JPS55143893A - Trunk line route switching system - Google Patents

Trunk line route switching system

Info

Publication number
JPS55143893A
JPS55143893A JP5150379A JP5150379A JPS55143893A JP S55143893 A JPS55143893 A JP S55143893A JP 5150379 A JP5150379 A JP 5150379A JP 5150379 A JP5150379 A JP 5150379A JP S55143893 A JPS55143893 A JP S55143893A
Authority
JP
Japan
Prior art keywords
relay
busy
route
leased circuit
originating
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
JP5150379A
Other languages
Japanese (ja)
Inventor
Akihiro Usui
Shingo Harada
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP5150379A priority Critical patent/JPS55143893A/en
Publication of JPS55143893A publication Critical patent/JPS55143893A/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 make service to the called extension possible by using the main wire in case of leased circuit originating route trunk all busy. CONSTITUTION:When a calling extension dials the leased circuit originating number, the earth is given to terminal 7 by the dial number expansion tree, and the leased circuit originating route TT relay is operated, and it is checked whether leased circuit trunks are all busy or not by its contact tt; and in case of busy, the earth is given to terminal TAB' by the leased circuit trunk group, and the trunk all busy indication TAB relay is operated. By the operation of the TAB relay, the operation route of the TT relay is switched to the main wire originating route relay to operate the main wire originating route COT relay.
JP5150379A 1979-04-27 1979-04-27 Trunk line route switching system Pending JPS55143893A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5150379A JPS55143893A (en) 1979-04-27 1979-04-27 Trunk line route switching system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5150379A JPS55143893A (en) 1979-04-27 1979-04-27 Trunk line route switching system

Publications (1)

Publication Number Publication Date
JPS55143893A true JPS55143893A (en) 1980-11-10

Family

ID=12888785

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5150379A Pending JPS55143893A (en) 1979-04-27 1979-04-27 Trunk line route switching system

Country Status (1)

Country Link
JP (1) JPS55143893A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH076203U (en) * 1993-04-30 1995-01-27 株式会社ワコール Lower body clothing for men
JPH076204U (en) * 1993-04-30 1995-01-27 株式会社ワコール Lower body clothing for men

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH076203U (en) * 1993-04-30 1995-01-27 株式会社ワコール Lower body clothing for men
JPH076204U (en) * 1993-04-30 1995-01-27 株式会社ワコール Lower body clothing for men

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