JPS5728452A - Common use system of communication line - Google Patents

Common use system of communication line

Info

Publication number
JPS5728452A
JPS5728452A JP10246580A JP10246580A JPS5728452A JP S5728452 A JPS5728452 A JP S5728452A JP 10246580 A JP10246580 A JP 10246580A JP 10246580 A JP10246580 A JP 10246580A JP S5728452 A JPS5728452 A JP S5728452A
Authority
JP
Japan
Prior art keywords
communication
telephone
communication line
digital
devices
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
JP10246580A
Other languages
Japanese (ja)
Inventor
Hisao Sakai
Koichiro Yamaguchi
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP10246580A priority Critical patent/JPS5728452A/en
Publication of JPS5728452A publication Critical patent/JPS5728452A/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)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

PURPOSE:To keep the quality of communication at an important communication, by making a digital data communication and a digital telephone communication with the same communication line at the same time and making an analog telephone communication through switching. CONSTITUTION:At normal state, switching circuits 9a, 9b are switched to MODEMs 8a, 8b with packet exchangers 6a, 6b, and packet communication between facsimile devices 5a, 5b, and digital telephone communication band-compressed with digital telephone devices 4a, 4b between telephone sets 2a, 2b are made on the same communication line 10 via the MODEMs 8a, 8b. When important information is communicated, a switching circuit is switched to analog telephone devices 3a, 3b for analog telephone communication. Thus, an adverse effect such as waiting can be minimized to the data communication and the communication with high quality can be made as required. Such a communication line common system between the data communication and the audio communication can be achieved.
JP10246580A 1980-07-28 1980-07-28 Common use system of communication line Pending JPS5728452A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10246580A JPS5728452A (en) 1980-07-28 1980-07-28 Common use system of communication line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10246580A JPS5728452A (en) 1980-07-28 1980-07-28 Common use system of communication line

Publications (1)

Publication Number Publication Date
JPS5728452A true JPS5728452A (en) 1982-02-16

Family

ID=14328199

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10246580A Pending JPS5728452A (en) 1980-07-28 1980-07-28 Common use system of communication line

Country Status (1)

Country Link
JP (1) JPS5728452A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0279661A (en) * 1988-09-16 1990-03-20 Murata Mach Ltd Facsimile equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0279661A (en) * 1988-09-16 1990-03-20 Murata Mach Ltd Facsimile equipment

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