| 摘要 |
A phone line selector module used in telecommunications related equipment for automatically sensing and switching back and forth between first and second input ports. The selector module includes a two-piece inter-fitting housing which receives a miniature printed circuit board therein. The miniature printed circuit board is used to mount phone line selector circuitry thereon. The phone line selector circuitry includes a first ring sensing circuit, a second ring sensing circuit, and a latching relay.
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