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JPS57116463A - Communication-circuit switching device - Google Patents

Communication-circuit switching device

Info

Publication number
JPS57116463A
JPS57116463A JP56001945A JP194581A JPS57116463A JP S57116463 A JPS57116463 A JP S57116463A JP 56001945 A JP56001945 A JP 56001945A JP 194581 A JP194581 A JP 194581A JP S57116463 A JPS57116463 A JP S57116463A
Authority
JP
Japan
Prior art keywords
communication
modem
processing part
signal
interface
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
JP56001945A
Other languages
Japanese (ja)
Inventor
Yoshihisa Ishida
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 JP56001945A priority Critical patent/JPS57116463A/en
Publication of JPS57116463A publication Critical patent/JPS57116463A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer And Data Communications (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)

Abstract

PURPOSE:To obtain a communication-circuit switching device which does not require a switching control line, etc., by receiving a control signal on a modem interface, and knowing a communication request and automatically forming a communication channel. CONSTITUTION:Communication processing parts 1-1 and 1-2 are used as an in- use and a stand-by system, and a modem 3 is in a communication state. The modem interface 5-3a of a modem 3 is changed from the interface 5-1a of the processing part 1-1 as the in-use system over to the interface 5-2a of the processing part 1-2 as the stand-by system. When a communication-circuit switching device 20 detects a communication request from the processing part 1-2 at the rise of a signal RS2, the interfaces 5-2a and 5-3a are connected mutually, and interfaces 5-1a and 5-3a are disconnected from each other. When a communication path for the stand-by system is connected, the communication request signal RS2 from the processing part 1-2 is supplied to the input of the modem 3, which is started by the signal RS to return a transmission ready signal CS3 to the processing part 1-2 through the device 20.
JP56001945A 1981-01-10 1981-01-10 Communication-circuit switching device Pending JPS57116463A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56001945A JPS57116463A (en) 1981-01-10 1981-01-10 Communication-circuit switching device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56001945A JPS57116463A (en) 1981-01-10 1981-01-10 Communication-circuit switching device

Publications (1)

Publication Number Publication Date
JPS57116463A true JPS57116463A (en) 1982-07-20

Family

ID=11515745

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56001945A Pending JPS57116463A (en) 1981-01-10 1981-01-10 Communication-circuit switching device

Country Status (1)

Country Link
JP (1) JPS57116463A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61193248A (en) * 1985-02-20 1986-08-27 Fujitsu Ltd Terminal device line connection switching method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61193248A (en) * 1985-02-20 1986-08-27 Fujitsu Ltd Terminal device line connection switching method
JPH0417537B2 (en) * 1985-02-20 1992-03-26 Fujitsu Ltd

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