JPS5725768A - Power off circuit of telephone exchange - Google Patents

Power off circuit of telephone exchange

Info

Publication number
JPS5725768A
JPS5725768A JP9938980A JP9938980A JPS5725768A JP S5725768 A JPS5725768 A JP S5725768A JP 9938980 A JP9938980 A JP 9938980A JP 9938980 A JP9938980 A JP 9938980A JP S5725768 A JPS5725768 A JP S5725768A
Authority
JP
Japan
Prior art keywords
circuit
relay
line
contacts
service interruption
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
JP9938980A
Other languages
Japanese (ja)
Other versions
JPS5915597B2 (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 JP55099389A priority Critical patent/JPS5915597B2/en
Publication of JPS5725768A publication Critical patent/JPS5725768A/en
Publication of JPS5915597B2 publication Critical patent/JPS5915597B2/en
Expired 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 using a latch type relay for a channel switch of a call line which is switched during the service interruption and thus actuating the latch relay only when the trunk line is put under a noncalling state during the survice interruption to connect the trunk line to a certain terminal. CONSTITUTION:Each talking circuit 9-1 of a telephone 9 is connected to trunk lines 1 and 2 via a channel switch matrix 8, and the line 1 is connected to the circuit 9-1 via contacts 2-2 and 2-3 of a latch type relay 2 as well as to a rectifying circuit connected to a control circuit 10. At the same time, the circuit 10 is connected to a control circuit 9-2 of the telephone 9, and a relay 1 is connected to the circuit 10. The relay 2 connected between the rectifying circuit and the circuit 10 is controlled through contacts 1-1 and 1-2 of the relay 1. Furthermore a series circuit of a Zener diode 3 and the contact 2-1 of the relay 2 is connected to the circuit 10 and the rectifying circuit. Then the relay 2 is actuated only when the operation of the relay 1 is stopped with a noncalling state of the line 1 due to a service interruption, and the line 1 is connected to the circuit 9-1 through the contacts 2-2 and 2-3.
JP55099389A 1980-07-22 1980-07-22 Power outage switching circuit in telephone exchange equipment Expired JPS5915597B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55099389A JPS5915597B2 (en) 1980-07-22 1980-07-22 Power outage switching circuit in telephone exchange equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55099389A JPS5915597B2 (en) 1980-07-22 1980-07-22 Power outage switching circuit in telephone exchange equipment

Publications (2)

Publication Number Publication Date
JPS5725768A true JPS5725768A (en) 1982-02-10
JPS5915597B2 JPS5915597B2 (en) 1984-04-10

Family

ID=14246141

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55099389A Expired JPS5915597B2 (en) 1980-07-22 1980-07-22 Power outage switching circuit in telephone exchange equipment

Country Status (1)

Country Link
JP (1) JPS5915597B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58210787A (en) * 1982-06-01 1983-12-08 Kanda Tsushin Kogyo Kk Power failure countermeasure system of key telephone device
JPS6192094A (en) * 1984-08-23 1986-05-10 ジ−メンス・アクチエンゲゼルシヤフト Circuit device for small-sized constitution exchange

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58210787A (en) * 1982-06-01 1983-12-08 Kanda Tsushin Kogyo Kk Power failure countermeasure system of key telephone device
JPH0237754B2 (en) * 1982-06-01 1990-08-27 Kanda Tsushin Kogyo Kk
JPS6192094A (en) * 1984-08-23 1986-05-10 ジ−メンス・アクチエンゲゼルシヤフト Circuit device for small-sized constitution exchange

Also Published As

Publication number Publication date
JPS5915597B2 (en) 1984-04-10

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