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Patent Searching and Data


Title:
CALLING AND AMPLIFYING DEVICE OF SLAVE STATION
Document Type and Number:
Japanese Patent JPS5933964
Kind Code:
A
Abstract:

PURPOSE: To realize the monitor of each slave station, a call between slave stations and a simultaneous command to each slave station, by providing a line transformer circuit having input terminals corresponding to plural slave stations to a master station.

CONSTITUTION: A key S1 is operated to connect a station A and a line transformer circuit 13 during a call with the designated station A. Then a call is carried out by a telephone set 11 via bilateral amplifier circuit 12. When a call is carried out between designated slave stations, the key S1 is operated in response to the output of a monitor amplifier circuit 14 to connect the station A and the circuit 13. Then a key MU2 and an MU contact are operated to connect a station B and the circuit 12. Thus a bilateral call is carried out between stations A and B, and the contents of this call are monitored by the circuit 14. When a simultaneous calling is given to all slave stations from a master station, contents ALL1∼ALLn are actuated to connect all slave stations and the circuit 13. Then a simultaneous command is delivered to each slave station. In addition, it is always possible to monitor all slave stations with operation of a prescribed key.


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Inventors:
SUZUKI RIYOUICHI
Application Number:
JP1982000143831
Publication Date:
February 24, 1984
Filing Date:
August 18, 1982
Export Citation:
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Assignee:
NIPPON ELECTRIC CO
International Classes:
H04M9/00; H04M3/40; (IPC1-7): H04M9/00