专利汇可以提供Ringer power generator circuit for subscriber carrier station terminal专利检索,专利查询,专利分析的服务。并且In a subscriber carrier station terminal including a two-wire drop that is associated with a VF hybrid circuit and a handset thereof, a DC ringer voltage is generated by a DC-DC converter that is powered only during a ringing cycle. Power to drive the ringer in the handset is coupled to the two-wire drop through a pair of back-to-back (decoupling) diodes that are connected to the neutral terminal of the converter and relay contacts that are switched at the central office ringing frequency between +80 volt and -80 volt DC output lines of the converter. The VF hybrid is decoupled from the two-wire drop by a third diode during ringing. The converter is decoupled from the drop circuit by the back-toback diodes when voice signals are on the drop lines. Positive ring trip is provided during a ringing cycle by sensing the current transient produced in the drop when the associated subscriber carrier handset goes off hook in order to turn off the converter for a prescribed time interval to enable establishment of loop current and completion of ring trip.,下面是Ringer power generator circuit for subscriber carrier station terminal专利的具体信息内容。
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