JPS6416053A - Terminal equipment removal alarm system for telephone exchange - Google Patents
Terminal equipment removal alarm system for telephone exchangeInfo
- Publication number
- JPS6416053A JPS6416053A JP17088787A JP17088787A JPS6416053A JP S6416053 A JPS6416053 A JP S6416053A JP 17088787 A JP17088787 A JP 17088787A JP 17088787 A JP17088787 A JP 17088787A JP S6416053 A JPS6416053 A JP S6416053A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- line
- telephone set
- detector
- high frequency
- 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
Abstract
PURPOSE:To recognize instantly the removal of a terminal set by applying a high frequency signal at the outside of an audible frequency to one line of terminal connection lines and monitoring a high frequency signal through the other line of the terminal connection lines. CONSTITUTION:When a telephone set A is not busy, the high frequency signal sent rom a signal oscillator 11 of a monitor 13 is detected by a signal detector 12 via a line L1 of an extension line D, the said AC signal path in the telephone set A and a line L2 of the extension line D and a detection signal is outputted to the detector 12. If the telephone set A is removed at the rosette E or a connector F, the high frequency signal from the signal oscillator 11 of the monitor 13 is not detected by the detector 12. Thus, the MPU 10 does not read the signal from the detector 12. Then the MPU 10 discriminates it as the removal of the telephone set A to display the removal of the telephone set A at the reception telephone set G via the control line L4 of the operator circuit 9.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17088787A JPS6416053A (en) | 1987-07-10 | 1987-07-10 | Terminal equipment removal alarm system for telephone exchange |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17088787A JPS6416053A (en) | 1987-07-10 | 1987-07-10 | Terminal equipment removal alarm system for telephone exchange |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6416053A true JPS6416053A (en) | 1989-01-19 |
Family
ID=15913159
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17088787A Pending JPS6416053A (en) | 1987-07-10 | 1987-07-10 | Terminal equipment removal alarm system for telephone exchange |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6416053A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5890860A (en) * | 1981-11-26 | 1983-05-30 | Nec Corp | Telephone set connection confirming system |
JPS6238066A (en) * | 1985-08-12 | 1987-02-19 | Oki Electric Ind Co Ltd | System for supervising telephone set connecting state |
-
1987
- 1987-07-10 JP JP17088787A patent/JPS6416053A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5890860A (en) * | 1981-11-26 | 1983-05-30 | Nec Corp | Telephone set connection confirming system |
JPS6238066A (en) * | 1985-08-12 | 1987-02-19 | Oki Electric Ind Co Ltd | System for supervising telephone set connecting state |
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