JPS57190442A - Branch line communication system - Google Patents

Branch line communication system

Info

Publication number
JPS57190442A
JPS57190442A JP7341681A JP7341681A JPS57190442A JP S57190442 A JPS57190442 A JP S57190442A JP 7341681 A JP7341681 A JP 7341681A JP 7341681 A JP7341681 A JP 7341681A JP S57190442 A JPS57190442 A JP S57190442A
Authority
JP
Japan
Prior art keywords
center
communication
terminal device
line
interrupt
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
JP7341681A
Other languages
Japanese (ja)
Inventor
Masaaki Ohara
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 JP7341681A priority Critical patent/JPS57190442A/en
Publication of JPS57190442A publication Critical patent/JPS57190442A/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]
    • H04L12/40—Bus networks
    • H04L12/40143—Bus networks involving priority mechanisms
    • 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]
    • H04L12/40—Bus networks
    • H04L12/403—Bus networks with centralised control, e.g. polling

Landscapes

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

Abstract

PURPOSE:To interrupt communication with high priority by connecting a switch enabling the line to be interrupted only in calling to a terminal device. CONSTITUTION:Many terminal devices like the one shown in the drawing and a center device are connected to a line Li. In the shown terminal device, a polling signal from the center device is received by a control part 2 through a signal receiving part 1 and the status of the self terminal device is sent to the center device through a transmission part 5 and a switching part 6. When the communication with the center is permitted, the communication with the center is performed by a device such as a telephone 3 through a communication controlling deice 7. No polling signal from the center device informs the control part 2 that the line Li is being used by another terminal device. If a communication request with high priority is generated in the self terminal device in said status and an interrupt switch 9 is depressed, an interrupt signal is sent to the center device through a switching circuit controlling part 8 and the line Li.
JP7341681A 1981-05-18 1981-05-18 Branch line communication system Pending JPS57190442A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7341681A JPS57190442A (en) 1981-05-18 1981-05-18 Branch line communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7341681A JPS57190442A (en) 1981-05-18 1981-05-18 Branch line communication system

Publications (1)

Publication Number Publication Date
JPS57190442A true JPS57190442A (en) 1982-11-24

Family

ID=13517575

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7341681A Pending JPS57190442A (en) 1981-05-18 1981-05-18 Branch line communication system

Country Status (1)

Country Link
JP (1) JPS57190442A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59231947A (en) * 1983-06-15 1984-12-26 Matsushita Electric Works Ltd Time division multiplex transmission system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59231947A (en) * 1983-06-15 1984-12-26 Matsushita Electric Works Ltd Time division multiplex transmission system
JPH038617B2 (en) * 1983-06-15 1991-02-06 Matsushita Electric Works Ltd

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