Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent
1997-05-02
2000-12-12
Isen, Forester W.
Telephonic communications
Subscriber line or transmission line interface
Protective circuit
361119, H04M 900, H02H 322
Patent
active
061608874
ABSTRACT:
A loop-current regulator for protecting terminal telephone equipment coupled to telephone lines from high telephone line loop-current. The loop-current regulator has a current regulator for protecting the terminal telephone equipment from excess power generated by current signals which pass through the telephone lines to the terminal telephone equipment. A signal network circuit is coupled to the current regulator for providing an alternating current (AC) path for AC signals to pass by the current regulator while minimizing attenuation of the AC signals. A bridge rectifier circuit is coupled to the current regulator, the signal network circuit, and the telephone lines for allowing the current signals to pass in only a single direction through the current regulator and the signal network circuit regardless of the polarity of the telephone lines. A surge protection circuit is coupled to the bridge rectifier circuit and to the telephone lines for protecting the terminal telephone equipment form line-to-line surges.
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Davis Paul W.
Isen Forester W.
Moy Jeffrey D.
Pendleton Brian Tyrone
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