JPS561646A - Channel switching system - Google Patents

Channel switching system

Info

Publication number
JPS561646A
JPS561646A JP7720479A JP7720479A JPS561646A JP S561646 A JPS561646 A JP S561646A JP 7720479 A JP7720479 A JP 7720479A JP 7720479 A JP7720479 A JP 7720479A JP S561646 A JPS561646 A JP S561646A
Authority
JP
Japan
Prior art keywords
circuit
channel switching
detecting circuit
common control
main wire
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
JP7720479A
Other languages
Japanese (ja)
Inventor
Kanehisa Kobayashi
Eiichi Sato
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 JP7720479A priority Critical patent/JPS561646A/en
Publication of JPS561646A publication Critical patent/JPS561646A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
    • H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
    • H04Q3/625—Arrangements in the private branch exchange

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

PURPOSE:To ensure the easy setting of the talking circuit between the main wire and the specific extension at the abnormal time, by installing the abnormal working detecting circuit of the common control circuit and the channel switching circuit in the PBX. CONSTITUTION:The abnormal working state of the common control circuit is detected at the detecting circuit, and the channel switching circuit is actuated with the output of the detecting circuit. Thus the extension telephone is connected directly to the main wire with no intervention of the PBX switch. As a result, the extension telephone can carry out the originating and terminating.
JP7720479A 1979-06-19 1979-06-19 Channel switching system Pending JPS561646A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7720479A JPS561646A (en) 1979-06-19 1979-06-19 Channel switching system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7720479A JPS561646A (en) 1979-06-19 1979-06-19 Channel switching system

Publications (1)

Publication Number Publication Date
JPS561646A true JPS561646A (en) 1981-01-09

Family

ID=13627289

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7720479A Pending JPS561646A (en) 1979-06-19 1979-06-19 Channel switching system

Country Status (1)

Country Link
JP (1) JPS561646A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6388947A (en) * 1986-10-02 1988-04-20 Fujitsu Ltd Trouble processing method for exchanging system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6388947A (en) * 1986-10-02 1988-04-20 Fujitsu Ltd Trouble processing method for exchanging system

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