JPS53139413A - Polarity correcting system - Google Patents

Polarity correcting system

Info

Publication number
JPS53139413A
JPS53139413A JP5321077A JP5321077A JPS53139413A JP S53139413 A JPS53139413 A JP S53139413A JP 5321077 A JP5321077 A JP 5321077A JP 5321077 A JP5321077 A JP 5321077A JP S53139413 A JPS53139413 A JP S53139413A
Authority
JP
Japan
Prior art keywords
polarity
correcting system
polarity correcting
main wire
trunk
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
JP5321077A
Other languages
Japanese (ja)
Inventor
Yoshinori Ishida
Juichi Shimamori
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.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu 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 Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Priority to JP5321077A priority Critical patent/JPS53139413A/en
Publication of JPS53139413A publication Critical patent/JPS53139413A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
    • H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
    • H04Q3/625—Arrangements in the private branch exchange

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Dc Digital Transmission (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To secure an automatic change of the polarity for the main wire trunk in correspondence to the polarity of the main wire, by providing a polarity correcting circuit to the main wire trunk in PBX.
JP5321077A 1977-05-11 1977-05-11 Polarity correcting system Pending JPS53139413A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5321077A JPS53139413A (en) 1977-05-11 1977-05-11 Polarity correcting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5321077A JPS53139413A (en) 1977-05-11 1977-05-11 Polarity correcting system

Publications (1)

Publication Number Publication Date
JPS53139413A true JPS53139413A (en) 1978-12-05

Family

ID=12936481

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5321077A Pending JPS53139413A (en) 1977-05-11 1977-05-11 Polarity correcting system

Country Status (1)

Country Link
JP (1) JPS53139413A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60121893A (en) * 1983-12-05 1985-06-29 Nec Corp Polarity automatic switching circuit of trunk-line trunk circuit in automatic-type private branch exchange

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60121893A (en) * 1983-12-05 1985-06-29 Nec Corp Polarity automatic switching circuit of trunk-line trunk circuit in automatic-type private branch exchange

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