JPS5394806A - Alarm display circuit for long-time holding of key telephone set - Google Patents

Alarm display circuit for long-time holding of key telephone set

Info

Publication number
JPS5394806A
JPS5394806A JP990177A JP990177A JPS5394806A JP S5394806 A JPS5394806 A JP S5394806A JP 990177 A JP990177 A JP 990177A JP 990177 A JP990177 A JP 990177A JP S5394806 A JPS5394806 A JP S5394806A
Authority
JP
Japan
Prior art keywords
long
alarm display
telephone set
display circuit
key telephone
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
JP990177A
Other languages
Japanese (ja)
Inventor
Kazuyuki Kitagawa
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP990177A priority Critical patent/JPS5394806A/en
Publication of JPS5394806A publication Critical patent/JPS5394806A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/428—Arrangements for placing incoming calls on hold
    • H04M3/4283—Call holding circuits

Landscapes

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

Abstract

PURPOSE:To ensure a clear distinction for a ling-time held circuit by adding a longtime holding alarm display to the intermittence circuit of the holding display lamp with every circuit.
JP990177A 1977-01-31 1977-01-31 Alarm display circuit for long-time holding of key telephone set Pending JPS5394806A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP990177A JPS5394806A (en) 1977-01-31 1977-01-31 Alarm display circuit for long-time holding of key telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP990177A JPS5394806A (en) 1977-01-31 1977-01-31 Alarm display circuit for long-time holding of key telephone set

Publications (1)

Publication Number Publication Date
JPS5394806A true JPS5394806A (en) 1978-08-19

Family

ID=11733005

Family Applications (1)

Application Number Title Priority Date Filing Date
JP990177A Pending JPS5394806A (en) 1977-01-31 1977-01-31 Alarm display circuit for long-time holding of key telephone set

Country Status (1)

Country Link
JP (1) JPS5394806A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56110376A (en) * 1980-02-05 1981-09-01 Toshiba Corp Holding state display system of key telephone set
EP0313562A1 (en) * 1986-06-30 1989-05-03 Anthony Forbes Telephone on-hold device.
JPH01172790U (en) * 1988-05-26 1989-12-07

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56110376A (en) * 1980-02-05 1981-09-01 Toshiba Corp Holding state display system of key telephone set
JPH0114757B2 (en) * 1980-02-05 1989-03-14 Tokyo Shibaura Electric Co
EP0313562A1 (en) * 1986-06-30 1989-05-03 Anthony Forbes Telephone on-hold device.
JPH01172790U (en) * 1988-05-26 1989-12-07

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