JPS5488007A - Polarity confirmation system for public telephone set - Google Patents

Polarity confirmation system for public telephone set

Info

Publication number
JPS5488007A
JPS5488007A JP15551577A JP15551577A JPS5488007A JP S5488007 A JPS5488007 A JP S5488007A JP 15551577 A JP15551577 A JP 15551577A JP 15551577 A JP15551577 A JP 15551577A JP S5488007 A JPS5488007 A JP S5488007A
Authority
JP
Japan
Prior art keywords
telephone set
public telephone
earth
polarity
confirmation system
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
JP15551577A
Other languages
Japanese (ja)
Other versions
JPS5612065B2 (en
Inventor
Noboru Matsumura
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.)
NTT Inc
Original Assignee
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP15551577A priority Critical patent/JPS5488007A/en
Publication of JPS5488007A publication Critical patent/JPS5488007A/en
Publication of JPS5612065B2 publication Critical patent/JPS5612065B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Prepayment Telephone Systems (AREA)

Abstract

PURPOSE:To secure the detection of the line polarity through the test board at the office side by connecting the capacitor previously between the line of one side and the earth. CONSTITUTION:Capacitor CX is inserted under the on-hook state between the earth and L1 among line L1 and L2 connected to the main wire, and then connected so as to be cut off under the off-hook state. Then the electrostatic capacity between the earth and L1 or L2 is measured and compared at the office side, thus ensuring the polarity identification for the telephone circuit.
JP15551577A 1977-12-26 1977-12-26 Polarity confirmation system for public telephone set Granted JPS5488007A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15551577A JPS5488007A (en) 1977-12-26 1977-12-26 Polarity confirmation system for public telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15551577A JPS5488007A (en) 1977-12-26 1977-12-26 Polarity confirmation system for public telephone set

Publications (2)

Publication Number Publication Date
JPS5488007A true JPS5488007A (en) 1979-07-12
JPS5612065B2 JPS5612065B2 (en) 1981-03-18

Family

ID=15607732

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15551577A Granted JPS5488007A (en) 1977-12-26 1977-12-26 Polarity confirmation system for public telephone set

Country Status (1)

Country Link
JP (1) JPS5488007A (en)

Also Published As

Publication number Publication date
JPS5612065B2 (en) 1981-03-18

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