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JPS562778A - Data communication unit - Google Patents

Data communication unit

Info

Publication number
JPS562778A
JPS562778A JP7881379A JP7881379A JPS562778A JP S562778 A JPS562778 A JP S562778A JP 7881379 A JP7881379 A JP 7881379A JP 7881379 A JP7881379 A JP 7881379A JP S562778 A JPS562778 A JP S562778A
Authority
JP
Japan
Prior art keywords
data communication
subscriber
communication
exchange
service
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
JP7881379A
Other languages
Japanese (ja)
Inventor
Toshihiko Nishimura
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 JP7881379A priority Critical patent/JPS562778A/en
Publication of JPS562778A publication Critical patent/JPS562778A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To make data communication and service possible with a simple constitution without addition of a special unit to the subscriber, by providing a decision timing circuit and a receiving level detecting circuit. CONSTITUTION:Subscriber C20 which has not a function to transmit the communication request signal is connected to exchange 1 of the telephone network having line 5 which connects exchange 1, network control unit 4, and subscriber B3 of exchange 1 which can not perform data communication, and further, data communication unit 7 is connected to exchange 1 by communication line 8 and control line 9. Receiving level detecting circuit 21 to detect the receiving level of communication line 8 is provided in circuit 11 for data communication of communication unit 7, and further, common control circuit 22 equipped with decision timing circuit 23 is provided which sets a time band when it is decided for the call from the telephone network whether the calling side aims as service or data communication. Thus, the receiving level is detected and displayed on service request display equipment 14 without addition of a special unit to the subscriber, and the telephone network can be utilized to perform data communication and service.
JP7881379A 1979-06-21 1979-06-21 Data communication unit Pending JPS562778A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7881379A JPS562778A (en) 1979-06-21 1979-06-21 Data communication unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7881379A JPS562778A (en) 1979-06-21 1979-06-21 Data communication unit

Publications (1)

Publication Number Publication Date
JPS562778A true JPS562778A (en) 1981-01-13

Family

ID=13672272

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7881379A Pending JPS562778A (en) 1979-06-21 1979-06-21 Data communication unit

Country Status (1)

Country Link
JP (1) JPS562778A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5887956A (en) * 1981-11-19 1983-05-25 Nec Corp Automatic response device for public telephone line
JPS5925466A (en) * 1982-08-03 1984-02-09 Nec Corp Sound detection switching system
JPS59160372A (en) * 1983-03-03 1984-09-11 Canon Inc Facsimile equipment
JPS59160365A (en) * 1983-03-03 1984-09-11 Nec Corp Automatic answer detector
JPS59231964A (en) * 1983-06-15 1984-12-26 Fujitsu Ltd Facsimile telephone changeover system
JPS6352559A (en) * 1986-08-22 1988-03-05 Matsushita Electric Ind Co Ltd Line terminal equipment
JPS6363262A (en) * 1986-09-04 1988-03-19 Matsushita Electric Ind Co Ltd Fasimile equipment with automatic answering telephone function
JPS6382156A (en) * 1986-09-26 1988-04-12 Matsushita Electric Ind Co Ltd Line terminal equipment

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5887956A (en) * 1981-11-19 1983-05-25 Nec Corp Automatic response device for public telephone line
JPS5925466A (en) * 1982-08-03 1984-02-09 Nec Corp Sound detection switching system
JPS59160372A (en) * 1983-03-03 1984-09-11 Canon Inc Facsimile equipment
JPS59160365A (en) * 1983-03-03 1984-09-11 Nec Corp Automatic answer detector
JPH055221B2 (en) * 1983-03-03 1993-01-21 Canon Kk
JPS59231964A (en) * 1983-06-15 1984-12-26 Fujitsu Ltd Facsimile telephone changeover system
JPS6328548B2 (en) * 1983-06-15 1988-06-08 Fujitsu Ltd
JPS6352559A (en) * 1986-08-22 1988-03-05 Matsushita Electric Ind Co Ltd Line terminal equipment
JPS6363262A (en) * 1986-09-04 1988-03-19 Matsushita Electric Ind Co Ltd Fasimile equipment with automatic answering telephone function
JPS6382156A (en) * 1986-09-26 1988-04-12 Matsushita Electric Ind Co Ltd Line terminal equipment

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