JPS56132851A - Four-wire monitoring system - Google Patents

Four-wire monitoring system

Info

Publication number
JPS56132851A
JPS56132851A JP3654980A JP3654980A JPS56132851A JP S56132851 A JPS56132851 A JP S56132851A JP 3654980 A JP3654980 A JP 3654980A JP 3654980 A JP3654980 A JP 3654980A JP S56132851 A JPS56132851 A JP S56132851A
Authority
JP
Japan
Prior art keywords
wire system
main channel
wire
lines
channel network
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.)
Granted
Application number
JP3654980A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6355267B2 (enrdf_load_stackoverflow
Inventor
Kunihiko Fujiwara
Shigeru Akiyama
Mutsuo Ezaka
Kozo Nakamura
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.)
JAPANESE NATIONAL RAILWAYS<JNR>
Fujitsu Ltd
Japan National Railways
Original Assignee
JAPANESE NATIONAL RAILWAYS<JNR>
Fujitsu Ltd
Japan National Railways
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 JAPANESE NATIONAL RAILWAYS<JNR>, Fujitsu Ltd, Japan National Railways filed Critical JAPANESE NATIONAL RAILWAYS<JNR>
Priority to JP3654980A priority Critical patent/JPS56132851A/ja
Publication of JPS56132851A publication Critical patent/JPS56132851A/ja
Publication of JPS6355267B2 publication Critical patent/JPS6355267B2/ja
Granted 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
    • H04M3/32—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for lines between exchanges

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Exchange Systems With Centralized Control (AREA)
JP3654980A 1980-03-22 1980-03-22 Four-wire monitoring system Granted JPS56132851A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3654980A JPS56132851A (en) 1980-03-22 1980-03-22 Four-wire monitoring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3654980A JPS56132851A (en) 1980-03-22 1980-03-22 Four-wire monitoring system

Publications (2)

Publication Number Publication Date
JPS56132851A true JPS56132851A (en) 1981-10-17
JPS6355267B2 JPS6355267B2 (enrdf_load_stackoverflow) 1988-11-01

Family

ID=12472840

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3654980A Granted JPS56132851A (en) 1980-03-22 1980-03-22 Four-wire monitoring system

Country Status (1)

Country Link
JP (1) JPS56132851A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58168367A (ja) * 1982-03-29 1983-10-04 Fujitsu Ltd トランク監査方式

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4965715A (enrdf_load_stackoverflow) * 1972-10-25 1974-06-26
JPS5092004A (enrdf_load_stackoverflow) * 1973-12-12 1975-07-23

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4965715A (enrdf_load_stackoverflow) * 1972-10-25 1974-06-26
JPS5092004A (enrdf_load_stackoverflow) * 1973-12-12 1975-07-23

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58168367A (ja) * 1982-03-29 1983-10-04 Fujitsu Ltd トランク監査方式

Also Published As

Publication number Publication date
JPS6355267B2 (enrdf_load_stackoverflow) 1988-11-01

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