JPS6455954A - System for detecting off-hook - Google Patents

System for detecting off-hook

Info

Publication number
JPS6455954A
JPS6455954A JP62213311A JP21331187A JPS6455954A JP S6455954 A JPS6455954 A JP S6455954A JP 62213311 A JP62213311 A JP 62213311A JP 21331187 A JP21331187 A JP 21331187A JP S6455954 A JPS6455954 A JP S6455954A
Authority
JP
Japan
Prior art keywords
telephone set
operator
output
operator call
communication
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP62213311A
Other languages
Japanese (ja)
Inventor
Atsushi Hasegawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP62213311A priority Critical patent/JPS6455954A/en
Publication of JPS6455954A publication Critical patent/JPS6455954A/en
Pending legal-status Critical Current

Links

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  • Facsimile Transmission Control (AREA)

Abstract

PURPOSE:To simplify an operation, to prevent malfunction and to reduce the number of operating switches by constituting a line to be automatically switched to the side of a telephone set when there is an operator call in the middle of communication and the telephone set is hooked off. CONSTITUTION:When there is the operator call from the side of a FAX 1 in the middle of FAX communication, a control part 35 detects the operator call, rings an alarm bell 23a mounted on a console panel 23 so as to inform an operator of it, sends an output (g) to an AND gate 41 so as to open it and starts counting time. When an operator on the side of a FAX2 answers to the operator call and hooks off the telephone set 25, a DC current IL flows through the telephone set 25 by a power source 31, a relay 32 is turned on, and the contact point 32l is closed. The potential of a point (a) is earthed and the Q output of a flip flop 42 shows '1'. Since the AND gate 41 is opened at that time, it sends the output and closes inhibit gates 39 and 40. Thus, relays 36 and 37 are released and the telephone set 25 is connected to a communication line from an exchange network 3 so as to be communicable.
JP62213311A 1987-08-27 1987-08-27 System for detecting off-hook Pending JPS6455954A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62213311A JPS6455954A (en) 1987-08-27 1987-08-27 System for detecting off-hook

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62213311A JPS6455954A (en) 1987-08-27 1987-08-27 System for detecting off-hook

Publications (1)

Publication Number Publication Date
JPS6455954A true JPS6455954A (en) 1989-03-02

Family

ID=16637035

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62213311A Pending JPS6455954A (en) 1987-08-27 1987-08-27 System for detecting off-hook

Country Status (1)

Country Link
JP (1) JPS6455954A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03166852A (en) * 1989-11-27 1991-07-18 Aiwa Co Ltd Line switching device
JPH0788792A (en) * 1992-07-27 1995-04-04 Hiroshi Akashi Air holding device for plate-shaped unit having small hole

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5536698B2 (en) * 1976-10-27 1980-09-22

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5536698B2 (en) * 1976-10-27 1980-09-22

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03166852A (en) * 1989-11-27 1991-07-18 Aiwa Co Ltd Line switching device
JPH0788792A (en) * 1992-07-27 1995-04-04 Hiroshi Akashi Air holding device for plate-shaped unit having small hole

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