JPS57170651A - Automatic changeover system for data transmission circuit - Google Patents

Automatic changeover system for data transmission circuit

Info

Publication number
JPS57170651A
JPS57170651A JP56055262A JP5526281A JPS57170651A JP S57170651 A JPS57170651 A JP S57170651A JP 56055262 A JP56055262 A JP 56055262A JP 5526281 A JP5526281 A JP 5526281A JP S57170651 A JPS57170651 A JP S57170651A
Authority
JP
Japan
Prior art keywords
service processing
processing device
circuit
data transmission
automatic changeover
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
JP56055262A
Other languages
Japanese (ja)
Inventor
Tamotsu Asahina
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP56055262A priority Critical patent/JPS57170651A/en
Publication of JPS57170651A publication Critical patent/JPS57170651A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/40—Bus structure
    • G06F13/4004—Coupling between buses
    • G06F13/4022—Coupling between buses using switching circuits, e.g. switching matrix, connection or expansion network

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)
  • Computer And Data Communications (AREA)

Abstract

PURPOSE:To use a data transmission circuit in common and to prevent erroneous operation by controlling a changeover device that switches a data transmission circuit betweena service processing device and a communication control device in terminal side. CONSTITUTION:An automatic changeover device 5 switches a circuit signal obtained through a modulator and demodulator 2 and a cable 3 to a service processing device 6 side or to a communication control device 7 side by a control signal from a service processing device 6. The service processing device 6 checks connection request from the circuit at a dertain period. When connection request is received, the device performs connecting process and sends out a message to a terminal device 1 asking destination. When the code of destination is inputted from the terminal device 1, the service processing device 6 decodes the code and if the destination is the communication control unit 7, sends a changeover controlling signal to the automatic changeover device 5. In the case where the circuit is broken, the service processing device 6 sends out a control command signal to the automatic changeover device 5, and makes connection of the circuit signal to the service processing device 6 side.
JP56055262A 1981-04-13 1981-04-13 Automatic changeover system for data transmission circuit Pending JPS57170651A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56055262A JPS57170651A (en) 1981-04-13 1981-04-13 Automatic changeover system for data transmission circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56055262A JPS57170651A (en) 1981-04-13 1981-04-13 Automatic changeover system for data transmission circuit

Publications (1)

Publication Number Publication Date
JPS57170651A true JPS57170651A (en) 1982-10-20

Family

ID=12993678

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56055262A Pending JPS57170651A (en) 1981-04-13 1981-04-13 Automatic changeover system for data transmission circuit

Country Status (1)

Country Link
JP (1) JPS57170651A (en)

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