Detection and display of data and voice signals on telephone lines and automatic line shorting device

摘要

More particularly, the present invention relates to a data communication detection unit (1), a voice communication detection unit (2), and a communication mode display unit (3) Commonly, when various communication devices such as telephone, modem, and fax are connected in parallel, it detects the signal and shows the signal form so that the person who wants to use the communication device knows beforehand how the line is used A serial off-hook detector 5 for detecting a voice call state in the above-mentioned configuration; A switching signal generator 6 for generating a communication device short-circuit control signal, a switch controller 7 and a switching unit 8 for determining whether to short-circuit a telephone line connected to the communication device 4, By lifting or off-hooking the handset of the telephone to use this line, the line to be input to other communication devices connected in parallel is automatically short-circuited, thereby preventing unexpected interference to the communication.