JPS5718155A - Test leading-in system - Google Patents

Test leading-in system

Info

Publication number
JPS5718155A
JPS5718155A JP9263580A JP9263580A JPS5718155A JP S5718155 A JPS5718155 A JP S5718155A JP 9263580 A JP9263580 A JP 9263580A JP 9263580 A JP9263580 A JP 9263580A JP S5718155 A JPS5718155 A JP S5718155A
Authority
JP
Japan
Prior art keywords
telephone set
test
nonlinear element
subscriber
relay
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
JP9263580A
Other languages
Japanese (ja)
Inventor
Makoto Hisamura
Takao Kobayashi
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.)
Hitachi Ltd
NTT Inc
Original Assignee
Hitachi Ltd
Nippon Telegraph and Telephone 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 Hitachi Ltd, Nippon Telegraph and Telephone Corp filed Critical Hitachi Ltd
Priority to JP9263580A priority Critical patent/JPS5718155A/en
Publication of JPS5718155A publication Critical patent/JPS5718155A/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

Landscapes

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

Abstract

PURPOSE:To easily lead in local and remote tests, by inserting a nonlinear element between a test connecting circuit and a telephone set side line, in a subscriber's circuit of a time division switchboard. CONSTITUTION:A telephone set TEL is connected to a subscriber's circuit SUB through a line L, a nonlinear element SV such as a two-way diode, etc. is inserted into the line, and the element SV transmits a small amplitude AC which has been superposed on DC, but it has a characteristic by which it is cut off in case of only a small amplitude AC. When a contact ta of a test relay TA is closed and a contact tb of a relay TB is opened under control of a testing device TST, DC is supplied to the telephone set TEL from the testing device TST, and a signal is transmitted through the nonlinear element SV, but when a remote test is executed by closing only the contact point ta of the relay TA, DC is not supplied to the telephone set TEL, therefore, the nonlinear element SV shows the impedance which is nearly infinite, and a transmission characteristic test is executed exactly through the subscriber's circuit SUB by the testing device TST.
JP9263580A 1980-07-09 1980-07-09 Test leading-in system Pending JPS5718155A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9263580A JPS5718155A (en) 1980-07-09 1980-07-09 Test leading-in system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9263580A JPS5718155A (en) 1980-07-09 1980-07-09 Test leading-in system

Publications (1)

Publication Number Publication Date
JPS5718155A true JPS5718155A (en) 1982-01-29

Family

ID=14059898

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9263580A Pending JPS5718155A (en) 1980-07-09 1980-07-09 Test leading-in system

Country Status (1)

Country Link
JP (1) JPS5718155A (en)

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