JPS5698057A - Alternating line concentrator - Google Patents

Alternating line concentrator

Info

Publication number
JPS5698057A
JPS5698057A JP12721780A JP12721780A JPS5698057A JP S5698057 A JPS5698057 A JP S5698057A JP 12721780 A JP12721780 A JP 12721780A JP 12721780 A JP12721780 A JP 12721780A JP S5698057 A JPS5698057 A JP S5698057A
Authority
JP
Japan
Prior art keywords
circuit
make
busy
carrier signal
sent
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
JP12721780A
Other languages
Japanese (ja)
Other versions
JPS5816821B2 (en
Inventor
Taku Kurokawa
Masujiro Matsuo
Yasuo Ishii
Shigeru Ogawa
Shunichi Ito
Daisuke Takei
Yoshio Akutsu
Norio Fujiwara
Akio Otani
Harumi Nagasawa
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.)
JAPANESE NATIONAL RAILWAYS<JNR>
Hitachi Denshi KK
Hitachi Ltd
Japan National Railways
Original Assignee
JAPANESE NATIONAL RAILWAYS<JNR>
Hitachi Denshi KK
Hitachi Ltd
Japan National Railways
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 JAPANESE NATIONAL RAILWAYS<JNR>, Hitachi Denshi KK, Hitachi Ltd, Japan National Railways filed Critical JAPANESE NATIONAL RAILWAYS<JNR>
Priority to JP55127217A priority Critical patent/JPS5816821B2/en
Publication of JPS5698057A publication Critical patent/JPS5698057A/en
Publication of JPS5816821B2 publication Critical patent/JPS5816821B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To set the terminal device under the make-busy state, by closing the make-busy switch by the indication of the control circuit in a line concentrator. CONSTITUTION:The carrier signal sent from the terminal device 1 is received at the interface circuit 11 of the line concentrator 10 and then sent to the crosspoint circuit 17 and also led into the carrier detecting circuit 18. The circuit 18 detects the carrier signal and then sends CD signal to the control circuit 19. The circuit 19 selects the crosspoint of the circuit 17 and sends the carrier signal to the antenna within the outgoing line. In case a certain terminal is put under the make-busy state, the prescribed make-busy switch 22 is closed by the circuit 19. Then the carrier signal is sent to the terminal from the make-busy carrier source 21 via the circuit 11 and the incoming line transmission line 23 to set the terminal device under the make-busy state.
JP55127217A 1980-09-16 1980-09-16 AC line concentrator Expired JPS5816821B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55127217A JPS5816821B2 (en) 1980-09-16 1980-09-16 AC line concentrator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55127217A JPS5816821B2 (en) 1980-09-16 1980-09-16 AC line concentrator

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP50035614A Division JPS51111003A (en) 1975-03-26 1975-03-26 A.c. line concentrator

Publications (2)

Publication Number Publication Date
JPS5698057A true JPS5698057A (en) 1981-08-07
JPS5816821B2 JPS5816821B2 (en) 1983-04-02

Family

ID=14954621

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55127217A Expired JPS5816821B2 (en) 1980-09-16 1980-09-16 AC line concentrator

Country Status (1)

Country Link
JP (1) JPS5816821B2 (en)

Also Published As

Publication number Publication date
JPS5816821B2 (en) 1983-04-02

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