blocking current below the first breakdown voltage; second circuitry for conducting current at a second breakdown voltage and for blocking current below the second breakdown voltage; and circuitry connected in series between the first and second circuitry for filtering voltage signals on the first and second conductors responsive to the second circuitry conducting current. The over- voltage protection circuits are effective for suppress- ing noise and transient voltage signals occurring above the data signal and do not require a transient voltage signal to exceed the ring signal for operation.

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