Importance

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Abstract

A telephone line communication interface (TLCI) module interfaces a security panel with a phone line of a phone network and comprises receive, transmit and hook control opto-couplers. The receive opto-coupler has receive input and output sides. Receive input side receives a signal on the phone line from the phone network and receive output side conveys the signal to the security panel. Transmit opto-coupler has transmit input and output sides. Transmit input side receives transmit signals from the security panel and the transmit output side conveys the transmit signal to the phone line of the phone network. The transmit output side is joined in parallel with the receive input side of the receive opto-coupler. The hook control opto-coupler has hook input and output sides. The hook input side receives a hook signal from the security panel. The hook output side has hook input and output lines. Hook output line drives a hook switch to convey the hook signal to the phone line of the phone network. Hook output side is joined serially with receive input side of the receive opto-coupler.

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First Claim