JPS6455954A - System for detecting off-hook - Google Patents
System for detecting off-hookInfo
- 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
Links
Landscapes
- 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.
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5536698B2 (en) * | 1976-10-27 | 1980-09-22 |
-
1987
- 1987-08-27 JP JP62213311A patent/JPS6455954A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5536698B2 (en) * | 1976-10-27 | 1980-09-22 |
Cited By (2)
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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