JPS55147865A - Busy indicating circuit of key telephone unit - Google Patents

Busy indicating circuit of key telephone unit

Info

Publication number
JPS55147865A
JPS55147865A JP5525479A JP5525479A JPS55147865A JP S55147865 A JPS55147865 A JP S55147865A JP 5525479 A JP5525479 A JP 5525479A JP 5525479 A JP5525479 A JP 5525479A JP S55147865 A JPS55147865 A JP S55147865A
Authority
JP
Japan
Prior art keywords
telephone set
calling
busy
called
subscriber
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
JP5525479A
Other languages
Japanese (ja)
Other versions
JPS5945320B2 (en
Inventor
Masayoshi Oshima
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP5525479A priority Critical patent/JPS5945320B2/en
Publication of JPS55147865A publication Critical patent/JPS55147865A/en
Publication of JPS5945320B2 publication Critical patent/JPS5945320B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
    • H04M9/003—Transmission of control signals from or to the key telephone set; signalling equipment at key telephone set, e.g. keyboard or display equipment

Abstract

PURPOSE:To obtain a simple-constitution and economical busy indicating circuit where waste of time of use stop can be omitted, by discriminating the busy state of a called subscriber and by indicating busy to a calling subscriber visually at an extension mutual calling time. CONSTITUTION:When telephone set 1 and telephone set 2 are denoted as the calling side and the called side respectively, the calling subscriber operates hook switch HS0 and depresses the key for extension line selection to connect control contact LK0 to the ground side and depresses the call button for calling the called subscribed to close contact BK0. At this time, if the called subscriber is not busy, visual indication element LED of calling-side telephone set 1 is lit only during depression of the call button because hook switch HS1 of telephone set 2 is closed. If the called subscriber is busy, visual indication element LED of telephone set 1 is extinguished still because hook switch HS1 of telephone set 2 is opened.
JP5525479A 1979-05-08 1979-05-08 Busy indicator circuit for button telephone equipment Expired JPS5945320B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5525479A JPS5945320B2 (en) 1979-05-08 1979-05-08 Busy indicator circuit for button telephone equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5525479A JPS5945320B2 (en) 1979-05-08 1979-05-08 Busy indicator circuit for button telephone equipment

Publications (2)

Publication Number Publication Date
JPS55147865A true JPS55147865A (en) 1980-11-18
JPS5945320B2 JPS5945320B2 (en) 1984-11-05

Family

ID=12993451

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5525479A Expired JPS5945320B2 (en) 1979-05-08 1979-05-08 Busy indicator circuit for button telephone equipment

Country Status (1)

Country Link
JP (1) JPS5945320B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100474686B1 (en) * 1995-03-31 2005-06-13 삼성전자주식회사 Emergency call notification method during a call

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100474686B1 (en) * 1995-03-31 2005-06-13 삼성전자주식회사 Emergency call notification method during a call

Also Published As

Publication number Publication date
JPS5945320B2 (en) 1984-11-05

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