JPS5583397A - Bothway collision prevention system of bothway calling trunk - Google Patents

Bothway collision prevention system of bothway calling trunk

Info

Publication number
JPS5583397A
JPS5583397A JP15889278A JP15889278A JPS5583397A JP S5583397 A JPS5583397 A JP S5583397A JP 15889278 A JP15889278 A JP 15889278A JP 15889278 A JP15889278 A JP 15889278A JP S5583397 A JPS5583397 A JP S5583397A
Authority
JP
Japan
Prior art keywords
relay
bothway
calling
trunk
bwt
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
JP15889278A
Other languages
Japanese (ja)
Inventor
Kiyobumi Hayashi
Saburo Nishinomiya
Kiyoaki Nakayama
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP15889278A priority Critical patent/JPS5583397A/en
Publication of JPS5583397A publication Critical patent/JPS5583397A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To prevent bothway collision by a simple method only by providing a common start supervisory relay to several bothway calling trunks by making use of the start supervisory relay as a pattern-relay control gate relay. CONSTITUTION:In trunk common circuit COM of an exchange brought under pattern, control, start supervisory relay SP is provided and through the make contact of this relay SP, several bothway callinh trunks BWT are connected. When an office exchange is placed in a calling state at the time of incoming, relay R operates and relay SP is OFF being connected via make contact P<0> of gate relay P. To connect calling subscriber SUB to calling trunk BWT next, a central controller selects calling trunk BWT and before network NW is bus-closed, corresponding relay P is operated to read the state of relay SP via scanner SCN, so that when incoming arrives from the office exchange, relay SP is put into operation.
JP15889278A 1978-12-20 1978-12-20 Bothway collision prevention system of bothway calling trunk Pending JPS5583397A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15889278A JPS5583397A (en) 1978-12-20 1978-12-20 Bothway collision prevention system of bothway calling trunk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15889278A JPS5583397A (en) 1978-12-20 1978-12-20 Bothway collision prevention system of bothway calling trunk

Publications (1)

Publication Number Publication Date
JPS5583397A true JPS5583397A (en) 1980-06-23

Family

ID=15681652

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15889278A Pending JPS5583397A (en) 1978-12-20 1978-12-20 Bothway collision prevention system of bothway calling trunk

Country Status (1)

Country Link
JP (1) JPS5583397A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5487110A (en) * 1994-02-01 1996-01-23 Dsc Communications Corporation Apparatus and method for virtual private telephone line with automatic ring down

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5487110A (en) * 1994-02-01 1996-01-23 Dsc Communications Corporation Apparatus and method for virtual private telephone line with automatic ring down
US5577113A (en) * 1994-02-01 1996-11-19 Dsc Communications Corporation Apparatus and method for virtual private telephone line with automatic ring down

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