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JPS5369504A - Ring trip circuit - Google Patents

Ring trip circuit

Info

Publication number
JPS5369504A
JPS5369504A JP14538476A JP14538476A JPS5369504A JP S5369504 A JPS5369504 A JP S5369504A JP 14538476 A JP14538476 A JP 14538476A JP 14538476 A JP14538476 A JP 14538476A JP S5369504 A JPS5369504 A JP S5369504A
Authority
JP
Japan
Prior art keywords
trip circuit
ring trip
ring
pbx
lpf
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
JP14538476A
Other languages
Japanese (ja)
Inventor
Yasutsugu Nagahama
Hidemi Harada
Katsuaki Fuji
Takeshi Shimizu
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.)
Fujitsu Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd, Nippon Telegraph and Telephone Corp filed Critical Fujitsu Ltd
Priority to JP14538476A priority Critical patent/JPS5369504A/en
Publication of JPS5369504A publication Critical patent/JPS5369504A/en
Pending legal-status Critical Current

Links

Landscapes

  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE: A LPF and a photo coupler are provided in order to eliminate the malfunction due to the trunk of a PBX, etc., thereby realizing the high sensitivity, long life, and miniaturization.
COPYRIGHT: (C)1978,JPO&Japio
JP14538476A 1976-12-02 1976-12-02 Ring trip circuit Pending JPS5369504A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14538476A JPS5369504A (en) 1976-12-02 1976-12-02 Ring trip circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14538476A JPS5369504A (en) 1976-12-02 1976-12-02 Ring trip circuit

Publications (1)

Publication Number Publication Date
JPS5369504A true JPS5369504A (en) 1978-06-21

Family

ID=15383988

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14538476A Pending JPS5369504A (en) 1976-12-02 1976-12-02 Ring trip circuit

Country Status (1)

Country Link
JP (1) JPS5369504A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5728458A (en) * 1980-07-28 1982-02-16 Nec Corp Ring trip circuit
JPS63149657U (en) * 1988-03-03 1988-10-03

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3865992A (en) * 1971-11-17 1975-02-11 Int Standard Electric Corp Electronically controlled ring-trap circuit
US3878340A (en) * 1972-05-22 1975-04-15 Stromberg Carlson Corp Ring trip circuit employing a filter network and a solid state device exhibiting electrical isolation
US3882282A (en) * 1972-07-20 1975-05-06 Jeumont Schneider System for detecting looping of a subscriber{3 s telephone line

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3865992A (en) * 1971-11-17 1975-02-11 Int Standard Electric Corp Electronically controlled ring-trap circuit
US3878340A (en) * 1972-05-22 1975-04-15 Stromberg Carlson Corp Ring trip circuit employing a filter network and a solid state device exhibiting electrical isolation
US3882282A (en) * 1972-07-20 1975-05-06 Jeumont Schneider System for detecting looping of a subscriber{3 s telephone line

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5728458A (en) * 1980-07-28 1982-02-16 Nec Corp Ring trip circuit
JPS63149657U (en) * 1988-03-03 1988-10-03

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