JPS56128057A - Automatic circuit supervisory unit - Google Patents

Automatic circuit supervisory unit

Info

Publication number
JPS56128057A
JPS56128057A JP3197580A JP3197580A JPS56128057A JP S56128057 A JPS56128057 A JP S56128057A JP 3197580 A JP3197580 A JP 3197580A JP 3197580 A JP3197580 A JP 3197580A JP S56128057 A JPS56128057 A JP S56128057A
Authority
JP
Japan
Prior art keywords
signal
specific frequency
constant period
automatic circuit
subscriber
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
JP3197580A
Other languages
English (en)
Inventor
Kazuyoshi Yokoo
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
Nippon Electric Co Ltd
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, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP3197580A priority Critical patent/JPS56128057A/ja
Publication of JPS56128057A publication Critical patent/JPS56128057A/ja
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
    • H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
JP3197580A 1980-03-13 1980-03-13 Automatic circuit supervisory unit Pending JPS56128057A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3197580A JPS56128057A (en) 1980-03-13 1980-03-13 Automatic circuit supervisory unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3197580A JPS56128057A (en) 1980-03-13 1980-03-13 Automatic circuit supervisory unit

Publications (1)

Publication Number Publication Date
JPS56128057A true JPS56128057A (en) 1981-10-07

Family

ID=12345945

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3197580A Pending JPS56128057A (en) 1980-03-13 1980-03-13 Automatic circuit supervisory unit

Country Status (1)

Country Link
JP (1) JPS56128057A (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01225272A (ja) * 1988-03-04 1989-09-08 Nippon Telegr & Teleph Corp <Ntt> 電話加入者回線の断線監視方式

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01225272A (ja) * 1988-03-04 1989-09-08 Nippon Telegr & Teleph Corp <Ntt> 電話加入者回線の断線監視方式

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