JPS5665558A - Channel control system in button telephone set - Google Patents

Channel control system in button telephone set

Info

Publication number
JPS5665558A
JPS5665558A JP14162179A JP14162179A JPS5665558A JP S5665558 A JPS5665558 A JP S5665558A JP 14162179 A JP14162179 A JP 14162179A JP 14162179 A JP14162179 A JP 14162179A JP S5665558 A JPS5665558 A JP S5665558A
Authority
JP
Japan
Prior art keywords
switch
turn
thyristor
telephone set
current
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
JP14162179A
Other languages
Japanese (ja)
Other versions
JPS6056033B2 (en
Inventor
Kazuyuki Yamamoto
Teruyuki Kubo
Isao Kawashima
Koichi Sekiguchi
Hideaki Naganami
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 JP54141621A priority Critical patent/JPS6056033B2/en
Publication of JPS5665558A publication Critical patent/JPS5665558A/en
Publication of JPS6056033B2 publication Critical patent/JPS6056033B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/71—Substation extension arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To prevent turn-off of the switch at the momentary interruption of trunk line current, by constituting the channel selection switch with photodriven PNPN semiconductor elements and applying trigger current to this switch via memory circuits. CONSTITUTION:When an FF54 is set, the output drives a gate circuit 5-1 of a photocoupling thyristor switch element 51 to turn on thyristor switch elements 51-2 and 51-3. As a result, office current flows, transmission, response and communication are enabled in the channel lines 21 of a telephone set. Next, in case of the end of call, after the FF54 is reset, the contact 52 of a relay is momentarily in break to turn off the thyristor switches 51. Further, if the momentary interruption of office line current is caused with FF54 set, the retriggered thyristor switch 51 is returned to ON-state.
JP54141621A 1979-11-01 1979-11-01 Call path control method in button telephone equipment Expired JPS6056033B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54141621A JPS6056033B2 (en) 1979-11-01 1979-11-01 Call path control method in button telephone equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54141621A JPS6056033B2 (en) 1979-11-01 1979-11-01 Call path control method in button telephone equipment

Publications (2)

Publication Number Publication Date
JPS5665558A true JPS5665558A (en) 1981-06-03
JPS6056033B2 JPS6056033B2 (en) 1985-12-07

Family

ID=15296294

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54141621A Expired JPS6056033B2 (en) 1979-11-01 1979-11-01 Call path control method in button telephone equipment

Country Status (1)

Country Link
JP (1) JPS6056033B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0442824Y2 (en) * 1985-09-24 1992-10-09

Also Published As

Publication number Publication date
JPS6056033B2 (en) 1985-12-07

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