JPS55124356A - Data transmission system - Google Patents

Data transmission system

Info

Publication number
JPS55124356A
JPS55124356A JP3195279A JP3195279A JPS55124356A JP S55124356 A JPS55124356 A JP S55124356A JP 3195279 A JP3195279 A JP 3195279A JP 3195279 A JP3195279 A JP 3195279A JP S55124356 A JPS55124356 A JP S55124356A
Authority
JP
Japan
Prior art keywords
circuit
unit
terminal
code
start signal
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
JP3195279A
Other languages
Japanese (ja)
Other versions
JPS6242550B2 (en
Inventor
Yoshimi Sato
Kazuhiko Shirai
Masanori Nakazawa
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
Nippon Telegraph and Telephone Corp
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 JP3195279A priority Critical patent/JPS55124356A/en
Publication of JPS55124356A publication Critical patent/JPS55124356A/en
Publication of JPS6242550B2 publication Critical patent/JPS6242550B2/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

Abstract

PURPOSE:To prevent occurrence of the short ring of the telephone bell by increasing and decreasing gradually the current to the next code transmitter after the network control unit is actuated with the start signal sent from the central unit. CONSTITUTION:Terminal 51 of no-ringing network control unit 5 is connected to the telephone network, and terminal 58 is connected to the code transmitter each. With supply of the working power from terminal 51, all circuits 52-57 within unit 5 become active. And the start signal sent from the central unit is received at reception circuit 54, and then the necessary process is carried out through reception decision circuit 56. After this, switch circuit 57 is controlled to give switching to both terminal 58 and no-ringing connection circuit 55. Circuit 55 gives the slow connection between the rise and the fall of the power consumption level of the code unit. In such way, the occurrence can be prevented for the short ring phenomenon of the bell circuit caused by the sudden current change when the code unit is connected.
JP3195279A 1979-03-19 1979-03-19 Data transmission system Granted JPS55124356A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3195279A JPS55124356A (en) 1979-03-19 1979-03-19 Data transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3195279A JPS55124356A (en) 1979-03-19 1979-03-19 Data transmission system

Publications (2)

Publication Number Publication Date
JPS55124356A true JPS55124356A (en) 1980-09-25
JPS6242550B2 JPS6242550B2 (en) 1987-09-09

Family

ID=12345287

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3195279A Granted JPS55124356A (en) 1979-03-19 1979-03-19 Data transmission system

Country Status (1)

Country Link
JP (1) JPS55124356A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5732168A (en) * 1980-08-05 1982-02-20 Nec Corp No-ringing network controller
JPS58114661A (en) * 1981-12-23 1983-07-08 シ−メンス・アクチエンゲゼルシヤフト Alphanumeric character transmitting method
JPH0364158A (en) * 1989-07-31 1991-03-19 Sharp Corp Network controller for terminal equipment
JPH03236664A (en) * 1990-02-13 1991-10-22 Sharp Corp Network control unit for terminal equipment
JPH03293853A (en) * 1990-04-11 1991-12-25 Sharp Corp Terminal network controller

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5732168A (en) * 1980-08-05 1982-02-20 Nec Corp No-ringing network controller
JPS6216594B2 (en) * 1980-08-05 1987-04-13 Nippon Denki Kk
JPS58114661A (en) * 1981-12-23 1983-07-08 シ−メンス・アクチエンゲゼルシヤフト Alphanumeric character transmitting method
JPH0364158A (en) * 1989-07-31 1991-03-19 Sharp Corp Network controller for terminal equipment
JPH03236664A (en) * 1990-02-13 1991-10-22 Sharp Corp Network control unit for terminal equipment
JP2594663B2 (en) * 1990-02-13 1997-03-26 シャープ株式会社 Terminal network controller
JPH03293853A (en) * 1990-04-11 1991-12-25 Sharp Corp Terminal network controller

Also Published As

Publication number Publication date
JPS6242550B2 (en) 1987-09-09

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