JPS5449003A - Supervisory system for system margin - Google Patents

Supervisory system for system margin

Info

Publication number
JPS5449003A
JPS5449003A JP11587877A JP11587877A JPS5449003A JP S5449003 A JPS5449003 A JP S5449003A JP 11587877 A JP11587877 A JP 11587877A JP 11587877 A JP11587877 A JP 11587877A JP S5449003 A JPS5449003 A JP S5449003A
Authority
JP
Japan
Prior art keywords
circuit
regenerating
signal
supervisory
output
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
JP11587877A
Other languages
Japanese (ja)
Inventor
Satoshi Ikeuchi
Masanori Honda
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 JP11587877A priority Critical patent/JPS5449003A/en
Publication of JPS5449003A publication Critical patent/JPS5449003A/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
    • H04L1/24—Testing correct operation
    • H04L1/241—Testing correct operation using pseudo-errors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)

Abstract

PURPOSE:To improve the reliability of a data transmission system by excising inspections of the S/N deterioration and characteristic deterioration of each part through the measurement of a system margin during data transmission by using a simple constitution. CONSTITUTION:On the system margin supervisory system of a light communication system, a photo signal transmitted via light transmission line 1 is supplied to photo detector 2 such as an avalanche diode, whose output is amplified by amplifier 3, and the output of amplifier 3 is applied to automatic threshold setting circuit 4, and the 1st and 2nd discriminative regenerating circuits 5 and 6. Then, thershold level Vth1 equivalent to a reception level is applied from threshold setting circuit 4 to regenerating circuit 5, where a received signal is discriminated with threshold level Vth1. Regenerating circuit 6, on the other hand, discriminates the received signal with threshold level Vth2, from terminal 11 and the discrimination signal is applied to exclusive OR circuit 8 via delay circuit 7 to be compared with the discrimination signal of regenerating circuit 5, so that if they disagree each other, a supervisory output signal will be sent.
JP11587877A 1977-09-27 1977-09-27 Supervisory system for system margin Pending JPS5449003A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11587877A JPS5449003A (en) 1977-09-27 1977-09-27 Supervisory system for system margin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11587877A JPS5449003A (en) 1977-09-27 1977-09-27 Supervisory system for system margin

Publications (1)

Publication Number Publication Date
JPS5449003A true JPS5449003A (en) 1979-04-18

Family

ID=14673395

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11587877A Pending JPS5449003A (en) 1977-09-27 1977-09-27 Supervisory system for system margin

Country Status (1)

Country Link
JP (1) JPS5449003A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5693051U (en) * 1979-12-17 1981-07-24
JPH01264005A (en) * 1988-04-14 1989-10-20 Toshiba Corp Sensor amplifier circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5693051U (en) * 1979-12-17 1981-07-24
JPH01264005A (en) * 1988-04-14 1989-10-20 Toshiba Corp Sensor amplifier circuit

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