JPS56137759A - Extension call circuit display system of key telephone set - Google Patents

Extension call circuit display system of key telephone set

Info

Publication number
JPS56137759A
JPS56137759A JP3969180A JP3969180A JPS56137759A JP S56137759 A JPS56137759 A JP S56137759A JP 3969180 A JP3969180 A JP 3969180A JP 3969180 A JP3969180 A JP 3969180A JP S56137759 A JPS56137759 A JP S56137759A
Authority
JP
Japan
Prior art keywords
telephone set
display element
key telephone
state display
signal
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
JP3969180A
Other languages
Japanese (ja)
Inventor
Yoshiichi Sano
Shinichi Shibata
Taiji Sato
Takeshi Horiuchi
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP3969180A priority Critical patent/JPS56137759A/en
Publication of JPS56137759A publication Critical patent/JPS56137759A/en
Pending 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 prevent erroneous button operation of a called subscriber, by flickering in a short period only a state display element, which corresponds to a key telephone set called by an extension circuit, while the display element is turned off. CONSTITUTION:The output of OR gate 121 is supplied to series-parallel converting circuit 201C in key telephone set 201 via terminal circuit 151B and down control signal transmission line 601 to demodulate a time-division multiplexed signal and consequently while state display elements 201D3-201D3 are turned on or off, amplifier 201E is controlled to hold voice calling in readiness. Assuming that the state display element provided corresponding to extension circuit 131 is state display element 201D1, element 201D1 turns on-off repeatedly with a flickering signal obtained by OR between a signal of 1Hz in period and a signal of 8Hz in period.
JP3969180A 1980-03-28 1980-03-28 Extension call circuit display system of key telephone set Pending JPS56137759A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3969180A JPS56137759A (en) 1980-03-28 1980-03-28 Extension call circuit display system of key telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3969180A JPS56137759A (en) 1980-03-28 1980-03-28 Extension call circuit display system of key telephone set

Publications (1)

Publication Number Publication Date
JPS56137759A true JPS56137759A (en) 1981-10-27

Family

ID=12560065

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3969180A Pending JPS56137759A (en) 1980-03-28 1980-03-28 Extension call circuit display system of key telephone set

Country Status (1)

Country Link
JP (1) JPS56137759A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06108599A (en) * 1992-09-29 1994-04-19 Misawa Homes Co Ltd Wooden spiral stairway and construction thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06108599A (en) * 1992-09-29 1994-04-19 Misawa Homes Co Ltd Wooden spiral stairway and construction thereof

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