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JPS5413715A - Four-wire switching system - Google Patents

Four-wire switching system

Info

Publication number
JPS5413715A
JPS5413715A JP7884577A JP7884577A JPS5413715A JP S5413715 A JPS5413715 A JP S5413715A JP 7884577 A JP7884577 A JP 7884577A JP 7884577 A JP7884577 A JP 7884577A JP S5413715 A JPS5413715 A JP S5413715A
Authority
JP
Japan
Prior art keywords
switching system
wire switching
switch frame
wire switch
wire
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
JP7884577A
Other languages
Japanese (ja)
Inventor
Masao Ogiwara
Yoshitaka Osakabe
Ayafumi Komatsu
Kiyokazu Ishikawa
Toshio Hidaka
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.)
Fujitsu Ltd
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Original Assignee
Fujitsu Ltd
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Nippon 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 Fujitsu Ltd, Hitachi Ltd, NEC Corp, Nippon Telegraph and Telephone Corp, Oki Electric Industry Co Ltd, Nippon Electric Co Ltd filed Critical Fujitsu Ltd
Priority to JP7884577A priority Critical patent/JPS5413715A/en
Publication of JPS5413715A publication Critical patent/JPS5413715A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Exchange Systems With Centralized Control (AREA)

Abstract

PURPOSE:To economize a four-wire switch frame by composing a hybrid transformer of single-input amplifiers and differential amplifiers, by making the switching by a two-wire switch frame.
JP7884577A 1977-07-01 1977-07-01 Four-wire switching system Pending JPS5413715A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7884577A JPS5413715A (en) 1977-07-01 1977-07-01 Four-wire switching system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7884577A JPS5413715A (en) 1977-07-01 1977-07-01 Four-wire switching system

Publications (1)

Publication Number Publication Date
JPS5413715A true JPS5413715A (en) 1979-02-01

Family

ID=13673153

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7884577A Pending JPS5413715A (en) 1977-07-01 1977-07-01 Four-wire switching system

Country Status (1)

Country Link
JP (1) JPS5413715A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0722377U (en) * 1993-09-30 1995-04-21 佐太巳 服部 Portable cooler

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700831A (en) * 1970-01-13 1972-10-24 Philips Corp Hybrid circuit
US3849609A (en) * 1972-06-15 1974-11-19 Philips Corp Hybrid circuit
JPS5186904A (en) * 1974-12-23 1976-07-30 Ibm KANYUSHAKAISENINTAAFUEISUKAIRO

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700831A (en) * 1970-01-13 1972-10-24 Philips Corp Hybrid circuit
US3849609A (en) * 1972-06-15 1974-11-19 Philips Corp Hybrid circuit
JPS5186904A (en) * 1974-12-23 1976-07-30 Ibm KANYUSHAKAISENINTAAFUEISUKAIRO

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0722377U (en) * 1993-09-30 1995-04-21 佐太巳 服部 Portable cooler

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