JPS6436251A - Line closing control circuit - Google Patents
Line closing control circuitInfo
- Publication number
- JPS6436251A JPS6436251A JP62191706A JP19170687A JPS6436251A JP S6436251 A JPS6436251 A JP S6436251A JP 62191706 A JP62191706 A JP 62191706A JP 19170687 A JP19170687 A JP 19170687A JP S6436251 A JPS6436251 A JP S6436251A
- Authority
- JP
- Japan
- Prior art keywords
- section
- reference voltage
- voltage
- comparison
- telephone circuit
- 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 prevent a malfunction due to noise in a location with deteriorated line state by comparing a line voltage from a telephone circuit with a reference voltage periodically, setting a new reference voltage based on the result of comparison and applying switching control of the telephone circuit based on the comparison output between the new reference voltage and the line voltage from the telephone circuit. CONSTITUTION:A line control section 6 applying switching control of a telephone circuit, a voltage comparison section 2 comparing the line voltage from the telephone circuit with a reference voltage from a reference voltage setting section 3 and a control section 4 are provided. Then the control section 4 is started periodically by the output from a timer section 7, a reference voltage of a reference voltage setting section 3 is adjusted for plural number of times based on the comparison output from the voltage comparison section 2, a voltage control signal is outputted to the section 3 to set a new reference voltage and the new reference voltage is stored in a memory section 5 and the control section 4 controls the line control section 6 based on the comparison output obtained from the voltage comparison section 2 operated by the new reference voltage to apply closing control of the telephone circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62191706A JPS6436251A (en) | 1987-07-31 | 1987-07-31 | Line closing control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62191706A JPS6436251A (en) | 1987-07-31 | 1987-07-31 | Line closing control circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6436251A true JPS6436251A (en) | 1989-02-07 |
Family
ID=16279123
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62191706A Pending JPS6436251A (en) | 1987-07-31 | 1987-07-31 | Line closing control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6436251A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH033865U (en) * | 1989-06-01 | 1991-01-16 |
-
1987
- 1987-07-31 JP JP62191706A patent/JPS6436251A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH033865U (en) * | 1989-06-01 | 1991-01-16 |
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