JPS55135451A - Loop-type data transmission system - Google Patents

Loop-type data transmission system

Info

Publication number
JPS55135451A
JPS55135451A JP4280379A JP4280379A JPS55135451A JP S55135451 A JPS55135451 A JP S55135451A JP 4280379 A JP4280379 A JP 4280379A JP 4280379 A JP4280379 A JP 4280379A JP S55135451 A JPS55135451 A JP S55135451A
Authority
JP
Japan
Prior art keywords
data
transmitted
local
priority level
stations
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
JP4280379A
Other languages
Japanese (ja)
Inventor
Hitoshi Yamaguchi
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 JP4280379A priority Critical patent/JPS55135451A/en
Publication of JPS55135451A publication Critical patent/JPS55135451A/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

Landscapes

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

Abstract

PURPOSE:To have the preferable transmission if the data of a high priority level exists in the local station and even when the local station receives no polling, by transmitting the number showing the priority level decided previously according to the type of the data to be transmitted into the data. CONSTITUTION:Level Number PL showing the priority level of the data to be transmitted is inserted into the data format. The station received the data addressed to its own station receives the data at recaption circuit 2 in the same way as conventional, carries out the extraction at transmission information input circuit 3 for the priority level out of the data received, and then compares the PL of the received data and that of the data transmitted at priority decision circuit 4 only in case the data to be transmitted exists in the local station. And thus the local data is retained when the priority level of the local data is low. Then the data addressed to other stations are transmitted directly to lower-rank stations. While one frame of the data addressed to other stations is retained when the priority level of the local data is high. Thus the local data is transmitted in preference.
JP4280379A 1979-04-09 1979-04-09 Loop-type data transmission system Pending JPS55135451A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4280379A JPS55135451A (en) 1979-04-09 1979-04-09 Loop-type data transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4280379A JPS55135451A (en) 1979-04-09 1979-04-09 Loop-type data transmission system

Publications (1)

Publication Number Publication Date
JPS55135451A true JPS55135451A (en) 1980-10-22

Family

ID=12646114

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4280379A Pending JPS55135451A (en) 1979-04-09 1979-04-09 Loop-type data transmission system

Country Status (1)

Country Link
JP (1) JPS55135451A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60223251A (en) * 1984-04-18 1985-11-07 Fujitsu Ltd Insertion system of data selection register

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220704A (en) * 1975-08-11 1977-02-16 Nippon Syst Kogyo Kk Priority control data transmission system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220704A (en) * 1975-08-11 1977-02-16 Nippon Syst Kogyo Kk Priority control data transmission system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60223251A (en) * 1984-04-18 1985-11-07 Fujitsu Ltd Insertion system of data selection register

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