JPS55149590A - Communication system of branch line - Google Patents

Communication system of branch line

Info

Publication number
JPS55149590A
JPS55149590A JP5661079A JP5661079A JPS55149590A JP S55149590 A JPS55149590 A JP S55149590A JP 5661079 A JP5661079 A JP 5661079A JP 5661079 A JP5661079 A JP 5661079A JP S55149590 A JPS55149590 A JP S55149590A
Authority
JP
Japan
Prior art keywords
signal
terminal
center station
line
address
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
JP5661079A
Other languages
Japanese (ja)
Inventor
Kazuyoshi Iijima
Yasuhisa Sakurai
Yukio Murata
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
Original Assignee
NEC 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 Electric Co Ltd filed Critical NEC Corp
Priority to JP5661079A priority Critical patent/JPS55149590A/en
Publication of JPS55149590A publication Critical patent/JPS55149590A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
    • H04Q5/02—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange with direct connection for all subscribers, i.e. party-line systems
    • H04Q5/08—Signalling by continuous ac
    • H04Q5/12—Signalling by continuous ac using combinations of frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To simplify the constitution of the control unit, by taking the control signal delivered to the line as simple combined signal of multifrequency audio signal. CONSTITUTION:A number of terminal units M0-Mn are in branch connection to the line La connected to the center station C. The center station C repetitively transmits the terminal state scanning signal and succeeding terminal address signal to the line La when the line La is vacant. When the signal reception circuit 1 of each terminal, decoder 2 and status monitor control section 3 detect the address of itself among the said address signal, if the terminal itself has the communication request, the response signal is delivered to the center station C via the transmission signal control section 6 and signal transmission section 7 in the timing succeeded to the time immediately after it. After that, the center station C performs various controls specified to the terminal having the response signal. When the terminal is called, the center station C delivers the callout start signal and the callout address and waites for the response from the terminal. The signal to control those controls is constituted with the combination of multifrequency signals entirely.
JP5661079A 1979-05-09 1979-05-09 Communication system of branch line Pending JPS55149590A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5661079A JPS55149590A (en) 1979-05-09 1979-05-09 Communication system of branch line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5661079A JPS55149590A (en) 1979-05-09 1979-05-09 Communication system of branch line

Publications (1)

Publication Number Publication Date
JPS55149590A true JPS55149590A (en) 1980-11-20

Family

ID=13032007

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5661079A Pending JPS55149590A (en) 1979-05-09 1979-05-09 Communication system of branch line

Country Status (1)

Country Link
JP (1) JPS55149590A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5866459A (en) * 1981-10-15 1983-04-20 Toshiba Corp Signal discriminating method
EP0129843A2 (en) * 1983-06-24 1985-01-02 Alcatel N.V. Multiparty line adaptor with privacy feature
JPS6418394A (en) * 1987-07-14 1989-01-23 Sanyo Electric Co Home telephone system
JPH0340653A (en) * 1989-07-07 1991-02-21 Matsushita Electric Ind Co Ltd Wired broadcast telephone set

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5866459A (en) * 1981-10-15 1983-04-20 Toshiba Corp Signal discriminating method
JPH0220032B2 (en) * 1981-10-15 1990-05-07 Tokyo Shibaura Electric Co
EP0129843A2 (en) * 1983-06-24 1985-01-02 Alcatel N.V. Multiparty line adaptor with privacy feature
JPS6418394A (en) * 1987-07-14 1989-01-23 Sanyo Electric Co Home telephone system
JPH0340653A (en) * 1989-07-07 1991-02-21 Matsushita Electric Ind Co Ltd Wired broadcast telephone set

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