JPS5617549A - Secret connecting system - Google Patents

Secret connecting system

Info

Publication number
JPS5617549A
JPS5617549A JP9337479A JP9337479A JPS5617549A JP S5617549 A JPS5617549 A JP S5617549A JP 9337479 A JP9337479 A JP 9337479A JP 9337479 A JP9337479 A JP 9337479A JP S5617549 A JPS5617549 A JP S5617549A
Authority
JP
Japan
Prior art keywords
center
call
circuit
telephone
called memory
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
JP9337479A
Other languages
Japanese (ja)
Other versions
JPS6213867B2 (en
Inventor
Toshiaki Tazaki
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 JP9337479A priority Critical patent/JPS5617549A/en
Publication of JPS5617549A publication Critical patent/JPS5617549A/en
Publication of JPS6213867B2 publication Critical patent/JPS6213867B2/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

Abstract

PURPOSE:To secure the perfect connection and protection of the secret, by connecting the recall terminal which is decided previously in response to the called memory to the central processor. CONSTITUTION:A telephone call is given to central processor 80 from maintenance center 20 via exchange circuit network 30 and then rung off after a fixed time. Then this telephone call from center 20 is detected by call detecting circuit 62 in access right checking circuit 60 and at the same time stored in called memory FF63. After this , automatic return telephone circuit 61 transmits the telephone number of center 20 which is known previously, i.e., the telephone number of the called terminal which is decided previously to network control unit 40 via number information signal group 43 and in response to the called memory. And the second call is given to center 20. When the call is connected, connection end signal 44 is turned on. And then data set ready signal 52 is turned on. Accordingly, output 67 is produced at AND circuit 65 to start the communication between processor 80 and center 20.
JP9337479A 1979-07-23 1979-07-23 Secret connecting system Granted JPS5617549A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9337479A JPS5617549A (en) 1979-07-23 1979-07-23 Secret connecting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9337479A JPS5617549A (en) 1979-07-23 1979-07-23 Secret connecting system

Publications (2)

Publication Number Publication Date
JPS5617549A true JPS5617549A (en) 1981-02-19
JPS6213867B2 JPS6213867B2 (en) 1987-03-30

Family

ID=14080521

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9337479A Granted JPS5617549A (en) 1979-07-23 1979-07-23 Secret connecting system

Country Status (1)

Country Link
JP (1) JPS5617549A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01224858A (en) * 1988-03-04 1989-09-07 M M J:Kk Illegal access preventing method for computer and board device used for it
JPH0290335A (en) * 1988-09-28 1990-03-29 Hitachi Ltd Remote operation control system for computer system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01224858A (en) * 1988-03-04 1989-09-07 M M J:Kk Illegal access preventing method for computer and board device used for it
JPH0290335A (en) * 1988-09-28 1990-03-29 Hitachi Ltd Remote operation control system for computer system

Also Published As

Publication number Publication date
JPS6213867B2 (en) 1987-03-30

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