JPS6436251A - Line closing control circuit - Google Patents

Line closing control circuit

Info

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
Application number
JP62191706A
Other languages
Japanese (ja)
Inventor
Takahisa Kitaguchi
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP62191706A priority Critical patent/JPS6436251A/en
Publication of JPS6436251A publication Critical patent/JPS6436251A/en
Pending legal-status Critical Current

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.
JP62191706A 1987-07-31 1987-07-31 Line closing control circuit Pending JPS6436251A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH033865U (en) * 1989-06-01 1991-01-16

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH033865U (en) * 1989-06-01 1991-01-16

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