JPS55124355A - Terminal reply system for data transmission - Google Patents

Terminal reply system for data transmission

Info

Publication number
JPS55124355A
JPS55124355A JP3195179A JP3195179A JPS55124355A JP S55124355 A JPS55124355 A JP S55124355A JP 3195179 A JP3195179 A JP 3195179A JP 3195179 A JP3195179 A JP 3195179A JP S55124355 A JPS55124355 A JP S55124355A
Authority
JP
Japan
Prior art keywords
circuit
line
data transmission
telephone
office
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
JP3195179A
Other languages
Japanese (ja)
Other versions
JPS6318378B2 (en
Inventor
Yoshimi Sato
Kazuhiko Shirai
Hiroshi Sekiguchi
Kyoichi Nakakawara
Fukue Ogawa
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.)
Toshiba Corp
NEC Corp
NTT Inc
Original Assignee
Toshiba Corp
NEC Corp
Nippon Telegraph and Telephone Corp
Tokyo Shibaura Electric 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 Toshiba Corp, NEC Corp, Nippon Telegraph and Telephone Corp, Tokyo Shibaura Electric Co Ltd, Nippon Electric Co Ltd filed Critical Toshiba Corp
Priority to JP3195179A priority Critical patent/JPS55124355A/en
Publication of JPS55124355A publication Critical patent/JPS55124355A/en
Publication of JPS6318378B2 publication Critical patent/JPS6318378B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/066—Telephone sets adapted for data transmision

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

PURPOSE:To cause no inconvenience at all to the communication work in case the DC of the slave office power source is fed from the side of the master office, by providing both the start signal reception circuit and the AC replay signal transmission circuit to the slave office unit. CONSTITUTION:The anode of diode 07 is connected to line A of the telephone line, and the data transmission is possible only when line A features the higher potential than wire B. While in case line B features the higher potential than wire A, the transmission is cut by diode 07. Thus the power consumption becomes 0 at the queuing time. With operation of start signal reception circuit 08, AC reply signal transmission 09 is connected to circuit 04 via relay contact 11 to receive the power from circuit 04. When the data transmission completes, the polarity of circuit 04 is inverted to discontinue the power supply. At the same time, the off- hook of telephone 05 is detected by off-hook detection circuit 10, and then the reply signal from slave office unit 06 is stopped. At the master office side, the off-hook of telephone 05 is detected by the break of the reply signal.
JP3195179A 1979-03-19 1979-03-19 Terminal reply system for data transmission Granted JPS55124355A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3195179A JPS55124355A (en) 1979-03-19 1979-03-19 Terminal reply system for data transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3195179A JPS55124355A (en) 1979-03-19 1979-03-19 Terminal reply system for data transmission

Publications (2)

Publication Number Publication Date
JPS55124355A true JPS55124355A (en) 1980-09-25
JPS6318378B2 JPS6318378B2 (en) 1988-04-18

Family

ID=12345261

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3195179A Granted JPS55124355A (en) 1979-03-19 1979-03-19 Terminal reply system for data transmission

Country Status (1)

Country Link
JP (1) JPS55124355A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03236664A (en) * 1990-02-13 1991-10-22 Sharp Corp Network control unit for terminal equipment

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5034253A (en) * 1973-07-26 1975-04-02
JPS50159204A (en) * 1974-06-11 1975-12-23

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5034253A (en) * 1973-07-26 1975-04-02
JPS50159204A (en) * 1974-06-11 1975-12-23

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03236664A (en) * 1990-02-13 1991-10-22 Sharp Corp Network control unit for terminal equipment

Also Published As

Publication number Publication date
JPS6318378B2 (en) 1988-04-18

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