JPS57111147A - Station to be supervised, having folding function in optical loop transmission network - Google Patents

Station to be supervised, having folding function in optical loop transmission network

Info

Publication number
JPS57111147A
JPS57111147A JP18693880A JP18693880A JPS57111147A JP S57111147 A JPS57111147 A JP S57111147A JP 18693880 A JP18693880 A JP 18693880A JP 18693880 A JP18693880 A JP 18693880A JP S57111147 A JPS57111147 A JP S57111147A
Authority
JP
Japan
Prior art keywords
wavelength
signal
optical
optical signal
transmission line
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
JP18693880A
Other languages
Japanese (ja)
Inventor
Kazuo Iguchi
Naomasa Hanano
Tsutomu Fukugahara
Masaaki Takahashi
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.)
Fujitsu Ltd
Original Assignee
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP18693880A priority Critical patent/JPS57111147A/en
Publication of JPS57111147A publication Critical patent/JPS57111147A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Small-Scale Networks (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To maintain communication even when an optical transmission line itself has been disconnected, by making each wave supervisory station have a folding function, by folding by an optical signal of the other wavelength when an optical signal of one wavelength between 2 kinds of wavelength has been cut off. CONSTITUTION:When an optical signal of wavelength lambda1 has been stopped, a control signal is outputted from an input signal cut-off detecting circuit 18', and a switch 20 is switched to the side of B' from A'. Accordingly, an optical signal of wavelength lambda2 from an optical transmission line 3' is converted to an electric signal, and after that, the prescribed processing is executed by a data inserting an branching circuit 17 it is converted to an optical signal of wavelength lambda1 by an electric signal/electric signal converting circuit 9 through the switch 20, and is folded to the transmission line 3' again. On the other hand, in case the optical signal of wavelength lambda2 has been stopped, a switch 19 is switched to the side of B from A by a control signal 23, and the same operation as above is executed. In this way, communication can be maintained even if the optical transmission line has been disconnected, and reliability of the transmission system is raised.
JP18693880A 1980-12-26 1980-12-26 Station to be supervised, having folding function in optical loop transmission network Pending JPS57111147A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18693880A JPS57111147A (en) 1980-12-26 1980-12-26 Station to be supervised, having folding function in optical loop transmission network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18693880A JPS57111147A (en) 1980-12-26 1980-12-26 Station to be supervised, having folding function in optical loop transmission network

Publications (1)

Publication Number Publication Date
JPS57111147A true JPS57111147A (en) 1982-07-10

Family

ID=16197342

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18693880A Pending JPS57111147A (en) 1980-12-26 1980-12-26 Station to be supervised, having folding function in optical loop transmission network

Country Status (1)

Country Link
JP (1) JPS57111147A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5991745A (en) * 1982-11-18 1984-05-26 Yamatake Honeywell Co Ltd Coupler for optical communication
JPS60117832A (en) * 1983-11-29 1985-06-25 Toshiba Corp Transmission/reception interface for two-way optical transmission
JPS63187932A (en) * 1987-01-30 1988-08-03 Meidensha Electric Mfg Co Ltd Optical loop transmission system
JPH0846570A (en) * 1994-08-01 1996-02-16 Nec Corp Optical terminal and optical network

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56103549A (en) * 1980-01-22 1981-08-18 Toshiba Corp Loop type optical communication system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56103549A (en) * 1980-01-22 1981-08-18 Toshiba Corp Loop type optical communication system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5991745A (en) * 1982-11-18 1984-05-26 Yamatake Honeywell Co Ltd Coupler for optical communication
JPS60117832A (en) * 1983-11-29 1985-06-25 Toshiba Corp Transmission/reception interface for two-way optical transmission
JPS63187932A (en) * 1987-01-30 1988-08-03 Meidensha Electric Mfg Co Ltd Optical loop transmission system
JPH0846570A (en) * 1994-08-01 1996-02-16 Nec Corp Optical terminal and optical network

Similar Documents

Publication Publication Date Title
JPS57157661A (en) Transmission line switching system
JPS57111147A (en) Station to be supervised, having folding function in optical loop transmission network
US3946315A (en) Single frequency signalling in a radiotelephone communication system with idle condition signal generator at one terminal activated by another terminal
ES8608189A1 (en) Testable optically isolated control circuit
JPS57186855A (en) Optical communication system
JPS57173245A (en) Data transmission system
JPS57176850A (en) Transmitting system
JPS56112166A (en) Receiving voice amplifying system for telephone set
JPS57173236A (en) Composite loop transmitter
KR900015482A (en) I / O switching circuit
JPS56138346A (en) Control system for multipoint line
JPS57106289A (en) Abnormality corresponding method on catv system
WO1988001085A3 (en) Fiber optics communication link for remote mobile vehicle
JPS5732150A (en) Optical communication switching transmission system
JPS5678267A (en) Light exchange system
JPS56158551A (en) Data transmission controlling system
JPS5550757A (en) Signal change-over control device
JPS57186704A (en) Optical switch
Tong et al. 32-Channel hybridly-integrated tunable receiver
JPS56119557A (en) Communication mode switching system
JPS55154844A (en) Light-source redundancy system of light repeater
JPS57132455A (en) Communication controlling system
JPS5827704B2 (en) Data transmission system using optical transmission line
JPS56149831A (en) Duplex line switching unit
JPS55125741A (en) Optical fiber transmission system