SE7907752L - TEST EQUIPMENT FOR TELEPHONE WIRES - Google Patents

TEST EQUIPMENT FOR TELEPHONE WIRES

Info

Publication number
SE7907752L
SE7907752L SE7907752A SE7907752A SE7907752L SE 7907752 L SE7907752 L SE 7907752L SE 7907752 A SE7907752 A SE 7907752A SE 7907752 A SE7907752 A SE 7907752A SE 7907752 L SE7907752 L SE 7907752L
Authority
SE
Sweden
Prior art keywords
tip
ground
ring
measurements
test equipment
Prior art date
Application number
SE7907752A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE435775B (en
Inventor
J C Ellson
Original Assignee
Northern Telecom 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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Publication of SE7907752L publication Critical patent/SE7907752L/en
Publication of SE435775B publication Critical patent/SE435775B/en

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)
  • Measurement Of Resistance Or Impedance (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

A test set for measuring line characteristics for a telephone line having tip and ring leads to enable calculation of the leakage resistances, the line capacitances and the spurious voltages between tip and ground, ring and ground, and tip and ring directly from the measurements, comprises means for applying three successive d-c voltage states from tip to ground, and ring to ground respectively; and means for separately measuring the steady state current flowing to the tip and ring leads during each of the three states, each of the three successive voltage states being applied from tip to ground and ring to ground through first and second reference resistors respectively; and means for separately measuring the transient charge flowing through the first and second resistors to the tip and ring leads respectively. These measurements are used by a computer, controlling the set, to calculate said characteristics.
SE7907752A 1978-09-21 1979-09-19 TEST EQUIPMENT FOR TELEPHONE WIRES SE435775B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA311,757A CA1092653A (en) 1978-09-21 1978-09-21 Method and apparatus for measuring telephone line

Publications (2)

Publication Number Publication Date
SE7907752L true SE7907752L (en) 1980-03-22
SE435775B SE435775B (en) 1984-10-15

Family

ID=4112404

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7907752A SE435775B (en) 1978-09-21 1979-09-19 TEST EQUIPMENT FOR TELEPHONE WIRES

Country Status (8)

Country Link
JP (1) JPS5542495A (en)
AT (1) AT384698B (en)
CA (1) CA1092653A (en)
DE (1) DE2936722A1 (en)
FR (1) FR2436999A1 (en)
GB (1) GB2031248B (en)
NL (1) NL7906671A (en)
SE (1) SE435775B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0744604B2 (en) * 1985-05-17 1995-05-15 日本電気株式会社 Subscriber line monitoring circuit
GB2269073B (en) * 1992-07-23 1996-06-19 Northern Telecom Ltd Remote line tester
GB9613287D0 (en) * 1996-06-25 1996-08-28 Raychem Ltd Ground testing

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028507A (en) * 1976-06-28 1977-06-07 Bell Telephone Laboratories, Incorporated Apparatus for applying particular voltages to three-terminal circuits and measuring resulting current flows for the purpose of determining circuit characteristics

Also Published As

Publication number Publication date
CA1092653A (en) 1980-12-30
DE2936722A1 (en) 1980-04-10
AT384698B (en) 1987-12-28
JPS5542495A (en) 1980-03-25
NL7906671A (en) 1980-03-25
GB2031248A (en) 1980-04-16
ATA606579A (en) 1987-05-15
FR2436999A1 (en) 1980-04-18
GB2031248B (en) 1982-12-22
FR2436999B1 (en) 1983-07-01
SE435775B (en) 1984-10-15
JPS6322111B2 (en) 1988-05-10

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