Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent
1989-09-21
1992-11-03
Dwyer, James L.
Telephonic communications
Subscriber line or transmission line interface
Protective circuit
361119, 361 91, 379331, 379413, H02H 904, H04M 700
Patent
active
051611830
ABSTRACT:
An overvoltage protection circuit for a pair of conductors carrying a balanced signal includes two similar protection elements connected in series between the conductors and two equal value resistors respectively connected in parallel with the elements, so that the junction point of the two elements is at a voltage midway between the voltages on the conductors and the protection elements present equal capacitances to the conductors. A third protection element is connected from the junction point of the two elements to ground to protect against excessive voltages relative to ground on the conductors. The voltage division provided by the resistors may be adjusted to improve the balance of the capacitances presented by the two protection elements.
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Baumann Russell E.
Donaldson Richard L.
Dwyer James L.
Grossman Rene E.
Shehata Magdy W.
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