JPS5480012A - Direct telephone system - Google Patents

Direct telephone system

Info

Publication number
JPS5480012A
JPS5480012A JP14786177A JP14786177A JPS5480012A JP S5480012 A JPS5480012 A JP S5480012A JP 14786177 A JP14786177 A JP 14786177A JP 14786177 A JP14786177 A JP 14786177A JP S5480012 A JPS5480012 A JP S5480012A
Authority
JP
Japan
Prior art keywords
telephone
tlf
stations
enable
telephone system
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
JP14786177A
Other languages
Japanese (ja)
Inventor
Yukio Kimura
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 JP14786177A priority Critical patent/JPS5480012A/en
Publication of JPS5480012A publication Critical patent/JPS5480012A/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)

Abstract

PURPOSE:To enable the direct telephone between A and B stations without using any exclusive circuit by using the junction line trunk for PBX and the like. CONSTITUTION:With the key operation at A and B stations, junction line trunk TLF is switched toward telephone A0 and B0 respectively. And a direct connection is secured between A0 and B0 to enable the free call and speaking from either side. In case TLF is put under the normal state, ordinary extension telephone A1 and B1 are connected by the normal exchange action.
JP14786177A 1977-12-08 1977-12-08 Direct telephone system Pending JPS5480012A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14786177A JPS5480012A (en) 1977-12-08 1977-12-08 Direct telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14786177A JPS5480012A (en) 1977-12-08 1977-12-08 Direct telephone system

Publications (1)

Publication Number Publication Date
JPS5480012A true JPS5480012A (en) 1979-06-26

Family

ID=15439899

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14786177A Pending JPS5480012A (en) 1977-12-08 1977-12-08 Direct telephone system

Country Status (1)

Country Link
JP (1) JPS5480012A (en)

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