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JPS522309A - Operator's communication system - Google Patents

Operator's communication system

Info

Publication number
JPS522309A
JPS522309A JP50078720A JP7872075A JPS522309A JP S522309 A JPS522309 A JP S522309A JP 50078720 A JP50078720 A JP 50078720A JP 7872075 A JP7872075 A JP 7872075A JP S522309 A JPS522309 A JP S522309A
Authority
JP
Japan
Prior art keywords
operator
communication system
composing
amplifiers
system capable
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
JP50078720A
Other languages
Japanese (ja)
Other versions
JPS579545B2 (en
Inventor
Shoichi Abe
Yoshito Kaneda
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.)
NEC Corp
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone Corp
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 NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP50078720A priority Critical patent/JPS522309A/en
Publication of JPS522309A publication Critical patent/JPS522309A/en
Publication of JPS579545B2 publication Critical patent/JPS579545B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To provide a system capable of making fixed characteristic impedance by composing an operator intervening circuit by use of amplifiers and hybrid circuits in a four-line telephone exchange network.
JP50078720A 1975-06-24 1975-06-24 Operator's communication system Granted JPS522309A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP50078720A JPS522309A (en) 1975-06-24 1975-06-24 Operator's communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50078720A JPS522309A (en) 1975-06-24 1975-06-24 Operator's communication system

Publications (2)

Publication Number Publication Date
JPS522309A true JPS522309A (en) 1977-01-10
JPS579545B2 JPS579545B2 (en) 1982-02-22

Family

ID=13669703

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50078720A Granted JPS522309A (en) 1975-06-24 1975-06-24 Operator's communication system

Country Status (1)

Country Link
JP (1) JPS522309A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59118550U (en) * 1983-01-28 1984-08-10 ゼネラル株式会社 Multicolor thermal transfer media
JPS6088762U (en) * 1983-11-25 1985-06-18 株式会社東芝 Thermal ink ribbon for thermal transfer color printers

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5012246A (en) * 1973-06-01 1975-02-07

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5012246A (en) * 1973-06-01 1975-02-07

Also Published As

Publication number Publication date
JPS579545B2 (en) 1982-02-22

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