Telephone and data overvoltage protection apparatus including a longitudinal transformer
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United States of America Patent
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May 18, 1999
Grant Date -
N/A
app pub date -
May 27, 1997
filing date -
May 27, 1997
priority date (Note) -
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Abstract
A method and apparatus are provided for protecting a pair of telephone lines and similar data communication channels from overvoltage and transients. A filter for filtering noise and transient voltage signals above desired data signals on telephone lines and similar data communication channels includes a longitudinal transformer. The longitudinal transformer includes a single transformer core and a pair of coils. A first one of the coils is connected in series with a first telephone line or a first similar data communication channel. A second one of the coils is connected in series with a second telephone line or a second similar data communication channel. The pair of coils are substantially identical; each coil having an identical number of turns. A high impedance is provided with the longitudinal transformer to noise and transient voltage signals above desired data signals. A low impedance is provided with the longitudinal transformer to desired data signals.
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