JPS56157170A - Terminal answer signal system of data transmission system - Google Patents

Terminal answer signal system of data transmission system

Info

Publication number
JPS56157170A
JPS56157170A JP6093180A JP6093180A JPS56157170A JP S56157170 A JPS56157170 A JP S56157170A JP 6093180 A JP6093180 A JP 6093180A JP 6093180 A JP6093180 A JP 6093180A JP S56157170 A JPS56157170 A JP S56157170A
Authority
JP
Japan
Prior art keywords
terminal device
signal
answer signal
network control
data transmission
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
JP6093180A
Other languages
Japanese (ja)
Inventor
Kazuhiko Shirai
Ryoji Yoshihara
Junichi Takahashi
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
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone 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 Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP6093180A priority Critical patent/JPS56157170A/en
Publication of JPS56157170A publication Critical patent/JPS56157170A/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)
  • Communication Control (AREA)

Abstract

PURPOSE:To discriminate a terminal device that is answering, by transmitting an answer signal in a different frequency and in the form of a connection completed signal of a data transmitting terminal device which is connected to the same telephone circuit via a network control device. CONSTITUTION:A central device 1 gives an access to a telephone network 3 through a network control device 2 on the center side to catch a no-ringing network control device 5. Then the voltage is applied to the device 5 in the form of a working power source, and either one of the next data transmitting terminal devices 7, 8 and 9 is selected based on a call signal sent from the center device to be connected directly to a telephone circuit. The devices 7, 8 and 9 transmits an answer signal of a prescribed frequency respectively. The center device 1 confirms the selected terminal device from the frequency allotted to the terminal device and then transmits a start signal to the terminal device. The terminal device starts a data transmission based on the start signal.
JP6093180A 1980-05-08 1980-05-08 Terminal answer signal system of data transmission system Pending JPS56157170A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6093180A JPS56157170A (en) 1980-05-08 1980-05-08 Terminal answer signal system of data transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6093180A JPS56157170A (en) 1980-05-08 1980-05-08 Terminal answer signal system of data transmission system

Publications (1)

Publication Number Publication Date
JPS56157170A true JPS56157170A (en) 1981-12-04

Family

ID=13156613

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6093180A Pending JPS56157170A (en) 1980-05-08 1980-05-08 Terminal answer signal system of data transmission system

Country Status (1)

Country Link
JP (1) JPS56157170A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58120364A (en) * 1982-01-13 1983-07-18 Toshiba Corp Terminal extension system
JPS58221542A (en) * 1982-06-17 1983-12-23 Japan Radio Co Ltd Maritime satellite communication system having telex circuit controller

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58120364A (en) * 1982-01-13 1983-07-18 Toshiba Corp Terminal extension system
JPH0129110B2 (en) * 1982-01-13 1989-06-07 Toshiba Kk
JPS58221542A (en) * 1982-06-17 1983-12-23 Japan Radio Co Ltd Maritime satellite communication system having telex circuit controller

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