JPS56158551A - Data transmission controlling system - Google Patents

Data transmission controlling system

Info

Publication number
JPS56158551A
JPS56158551A JP6293980A JP6293980A JPS56158551A JP S56158551 A JPS56158551 A JP S56158551A JP 6293980 A JP6293980 A JP 6293980A JP 6293980 A JP6293980 A JP 6293980A JP S56158551 A JPS56158551 A JP S56158551A
Authority
JP
Japan
Prior art keywords
signal
line
transmission line
positive transmission
data 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
JP6293980A
Other languages
Japanese (ja)
Inventor
Masahiro Tada
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP6293980A priority Critical patent/JPS56158551A/en
Publication of JPS56158551A publication Critical patent/JPS56158551A/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
    • H04L1/242—Testing correct operation by comparing a transmitted test signal with a locally generated replica
    • H04L1/243—Testing correct operation by comparing a transmitted test signal with a locally generated replica at the transmitter, using a loop-back

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To make automation for folded connection with a small-sized constitution, by connecting the subtransmission line to the input side of the positive transmission line automatically, if the input signal sent from the positive transmission line is interrupted, in a signal folding connection of a loop-shape data transmission system. CONSTITUTION:When a positive transmission line 10-P1 is normal, since logic 1s are not transmitted 15 or more consecutively, no signal is outputted from a carrier terminal CRY of a counter 22. If the positive transmission line 10-P1 is interrupted and no clear signal is inputted, a signal is outputted to the carrier terminal CRY of the counter 22, the contacts of a switching circuit 28 is changed from (a) to (b) and from (d) to (c), and a subtransmission line 10-S1 and a signal line 50 are connected with a signal line 70 for folding connection.
JP6293980A 1980-05-13 1980-05-13 Data transmission controlling system Pending JPS56158551A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6293980A JPS56158551A (en) 1980-05-13 1980-05-13 Data transmission controlling system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6293980A JPS56158551A (en) 1980-05-13 1980-05-13 Data transmission controlling system

Publications (1)

Publication Number Publication Date
JPS56158551A true JPS56158551A (en) 1981-12-07

Family

ID=13214767

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6293980A Pending JPS56158551A (en) 1980-05-13 1980-05-13 Data transmission controlling system

Country Status (1)

Country Link
JP (1) JPS56158551A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4519070A (en) * 1984-01-19 1985-05-21 Burroughs Corporation Method of initializing and recovering from failures in a local area network

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56149851A (en) * 1980-04-23 1981-11-19 Mitsubishi Electric Corp Looplike data transmission equipment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56149851A (en) * 1980-04-23 1981-11-19 Mitsubishi Electric Corp Looplike data transmission equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4519070A (en) * 1984-01-19 1985-05-21 Burroughs Corporation Method of initializing and recovering from failures in a local area network

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