JPS54128608A - Line test system for four wire type exchanger - Google Patents

Line test system for four wire type exchanger

Info

Publication number
JPS54128608A
JPS54128608A JP3722578A JP3722578A JPS54128608A JP S54128608 A JPS54128608 A JP S54128608A JP 3722578 A JP3722578 A JP 3722578A JP 3722578 A JP3722578 A JP 3722578A JP S54128608 A JPS54128608 A JP S54128608A
Authority
JP
Japan
Prior art keywords
circuit
line
hybrid
wire
hxb
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
JP3722578A
Other languages
Japanese (ja)
Inventor
Yoshirou Nishimura
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 JP3722578A priority Critical patent/JPS54128608A/en
Publication of JPS54128608A publication Critical patent/JPS54128608A/en
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
    • H04M3/302—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop using modulation techniques for copper pairs
    • H04M3/303—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop using modulation techniques for copper pairs and using PCM multiplexers, e.g. pair gain systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

PURPOSE:To enable to know the condition of connecting lines, by controlling the impedance alteration circuit and measuring circuit of hybrid with the control and testing the lines to each subscriber line. CONSTITUTION:The impdance alteration circuit IMP of hybrid is provided at the line output of the two wire and four wire conversion circuit HXB, and the test signal generator OSC and the output measuring circuit M inverted with the two and four wire conversion circuit HXB are connected at the time sharing communication line TDSW, and the circuit IMP and the measuring circuit M are controlled with the control circuit CONT. Thus, the line test is made to each suscriber SUB line under non-operation. Moreover, the balance of hybrid is temporarily unbalanced, reflection is made with hybrid, and the reflected outpput is measured, allowing to know the condition of connecting line.
JP3722578A 1978-03-29 1978-03-29 Line test system for four wire type exchanger Pending JPS54128608A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3722578A JPS54128608A (en) 1978-03-29 1978-03-29 Line test system for four wire type exchanger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3722578A JPS54128608A (en) 1978-03-29 1978-03-29 Line test system for four wire type exchanger

Publications (1)

Publication Number Publication Date
JPS54128608A true JPS54128608A (en) 1979-10-05

Family

ID=12491645

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3722578A Pending JPS54128608A (en) 1978-03-29 1978-03-29 Line test system for four wire type exchanger

Country Status (1)

Country Link
JP (1) JPS54128608A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02230853A (en) * 1988-11-28 1990-09-13 American Teleph & Telegr Co <Att> Apparatus and method for remote test of metallic loop

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02230853A (en) * 1988-11-28 1990-09-13 American Teleph & Telegr Co <Att> Apparatus and method for remote test of metallic loop

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