JPS5484911A - Protection unit for signal transmission line - Google Patents

Protection unit for signal transmission line

Info

Publication number
JPS5484911A
JPS5484911A JP15377277A JP15377277A JPS5484911A JP S5484911 A JPS5484911 A JP S5484911A JP 15377277 A JP15377277 A JP 15377277A JP 15377277 A JP15377277 A JP 15377277A JP S5484911 A JPS5484911 A JP S5484911A
Authority
JP
Japan
Prior art keywords
demodulator
set value
reception signal
transmission line
signal transmission
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
JP15377277A
Other languages
Japanese (ja)
Inventor
Teruhisa Masayama
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP15377277A priority Critical patent/JPS5484911A/en
Publication of JPS5484911A publication Critical patent/JPS5484911A/en
Pending legal-status Critical Current

Links

Landscapes

  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE: To increase the reliability of line, by reducing the detection speed of line open and detecting the repetitive momentary interruption in a short time, through the supervisory before the reception signal level is fed to the filter, in microwave lines.
CONSTITUTION: The reception signal from the transformer 1 is outputted via the filter 2 and demodulator 3, and the line open detector 4 stops the output of the demodulator 3 when the input level is lower than a given value. Further, the reception signal of the transformer 1 is inputted to the continuity momentary open detector 8, detecting the momentary interruption repeated in a short time according to a given time and number of set value. If it is less than the set value, the output signal of the demodulator 3 is in reset condition and if more than the set value, the output signal of the demodulator 3 is stopped.
COPYRIGHT: (C)1979,JPO&Japio
JP15377277A 1977-12-20 1977-12-20 Protection unit for signal transmission line Pending JPS5484911A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15377277A JPS5484911A (en) 1977-12-20 1977-12-20 Protection unit for signal transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15377277A JPS5484911A (en) 1977-12-20 1977-12-20 Protection unit for signal transmission line

Publications (1)

Publication Number Publication Date
JPS5484911A true JPS5484911A (en) 1979-07-06

Family

ID=15569791

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15377277A Pending JPS5484911A (en) 1977-12-20 1977-12-20 Protection unit for signal transmission line

Country Status (1)

Country Link
JP (1) JPS5484911A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4942207A (en) * 1972-08-16 1974-04-20
JPS5111507A (en) * 1974-07-19 1976-01-29 Nippon Telegraph & Telephone

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4942207A (en) * 1972-08-16 1974-04-20
JPS5111507A (en) * 1974-07-19 1976-01-29 Nippon Telegraph & Telephone

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