JPS56115057A - Data communication system - Google Patents

Data communication system

Info

Publication number
JPS56115057A
JPS56115057A JP1726280A JP1726280A JPS56115057A JP S56115057 A JPS56115057 A JP S56115057A JP 1726280 A JP1726280 A JP 1726280A JP 1726280 A JP1726280 A JP 1726280A JP S56115057 A JPS56115057 A JP S56115057A
Authority
JP
Japan
Prior art keywords
signal
data
polling
transmission
sends
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.)
Granted
Application number
JP1726280A
Other languages
Japanese (ja)
Other versions
JPS6239577B2 (en
Inventor
Masao Higuchi
Nobuyuki Ishida
Makoto Hirokami
Tokihide Hara
Ikuo Wakayama
Ryuichi Toki
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
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Original Assignee
Fujitsu Ltd
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
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 Fujitsu Ltd, Hitachi Ltd, NEC Corp, Nippon Telegraph and Telephone Corp, Oki Electric Industry Co Ltd, Nippon Electric Co Ltd filed Critical Fujitsu Ltd
Priority to JP1726280A priority Critical patent/JPS56115057A/en
Publication of JPS56115057A publication Critical patent/JPS56115057A/en
Publication of JPS6239577B2 publication Critical patent/JPS6239577B2/ja
Granted 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

Landscapes

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

Abstract

PURPOSE:To prevent an increment of traffic for the trunk circuit and at the same time secure a normal communication even when a transmission delay occurs, by using the polling signal and the closure signal between the main terminal and the subordinate terminal of the polling system. CONSTITUTION:In a communication cycle during which the send-back of data complets from the subordinate terminals TD1-TDn selected by the polling signal P and after a start of transmission of signal P through the main terminal TM, the repeating device RM transmits the P indication signal that indicates a transmission of signal P to TD to the repeating device RD when the first P signal is received from TM, and then sends the closure signal E back to TM. After this, the signal E is transmitted to TM when a coincidence is obtained between the subsequent P signal and the preceding P signal and in case the data is not received and accumulated from the selected TD, and the data is sent to TM during accumulation. On the other hand, RD transmits the signal P repetitively when receiving the signal S from TD and then sends the data, if receives, to RM.
JP1726280A 1980-02-15 1980-02-15 Data communication system Granted JPS56115057A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1726280A JPS56115057A (en) 1980-02-15 1980-02-15 Data communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1726280A JPS56115057A (en) 1980-02-15 1980-02-15 Data communication system

Publications (2)

Publication Number Publication Date
JPS56115057A true JPS56115057A (en) 1981-09-10
JPS6239577B2 JPS6239577B2 (en) 1987-08-24

Family

ID=11939046

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1726280A Granted JPS56115057A (en) 1980-02-15 1980-02-15 Data communication system

Country Status (1)

Country Link
JP (1) JPS56115057A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61244149A (en) * 1985-04-22 1986-10-30 Nec Corp Data transmission system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54142902A (en) * 1978-04-28 1979-11-07 Hitachi Ltd Communication system using polling emulator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54142902A (en) * 1978-04-28 1979-11-07 Hitachi Ltd Communication system using polling emulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61244149A (en) * 1985-04-22 1986-10-30 Nec Corp Data transmission system

Also Published As

Publication number Publication date
JPS6239577B2 (en) 1987-08-24

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