H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/16
H04M 11/00 (2006.01)
Patent
CA 1309525
ABSTRACT OF THE DISCLOSURE An automatic telecommunication system includes a central location and at least one remote location where a data reporting system including a modem is situated. The cen- tral location establishes communications over the switched telephone network to the modem coupled to a tel- ephone line at the remote location. At least one tele- phone handset is also connected to the telephone line at the remote location. Circuitry is provided for suppress- ing ringing of the telephone handset when the central location initiates a call to the modem at the remote location. The circuitry includes a microprocessor for controlling the modem to respond to incoming ringing sig- nals on the telephone line only during a predetermined time window. The circuitry also includes an arrangement for detecting a ringing signal on the telephone line and delivering an input to the microprocessor indicating ringing. The microprocessor delivers an output if the ringing occurs during the predetermined time window. Circuitry is responsive to the microprocessor output to drive the modem to go off - hook. A circuit driven by the microprocessor establishes a load across the tele- phone line when the modem goes off - hook for a predeter- mined time period to essentially short circuit the tele- phone line for a period of time sufficient to allow ring trip on the telephone line, thereby preventing any ring- ing of telephone handsets connected to the telephone line.
595811
Macrae & Co.
Peac Media Research Inc.
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