JPS55156435A - Fault bracketing system of two-way light transmitter - Google Patents

Fault bracketing system of two-way light transmitter

Info

Publication number
JPS55156435A
JPS55156435A JP6320079A JP6320079A JPS55156435A JP S55156435 A JPS55156435 A JP S55156435A JP 6320079 A JP6320079 A JP 6320079A JP 6320079 A JP6320079 A JP 6320079A JP S55156435 A JPS55156435 A JP S55156435A
Authority
JP
Japan
Prior art keywords
fault
electric
occurred
faults
signals
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
JP6320079A
Other languages
Japanese (ja)
Inventor
Masayuki Goto
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 JP6320079A priority Critical patent/JPS55156435A/en
Publication of JPS55156435A publication Critical patent/JPS55156435A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/14—Arrangements for detecting or preventing errors in the information received by using return channel in which the signals are sent back to the transmitter to be checked ; echo systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To shorten the recovery time of a system after fault occurrence as well as the time of detecting a fault spot, by employing the conception that faults are bracketed into electric-system faults and photo-system faults. CONSTITUTION:In light transmitters 2' and 3', switching methods 25 and 35 are provided which send back electric signals from one transmission line to the other one. If a fault occurs, the switching methods are sequentially operated and transmitted signals are compared with sent-back signals to judge whether an electric- system fault has occurred. As a result, when it has occurred, electric system equipments 21 and 24 or 31 and 34 are checked and when the electric-system fault is found not to have occurred, photo-system equipments 22, 23, 32, 33, 5, and 6 are inspected.
JP6320079A 1979-05-24 1979-05-24 Fault bracketing system of two-way light transmitter Pending JPS55156435A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6320079A JPS55156435A (en) 1979-05-24 1979-05-24 Fault bracketing system of two-way light transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6320079A JPS55156435A (en) 1979-05-24 1979-05-24 Fault bracketing system of two-way light transmitter

Publications (1)

Publication Number Publication Date
JPS55156435A true JPS55156435A (en) 1980-12-05

Family

ID=13222327

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6320079A Pending JPS55156435A (en) 1979-05-24 1979-05-24 Fault bracketing system of two-way light transmitter

Country Status (1)

Country Link
JP (1) JPS55156435A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5199904A (en) * 1975-02-28 1976-09-03 Fujitsu Ltd

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5199904A (en) * 1975-02-28 1976-09-03 Fujitsu Ltd

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