JPH0238550Y2 - - Google Patents

Info

Publication number
JPH0238550Y2
JPH0238550Y2 JP1981044795U JP4479581U JPH0238550Y2 JP H0238550 Y2 JPH0238550 Y2 JP H0238550Y2 JP 1981044795 U JP1981044795 U JP 1981044795U JP 4479581 U JP4479581 U JP 4479581U JP H0238550 Y2 JPH0238550 Y2 JP H0238550Y2
Authority
JP
Japan
Prior art keywords
transformer
diode bridge
signal
resistor
current source
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
JP1981044795U
Other languages
English (en)
Japanese (ja)
Other versions
JPS57158250U (en, 2012
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 filed Critical
Priority to JP1981044795U priority Critical patent/JPH0238550Y2/ja
Publication of JPS57158250U publication Critical patent/JPS57158250U/ja
Application granted granted Critical
Publication of JPH0238550Y2 publication Critical patent/JPH0238550Y2/ja
Expired legal-status Critical Current

Links

Landscapes

  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Interface Circuits In Exchanges (AREA)
JP1981044795U 1981-03-30 1981-03-30 Expired JPH0238550Y2 (en, 2012)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1981044795U JPH0238550Y2 (en, 2012) 1981-03-30 1981-03-30

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1981044795U JPH0238550Y2 (en, 2012) 1981-03-30 1981-03-30

Publications (2)

Publication Number Publication Date
JPS57158250U JPS57158250U (en, 2012) 1982-10-05
JPH0238550Y2 true JPH0238550Y2 (en, 2012) 1990-10-17

Family

ID=29841715

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1981044795U Expired JPH0238550Y2 (en, 2012) 1981-03-30 1981-03-30

Country Status (1)

Country Link
JP (1) JPH0238550Y2 (en, 2012)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59121961U (ja) * 1983-02-03 1984-08-16 日本電信電話株式会社 線路インタフエ−ス回路

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE788085A (fr) * 1971-11-15 1973-02-28 Gen Datacomm Ind Inc Circuit de maintien de ligne telephonique

Also Published As

Publication number Publication date
JPS57158250U (en, 2012) 1982-10-05

Similar Documents

Publication Publication Date Title
JPH0453474B2 (en, 2012)
EP0324975A2 (en) Transmission system for telephone communication or data transfer
US4756021A (en) Telephone set
JPH0238550Y2 (en, 2012)
JPH04233891A (ja) ボタン電話用インタフェース装置
JPH0728436B2 (ja) 構内電話交換機
US4464542A (en) Multifunctional communication terminal connected to two telephone lines and with partial remote supply
JPH06205131A (ja) モデムを有する電話装置
US4175216A (en) Intercom calling apparatus in a key telephone system
US3576401A (en) Bridging units for terminating leased lines in telephone line circuits
US4035588A (en) Right-of-way control circuit for key telephone intercommunication system
JPS62200852A (ja) ボタン電話装置の停電電話機
WO2000072568A9 (en) Computer - telephone interface method and apparatus
JP2637086B2 (ja) 電話システム
JPH0537592Y2 (en, 2012)
JPS6328554B2 (en, 2012)
KR840002134B1 (ko) 자동식 전화기 증설장치
JPS589411Y2 (ja) 電話装置におけるハウリング防止回路
JPS63115441A (ja) 電話機
JPS62241493A (ja) ル−プ検出回路
JPH01288145A (ja) 拡声通話終話時のハウリング防止方式
JPH0294992A (ja) ボタン電話装置
JPS635655A (ja) ネツトワ−クタ−ミネ−タ
JPS61267444A (ja) インタ−ホン装置
JPS5925435B2 (ja) ボタン電話装置における局線着信音停止方式