JPH0123037B2 - - Google Patents

Info

Publication number
JPH0123037B2
JPH0123037B2 JP55182790A JP18279080A JPH0123037B2 JP H0123037 B2 JPH0123037 B2 JP H0123037B2 JP 55182790 A JP55182790 A JP 55182790A JP 18279080 A JP18279080 A JP 18279080A JP H0123037 B2 JPH0123037 B2 JP H0123037B2
Authority
JP
Japan
Prior art keywords
circuit
button
transistor
signal
generation circuit
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.)
Expired
Application number
JP55182790A
Other languages
English (en)
Japanese (ja)
Other versions
JPS57107664A (en
Inventor
Akira Shinoi
Keisuke Mochizuki
Yoshimi Suzuki
Masaru Kudo
Wataru Hashimoto
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP55182790A priority Critical patent/JPS57107664A/ja
Priority to US06/328,451 priority patent/US4392024A/en
Priority to AU78695/81A priority patent/AU546471B2/en
Priority to GB8138546A priority patent/GB2091066B/en
Publication of JPS57107664A publication Critical patent/JPS57107664A/ja
Publication of JPH0123037B2 publication Critical patent/JPH0123037B2/ja
Granted 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
    • H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line
    • H04M9/007—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line wherein the key telephone sets are star-connected to a central unit by a limited number of lines

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
JP55182790A 1980-12-25 1980-12-25 Electronic button telephone set Granted JPS57107664A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP55182790A JPS57107664A (en) 1980-12-25 1980-12-25 Electronic button telephone set
US06/328,451 US4392024A (en) 1980-12-25 1981-12-08 Electronic key telephone set circuit for permitting dialing during failure of commercial power supplied to the set
AU78695/81A AU546471B2 (en) 1980-12-25 1981-12-21 Electronic key telephone set
GB8138546A GB2091066B (en) 1980-12-25 1981-12-22 Electronic key telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55182790A JPS57107664A (en) 1980-12-25 1980-12-25 Electronic button telephone set

Publications (2)

Publication Number Publication Date
JPS57107664A JPS57107664A (en) 1982-07-05
JPH0123037B2 true JPH0123037B2 (US20110009641A1-20110113-C00256.png) 1989-04-28

Family

ID=16124460

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55182790A Granted JPS57107664A (en) 1980-12-25 1980-12-25 Electronic button telephone set

Country Status (4)

Country Link
US (1) US4392024A (US20110009641A1-20110113-C00256.png)
JP (1) JPS57107664A (US20110009641A1-20110113-C00256.png)
AU (1) AU546471B2 (US20110009641A1-20110113-C00256.png)
GB (1) GB2091066B (US20110009641A1-20110113-C00256.png)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59231993A (ja) * 1983-06-15 1984-12-26 Iwatsu Electric Co Ltd 加入者側電話装置
GB8413208D0 (en) * 1984-05-23 1984-06-27 Plessey Co Plc Telecommunication systems
JPH0738735B2 (ja) * 1985-04-30 1995-04-26 岩崎通信機株式会社 ボタン電話装置
JPS62200852A (ja) * 1986-02-28 1987-09-04 Toshiba Corp ボタン電話装置の停電電話機
JPS6472692A (en) * 1987-09-14 1989-03-17 Tamura Electric Works Ltd Key telephone system
US4853949A (en) * 1988-03-24 1989-08-01 Rockwell International Corporation Fail safe voice system for integrated services for digital network subscribers
DE3812666A1 (de) * 1988-04-15 1989-11-02 Siemens Ag Schaltungsanordnung zur umschaltung einer vermittlungseinrichtung vom normalen vermittlungsbetrieb in einen notbetrieb und umgekehrt
JPH02109454A (ja) * 1988-10-18 1990-04-23 Nec Corp 電話機付きファクシミリ装置
JPH03293845A (ja) * 1990-04-11 1991-12-25 Toshiba Corp 停電対応電話端末用ダイヤル装置
US5235635A (en) * 1990-09-27 1993-08-10 Advanced Micro Devices, Inc. Keypad monitor with keypad activity-based activation
KR0165201B1 (ko) * 1995-11-08 1999-02-01 김광호 키폰시스템에서 정전시 대피 국선 복귀회로 및 방법
GB0128890D0 (en) * 2001-12-03 2002-01-23 Gbd Comm Ltd Telephone line selection

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5141905A (ja) * 1974-10-05 1976-04-08 Oki Electric Ind Co Ltd Deetadensohoshiki
JPS5148611A (en) * 1974-10-18 1976-04-26 Chisso Corp Karubonsanesuteruno seizoho
JPS5437217U (US20110009641A1-20110113-C00256.png) * 1977-08-17 1979-03-10

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU521265B2 (en) * 1979-08-20 1982-03-25 Nippon Telegraph & Telephone Corporation Key telephone system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5141905A (ja) * 1974-10-05 1976-04-08 Oki Electric Ind Co Ltd Deetadensohoshiki
JPS5148611A (en) * 1974-10-18 1976-04-26 Chisso Corp Karubonsanesuteruno seizoho
JPS5437217U (US20110009641A1-20110113-C00256.png) * 1977-08-17 1979-03-10

Also Published As

Publication number Publication date
GB2091066A (en) 1982-07-21
AU7869581A (en) 1982-07-01
JPS57107664A (en) 1982-07-05
GB2091066B (en) 1984-07-18
US4392024A (en) 1983-07-05
AU546471B2 (en) 1985-09-05

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