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JPS55135461A - Starting system for terminal unit - Google Patents

Starting system for terminal unit

Info

Publication number
JPS55135461A
JPS55135461A JP4277479A JP4277479A JPS55135461A JP S55135461 A JPS55135461 A JP S55135461A JP 4277479 A JP4277479 A JP 4277479A JP 4277479 A JP4277479 A JP 4277479A JP S55135461 A JPS55135461 A JP S55135461A
Authority
JP
Japan
Prior art keywords
telephone
time
bell
terminal unit
call signal
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
JP4277479A
Other languages
Japanese (ja)
Other versions
JPS6316061B2 (en
Inventor
Hiroshi Sekiguchi
Yukio Ito
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.)
Toshiba Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Toshiba Corp
Nippon Telegraph and Telephone Corp
Tokyo Shibaura 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 Toshiba Corp, Nippon Telegraph and Telephone Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP4277479A priority Critical patent/JPS55135461A/en
Publication of JPS55135461A publication Critical patent/JPS55135461A/en
Publication of JPS6316061B2 publication Critical patent/JPS6316061B2/ja
Granted 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 lessen the load of the subscriber by securing the automatic starting for the terminal unit which is always connected in parallel to the telephone set and without ringing the telephone bell. CONSTITUTION:When the telephone receives the incoming, the potential of L2 at -48V has the polarity inversion to +48V. Then the call signal is transmitted in 0-2 seconds from the time of polarity inversion to ring the bell of telephone 7. In the cace of the data communication, the exchange never transmits the call signal subsequently even though the polarity is inverted at the incoming time. Timer logic circuit 4 starts when the power supply is started from constant voltage circuit 5, and accordingly the polarity inverting time of point B can be regarded as the starting time of the timer action. After this, the detection output of rectifier circuit 3 is monitored for 2 seconds. If the pulse equivalent to the call signal is not detected during that time, the start signal is transmitted from terminal 6. As a result, the terminal unit can be started without ringing the bell of telephone 7.
JP4277479A 1979-04-09 1979-04-09 Starting system for terminal unit Granted JPS55135461A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4277479A JPS55135461A (en) 1979-04-09 1979-04-09 Starting system for terminal unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4277479A JPS55135461A (en) 1979-04-09 1979-04-09 Starting system for terminal unit

Publications (2)

Publication Number Publication Date
JPS55135461A true JPS55135461A (en) 1980-10-22
JPS6316061B2 JPS6316061B2 (en) 1988-04-07

Family

ID=12645308

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4277479A Granted JPS55135461A (en) 1979-04-09 1979-04-09 Starting system for terminal unit

Country Status (1)

Country Link
JP (1) JPS55135461A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60107968A (en) * 1983-11-17 1985-06-13 Nippon Telegr & Teleph Corp <Ntt> Terminal device provided with analog switch circuit
JPS60107967A (en) * 1983-11-17 1985-06-13 Nippon Telegr & Teleph Corp <Ntt> Analog switch circuit
JPS62234452A (en) * 1986-04-04 1987-10-14 Nippon Telegr & Teleph Corp <Ntt> Plural-terminal storing line interface

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50100905A (en) * 1974-01-05 1975-08-11

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50100905A (en) * 1974-01-05 1975-08-11

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60107968A (en) * 1983-11-17 1985-06-13 Nippon Telegr & Teleph Corp <Ntt> Terminal device provided with analog switch circuit
JPS60107967A (en) * 1983-11-17 1985-06-13 Nippon Telegr & Teleph Corp <Ntt> Analog switch circuit
JPS6328550B2 (en) * 1983-11-17 1988-06-08 Nippon Denshin Denwa Kk
JPS6328549B2 (en) * 1983-11-17 1988-06-08 Nippon Denshin Denwa Kk
JPS62234452A (en) * 1986-04-04 1987-10-14 Nippon Telegr & Teleph Corp <Ntt> Plural-terminal storing line interface

Also Published As

Publication number Publication date
JPS6316061B2 (en) 1988-04-07

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