JPS5725767A - Telephone device - Google Patents

Telephone device

Info

Publication number
JPS5725767A
JPS5725767A JP9938780A JP9938780A JPS5725767A JP S5725767 A JPS5725767 A JP S5725767A JP 9938780 A JP9938780 A JP 9938780A JP 9938780 A JP9938780 A JP 9938780A JP S5725767 A JPS5725767 A JP S5725767A
Authority
JP
Japan
Prior art keywords
switch
line
service interruption
telephone set
circuit
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
JP9938780A
Other languages
Japanese (ja)
Other versions
JPH0213520B2 (en
Inventor
Koichi Sekiguchi
Hideaki Naganami
Kazuyuki Yamamoto
Teruyuki Kubo
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.)
Iwatsu Electric Co Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Iwatsu Electric Co Ltd
Nippon Telegraph and Telephone Corp
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 Iwatsu Electric Co Ltd, Nippon Telegraph and Telephone Corp filed Critical Iwatsu Electric Co Ltd
Priority to JP9938780A priority Critical patent/JPS5725767A/en
Publication of JPS5725767A publication Critical patent/JPS5725767A/en
Publication of JPH0213520B2 publication Critical patent/JPH0213520B2/ja
Granted 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)
  • Devices For Supply Of Signal Current (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To realize a call during a service interruption, by utilizing the supplying cable of the control signal and the power source of a key telephone set for the by- pass purpose during the service interruption, providing a manual changeover switch to the telephone set and thus connecting the trunk line to the by-pass during the service interruption with operation of the switch. CONSTITUTION:A mannual operation switch 14 is connected between a channel switch matrix 8 of a main device 100 connected via a call line 20 and a talking circuit 15 of a key telephone set 200. With operation of the switch 14, the trunk line is connected to the circuit 15 via the line 20 and the matrix 8. Then both the transmission of the control signal and the supply of electric power are carried out with use of a pair of lines 21 between the device 100 and the telephone 200. Thus the switch 14 is operated to perform the changeover when the power supply + is borken due to a service interruption. As a result, the voltage having an opposite polarity to the power source + is supplied to the circuit 15 via a route of diodes 4 and 7, the line 21, a diode 7 and the switch 14 respectively.
JP9938780A 1980-07-22 1980-07-22 Telephone device Granted JPS5725767A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9938780A JPS5725767A (en) 1980-07-22 1980-07-22 Telephone device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9938780A JPS5725767A (en) 1980-07-22 1980-07-22 Telephone device

Publications (2)

Publication Number Publication Date
JPS5725767A true JPS5725767A (en) 1982-02-10
JPH0213520B2 JPH0213520B2 (en) 1990-04-04

Family

ID=14246089

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9938780A Granted JPS5725767A (en) 1980-07-22 1980-07-22 Telephone device

Country Status (1)

Country Link
JP (1) JPS5725767A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0258497A (en) * 1988-08-24 1990-02-27 Canon Inc Telephone set
JP2016034086A (en) * 2014-07-31 2016-03-10 中国電力株式会社 Outage time intra-power station communication system, outage time intra-power station communication method, and cord for outage time intra-power station communication

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52141104A (en) * 1976-05-19 1977-11-25 Iwatsu Electric Co Ltd Private talk system for telephone unit
JPS53116710A (en) * 1977-03-22 1978-10-12 Tamura Electric Works Ltd Button telephone set

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52141104A (en) * 1976-05-19 1977-11-25 Iwatsu Electric Co Ltd Private talk system for telephone unit
JPS53116710A (en) * 1977-03-22 1978-10-12 Tamura Electric Works Ltd Button telephone set

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0258497A (en) * 1988-08-24 1990-02-27 Canon Inc Telephone set
JP2016034086A (en) * 2014-07-31 2016-03-10 中国電力株式会社 Outage time intra-power station communication system, outage time intra-power station communication method, and cord for outage time intra-power station communication

Also Published As

Publication number Publication date
JPH0213520B2 (en) 1990-04-04

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