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Process for deteccao of busy during the call signal and the use of a subscriber line interface circuit for deteccao of busy during the call sign
Process for deteccao of busy during the call signal and the use of a subscriber line interface circuit for deteccao of busy during the call sign
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机译:用于在呼叫信号期间检测忙碌的过程以及使用用户线接口电路在呼叫信号期间检测忙碌的过程
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摘要
A method and an apparatus for off-hook detection in a subscriber line interface circuit responds to a ringing signal which preferably lacks a DC component. A signal is generated that is a function of the line current through the subscriber line, and the time at which the signal exceeds a predetermined current value is measured. The measured time is compared with a predetermined time value, and an off-hook indication is produced in a processor depending on the comparison.
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