JPS5742248A - Switching device for communication system - Google Patents

Switching device for communication system

Info

Publication number
JPS5742248A
JPS5742248A JP55118167A JP11816780A JPS5742248A JP S5742248 A JPS5742248 A JP S5742248A JP 55118167 A JP55118167 A JP 55118167A JP 11816780 A JP11816780 A JP 11816780A JP S5742248 A JPS5742248 A JP S5742248A
Authority
JP
Japan
Prior art keywords
communication system
modem12b1
data terminal
carrier detection
modem12b2
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
JP55118167A
Other languages
Japanese (ja)
Inventor
Masataka Tomikawa
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP55118167A priority Critical patent/JPS5742248A/en
Publication of JPS5742248A publication Critical patent/JPS5742248A/en
Pending legal-status Critical Current

Links

Landscapes

  • Maintenance And Management Of Digital Transmission (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

PURPOSE:To make automatic switching of a communication system efficiently at failures with a simple constitution, by using a carrier detection function, in a data communication system having a duplex system. CONSTITUTION:When a communication line 13a from an MODEM12a1 to an MODEM12a2 is cut off, a carrier detection signal outputted from the MODEM12a2 is turned off, and a changeover device 142 changes over the connection consisting of a data terminal device 112 and the MODEM12b2. Carriers are transmitted from the MODEM12b2, it is detected with the MODEM12b1 and the carrier detection signal outputted from the MODEM12b1 is turned on and a changeover device 141 changes over the connection consisting of a data terminal 111 and the MODEM12b1. As a result, the data terminal devices 111, 112 are automatically connected from the communication system A to the system B.
JP55118167A 1980-08-27 1980-08-27 Switching device for communication system Pending JPS5742248A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55118167A JPS5742248A (en) 1980-08-27 1980-08-27 Switching device for communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55118167A JPS5742248A (en) 1980-08-27 1980-08-27 Switching device for communication system

Publications (1)

Publication Number Publication Date
JPS5742248A true JPS5742248A (en) 1982-03-09

Family

ID=14729765

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55118167A Pending JPS5742248A (en) 1980-08-27 1980-08-27 Switching device for communication system

Country Status (1)

Country Link
JP (1) JPS5742248A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60163551A (en) * 1984-02-03 1985-08-26 Nec Corp Line switching system
JPS6148249A (en) * 1984-08-13 1986-03-08 Nec Corp Line switching device
JPS61208330A (en) * 1985-03-13 1986-09-16 Mitsubishi Electric Corp Controller for redundant communication line
JPS61269442A (en) * 1985-05-23 1986-11-28 Tokyo Electric Co Ltd Switching device for data transmission loop
JPS6258746A (en) * 1985-09-06 1987-03-14 Nippon Telegr & Teleph Corp <Ntt> Circuit backup system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60163551A (en) * 1984-02-03 1985-08-26 Nec Corp Line switching system
JPS6148249A (en) * 1984-08-13 1986-03-08 Nec Corp Line switching device
JPH0438172B2 (en) * 1984-08-13 1992-06-23 Nippon Electric Co
JPS61208330A (en) * 1985-03-13 1986-09-16 Mitsubishi Electric Corp Controller for redundant communication line
JPS61269442A (en) * 1985-05-23 1986-11-28 Tokyo Electric Co Ltd Switching device for data transmission loop
JPS6258746A (en) * 1985-09-06 1987-03-14 Nippon Telegr & Teleph Corp <Ntt> Circuit backup system

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