JPS57181251A - Data transmission system - Google Patents

Data transmission system

Info

Publication number
JPS57181251A
JPS57181251A JP56066322A JP6632281A JPS57181251A JP S57181251 A JPS57181251 A JP S57181251A JP 56066322 A JP56066322 A JP 56066322A JP 6632281 A JP6632281 A JP 6632281A JP S57181251 A JPS57181251 A JP S57181251A
Authority
JP
Japan
Prior art keywords
circuit
signal receiving
receiving circuit
power source
data transmission
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
JP56066322A
Other languages
Japanese (ja)
Other versions
JPS6247019B2 (en
Inventor
Katsuo Suzuki
Junichi Koike
Hisamasa Arai
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.)
HASEGAWA DENKI SEISAKUSHO
HASEGAWA DENKI SEISAKUSHO KK
Fujitsu Ltd
Original Assignee
HASEGAWA DENKI SEISAKUSHO
HASEGAWA DENKI SEISAKUSHO KK
Fujitsu 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 HASEGAWA DENKI SEISAKUSHO, HASEGAWA DENKI SEISAKUSHO KK, Fujitsu Ltd filed Critical HASEGAWA DENKI SEISAKUSHO
Priority to JP56066322A priority Critical patent/JPS57181251A/en
Publication of JPS57181251A publication Critical patent/JPS57181251A/en
Publication of JPS6247019B2 publication Critical patent/JPS6247019B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Dc Digital Transmission (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Bidirectional Digital Transmission (AREA)

Abstract

PURPOSE:To attain economization by securing data transmission and reception even if a main and a terminal equipment side has a shift in clock phase, and then removing two transformers which are necessary in phantom feeding without reference to a phantom feeding system. CONSTITUTION:In a main equipmentI, transistors TrQ1 and TrQ2 are connected in series, the TrQ1 is connected to a power source while the TrQ2 is grounded, and a connection point between the Trs Q1 and Q2 is connected to the power source through a high resistance; and a TR circuit which changes in state at the connection point (m) corresponding to the on-off states of the Trs Q1 and Q2, a signal receiving circuit for detecting a signal voltage, and a terminal connected to the connection point (m) and the input point of the signal receiving circuit are provided. A terminal equipment II, on the other hand, has a signal receiving circuit for detecting a signal voltage, a TrQ3 turned on and off corresponding to data to be sent out, a stabilized power source circuit PS for supplying a stabilized voltage, and a terminal connecting with the input point of the signal receiving circuit, the output point of the TrQ3, and the input point of the circuit PS. Further, the main equipmentIand terminal equipment II are connected mutually by a data transmission line DL.
JP56066322A 1981-04-30 1981-04-30 Data transmission system Granted JPS57181251A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56066322A JPS57181251A (en) 1981-04-30 1981-04-30 Data transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56066322A JPS57181251A (en) 1981-04-30 1981-04-30 Data transmission system

Publications (2)

Publication Number Publication Date
JPS57181251A true JPS57181251A (en) 1982-11-08
JPS6247019B2 JPS6247019B2 (en) 1987-10-06

Family

ID=13312477

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56066322A Granted JPS57181251A (en) 1981-04-30 1981-04-30 Data transmission system

Country Status (1)

Country Link
JP (1) JPS57181251A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5051980A (en) * 1988-08-11 1991-09-24 El Paso Natural Gas Company Data communication interface device
US5311518A (en) * 1990-04-16 1994-05-10 Fujitsu Limited ISDN interface circuit and system using the same
JP2011203112A (en) * 2010-03-25 2011-10-13 Toshiba Corp Current detection circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5051980A (en) * 1988-08-11 1991-09-24 El Paso Natural Gas Company Data communication interface device
US5311518A (en) * 1990-04-16 1994-05-10 Fujitsu Limited ISDN interface circuit and system using the same
JP2011203112A (en) * 2010-03-25 2011-10-13 Toshiba Corp Current detection circuit

Also Published As

Publication number Publication date
JPS6247019B2 (en) 1987-10-06

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