JPS54146905A - Main wire two-way trunk - Google Patents

Main wire two-way trunk

Info

Publication number
JPS54146905A
JPS54146905A JP5453478A JP5453478A JPS54146905A JP S54146905 A JPS54146905 A JP S54146905A JP 5453478 A JP5453478 A JP 5453478A JP 5453478 A JP5453478 A JP 5453478A JP S54146905 A JPS54146905 A JP S54146905A
Authority
JP
Japan
Prior art keywords
current
main wire
winding
way trunk
tertiary
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
JP5453478A
Other languages
Japanese (ja)
Other versions
JPS571959B2 (en
Inventor
Shige Miyoshi
Shiro Enami
Hirotoshi Shirasu
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
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP5453478A priority Critical patent/JPS54146905A/en
Publication of JPS54146905A publication Critical patent/JPS54146905A/en
Publication of JPS571959B2 publication Critical patent/JPS571959B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/0096—Trunk circuits

Abstract

PURPOSE:To constitute a monitor circuit economically by providing a tertiary winding in a coupling transformer to cancel the DC current flowing to the primary winding and the secondary winding and utilizing the current of the tertiary winding in the main wire two-way trunk of a private branch telephone exchange. CONSTITUTION:When a current is flowed to coupling transformer TH, Hall element H detects the DC current and drives control circuit CTL and controls transistors Q0 and Q1 to flow a current to tertiary windings 3-4 and 4-5 so that the DC current flowing to transformer TH may be cancelled. At this time, the state of transistors Q0 and Q1 is taken out by terminals SN0 and SN1, thereby detecting a state where the exchange is.
JP5453478A 1978-05-10 1978-05-10 Main wire two-way trunk Granted JPS54146905A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5453478A JPS54146905A (en) 1978-05-10 1978-05-10 Main wire two-way trunk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5453478A JPS54146905A (en) 1978-05-10 1978-05-10 Main wire two-way trunk

Publications (2)

Publication Number Publication Date
JPS54146905A true JPS54146905A (en) 1979-11-16
JPS571959B2 JPS571959B2 (en) 1982-01-13

Family

ID=12973323

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5453478A Granted JPS54146905A (en) 1978-05-10 1978-05-10 Main wire two-way trunk

Country Status (1)

Country Link
JP (1) JPS54146905A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57104862U (en) * 1980-12-19 1982-06-28
US4361732A (en) * 1981-02-09 1982-11-30 Northern Telecom Limited Trunk interface circuit with current compensation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57104862U (en) * 1980-12-19 1982-06-28
US4361732A (en) * 1981-02-09 1982-11-30 Northern Telecom Limited Trunk interface circuit with current compensation

Also Published As

Publication number Publication date
JPS571959B2 (en) 1982-01-13

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