JPS56112161A - Signal transmitting device - Google Patents

Signal transmitting device

Info

Publication number
JPS56112161A
JPS56112161A JP1531580A JP1531580A JPS56112161A JP S56112161 A JPS56112161 A JP S56112161A JP 1531580 A JP1531580 A JP 1531580A JP 1531580 A JP1531580 A JP 1531580A JP S56112161 A JPS56112161 A JP S56112161A
Authority
JP
Japan
Prior art keywords
self
circuit
diagnosis
transmitter
buffer
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
JP1531580A
Other languages
Japanese (ja)
Inventor
Sadao Mizokawa
Hitoshi Fushimi
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 JP1531580A priority Critical patent/JPS56112161A/en
Publication of JPS56112161A publication Critical patent/JPS56112161A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • H04L12/437—Ring fault isolation or reconfiguration

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)
  • Bidirectional Digital Transmission (AREA)

Abstract

PURPOSE:To enable effective self-diagnosis of a device by diagnosing its operation comparing with a receiving signal of the same expression type while delaying the transmission signal prescribed beforehand. CONSTITUTION:Predetermined data transmitted from a computer 21 pass through an attenuator 56 via a buffer 4, a transmitting circuit 6, a transmitter 8 and an LED10, and transmitted and received through a self-loop that passes through a photoelectric element 5 and a buffer 3. The input of the transmitter 8 is delayed by a certain time through a delay circuit 11, and the action is diagnosed by comparing with a receiving signal of the same expression type of the receiver 7, in a collating circuit 12. The result is reported to a control circuit 15 by a common signal 21b. By this way, self-diagnosis of the device is made effectively.
JP1531580A 1980-02-08 1980-02-08 Signal transmitting device Pending JPS56112161A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1531580A JPS56112161A (en) 1980-02-08 1980-02-08 Signal transmitting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1531580A JPS56112161A (en) 1980-02-08 1980-02-08 Signal transmitting device

Publications (1)

Publication Number Publication Date
JPS56112161A true JPS56112161A (en) 1981-09-04

Family

ID=11885342

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1531580A Pending JPS56112161A (en) 1980-02-08 1980-02-08 Signal transmitting device

Country Status (1)

Country Link
JP (1) JPS56112161A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6172445A (en) * 1984-09-04 1986-04-14 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Defect detecting method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6172445A (en) * 1984-09-04 1986-04-14 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Defect detecting method
JPH0376620B2 (en) * 1984-09-14 1991-12-06 Intaanashonaru Bijinesu Mashiinzu Corp

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