Terminal connection device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 12, 1993
Grant Date -
N/A
app pub date -
Jul 1, 1991
filing date -
Jul 4, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A terminal connection device changes and connects a plurality of terminals to one telephone line according to kinds of ringing signal sequences sent through the telephone line. The terminal connection device comprises switches connecting between the telephone line and the terminals, a control circuit commanding ON/OFF operation of the switches, and a photo coupler converting the ringing signal obtained through the telephone line into light signal and inputting the light signal to the control circuit. The control circuit includes a device for judging as to whether a ringing signal sequence sent through the telephone line is the same as the sequence data or not.
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Cited Art Landscape
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