JPS57211851A - Multiplex transmission system - Google Patents

Multiplex transmission system

Info

Publication number
JPS57211851A
JPS57211851A JP56096545A JP9654581A JPS57211851A JP S57211851 A JPS57211851 A JP S57211851A JP 56096545 A JP56096545 A JP 56096545A JP 9654581 A JP9654581 A JP 9654581A JP S57211851 A JPS57211851 A JP S57211851A
Authority
JP
Japan
Prior art keywords
transmission system
converted
optical signal
branch device
multiplex 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.)
Pending
Application number
JP56096545A
Other languages
Japanese (ja)
Inventor
Kazuhiko Ishii
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56096545A priority Critical patent/JPS57211851A/en
Publication of JPS57211851A publication Critical patent/JPS57211851A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/20—Repeater circuits; Relay circuits
    • H04L25/26—Circuits with optical sensing means, i.e. using opto-couplers for isolation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Electronic Switches (AREA)
  • Networks Using Active Elements (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

PURPOSE:To obtain a multiplex transmission system which is not affected by external noises and prevented from the limitation of the pulse width of transmission signals by using a photocoupler element as a terminal branch device for a multidrop circuit. CONSTITUTION:A digital data signal transmitted from a central office which is not shown in the drawing through a common transmisson line is converted into an optical signal by a light emitting diode LED constituting a terminal branch device. Said optical signal is converted again into an electric signal by the 1st phototransistor and sent to a succeeding terminal branch device through a common transmission line and, simultaneously, a part of the optical signal is converted into an electric signal by the 2nd photodiode PT2 and sent to an unshown terminal device. Said constitution enables the multiplex transmission system to remove a ground loop without using a pulse transformer, so that external noises can be removed without the limitation of pulse width of transmission signals.
JP56096545A 1981-06-24 1981-06-24 Multiplex transmission system Pending JPS57211851A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56096545A JPS57211851A (en) 1981-06-24 1981-06-24 Multiplex transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56096545A JPS57211851A (en) 1981-06-24 1981-06-24 Multiplex transmission system

Publications (1)

Publication Number Publication Date
JPS57211851A true JPS57211851A (en) 1982-12-25

Family

ID=14168064

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56096545A Pending JPS57211851A (en) 1981-06-24 1981-06-24 Multiplex transmission system

Country Status (1)

Country Link
JP (1) JPS57211851A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6387930U (en) * 1986-06-26 1988-06-08

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6387930U (en) * 1986-06-26 1988-06-08

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