JPS57181259A - Audio out-band signal transmission and reception system - Google Patents

Audio out-band signal transmission and reception system

Info

Publication number
JPS57181259A
JPS57181259A JP6670981A JP6670981A JPS57181259A JP S57181259 A JPS57181259 A JP S57181259A JP 6670981 A JP6670981 A JP 6670981A JP 6670981 A JP6670981 A JP 6670981A JP S57181259 A JPS57181259 A JP S57181259A
Authority
JP
Japan
Prior art keywords
audio
band signal
signal
audio out
modem
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
JP6670981A
Other languages
Japanese (ja)
Inventor
Koji Yamamoto
Tadakazu Morisawa
Minoru Narita
Isao Kawashima
Osamu Miyagishi
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP6670981A priority Critical patent/JPS57181259A/en
Publication of JPS57181259A publication Critical patent/JPS57181259A/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 reduce the cost of facilities by installing a carrier detector for detecting the carrier of an audio out-band signal that a subscriber sends to a center device, and then connecting a free modem after detecting said signal by the detector. CONSTITUTION:An audio out-band signal sent out of a telephone set which has a transmitting and receiving function for the audio outband signal is detected through a subscriber circuit 2 by a carrier detector 3, and its information is led to a CPU12 through a controller 5. The CPU12 searches for a free modem 7 and then opens the switch of a channel switch network 11 to connect the modem 7. As a result, the need to provide modems, installed in a center device for the transmission and reception of the audio outband signal, corresponding to subscribers is eliminated and this is used in common by plural subscribers, thus reducing the cost of the facilities greatly.
JP6670981A 1981-04-30 1981-04-30 Audio out-band signal transmission and reception system Pending JPS57181259A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6670981A JPS57181259A (en) 1981-04-30 1981-04-30 Audio out-band signal transmission and reception system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6670981A JPS57181259A (en) 1981-04-30 1981-04-30 Audio out-band signal transmission and reception system

Publications (1)

Publication Number Publication Date
JPS57181259A true JPS57181259A (en) 1982-11-08

Family

ID=13323718

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6670981A Pending JPS57181259A (en) 1981-04-30 1981-04-30 Audio out-band signal transmission and reception system

Country Status (1)

Country Link
JP (1) JPS57181259A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62116058A (en) * 1985-11-15 1987-05-27 Matsushita Electric Ind Co Ltd Line terminal equipment

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49106208A (en) * 1973-02-09 1974-10-08
JPS5528606A (en) * 1978-08-21 1980-02-29 Nippon Telegr & Teleph Corp <Ntt> Transmission system of subscriber line

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49106208A (en) * 1973-02-09 1974-10-08
JPS5528606A (en) * 1978-08-21 1980-02-29 Nippon Telegr & Teleph Corp <Ntt> Transmission system of subscriber line

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62116058A (en) * 1985-11-15 1987-05-27 Matsushita Electric Ind Co Ltd Line terminal equipment

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