CA1133603A - Circuit d'alarme et de controle a deux fils pour ligne telephonique - Google Patents

Circuit d'alarme et de controle a deux fils pour ligne telephonique

Info

Publication number: CA1133603A
Authority: CA; Canada
Prior art keywords: transistor; alarm; monitor circuit; base; gate
Prior art date: 1978-09-21
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

CA311,820A

Other languages

English (en)

Inventor

Francis P. Keiper, Jr.

Gordon C. Porter

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.)

Lear Siegler Inc

Original Assignee

Lear Siegler Inc

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.)

1978-09-21

Filing date

1978-09-21

Publication date

1982-10-12

1978-09-21 Application filed by Lear Siegler Inc filed Critical Lear Siegler Inc

1978-09-21 Priority to CA311,820A priority Critical patent/CA1133603A/fr

1982-10-12 Application granted granted Critical

1982-10-12 Publication of CA1133603A publication Critical patent/CA1133603A/fr

Status Expired legal-status Critical Current

Links

238000001514 detection method Methods 0.000 claims abstract description 24
239000003990 capacitor Substances 0.000 claims description 10
238000004804 winding Methods 0.000 claims description 8
230000009977 dual effect Effects 0.000 claims description 6
230000000977 initiatory effect Effects 0.000 claims description 5
238000012544 monitoring process Methods 0.000 description 5
238000012935 Averaging Methods 0.000 description 3
230000007257 malfunction Effects 0.000 description 3
238000010586 diagram Methods 0.000 description 2
238000007599 discharging Methods 0.000 description 2
238000009434 installation Methods 0.000 description 2
238000012423 maintenance Methods 0.000 description 2
238000001228 spectrum Methods 0.000 description 2
230000007423 decrease Effects 0.000 description 1
230000003247 decreasing effect Effects 0.000 description 1
230000008520 organization Effects 0.000 description 1
230000003534 oscillatory effect Effects 0.000 description 1
239000007787 solid Substances 0.000 description 1
230000003595 spectral effect Effects 0.000 description 1

Landscapes

Monitoring And Testing Of Transmission In General (AREA)

CA311,820A 1978-09-21 1978-09-21 Circuit d'alarme et de controle a deux fils pour ligne telephonique Expired CA1133603A (fr)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
CA311,820A CA1133603A (fr)	1978-09-21	1978-09-21	Circuit d'alarme et de controle a deux fils pour ligne telephonique

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
CA311,820A CA1133603A (fr)	1978-09-21	1978-09-21	Circuit d'alarme et de controle a deux fils pour ligne telephonique

Publications (1)

Publication Number	Publication Date
CA1133603A true CA1133603A (fr)	1982-10-12

Family

ID=4112419

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA311,820A Expired CA1133603A (fr)	1978-09-21	1978-09-21	Circuit d'alarme et de controle a deux fils pour ligne telephonique

Country Status (1)

Country	Link
CA (1)	CA1133603A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US5056131A (en) *	1990-10-29	1991-10-08	Edward Kanare	Telephone line monitoring circuitry and apparatus

1978
- 1978-09-21 CA CA311,820A patent/CA1133603A/fr not_active Expired

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US5056131A (en) *	1990-10-29	1991-10-08	Edward Kanare	Telephone line monitoring circuitry and apparatus

Similar Documents

Publication	Publication Date	Title
KR960014224B1 (ko)	1996-10-14	전화 가입자 선로 인터페이스 회로용 보호 장치
JPH05196677A (ja)	1993-08-06	駆動回路の故障検出装置
US4384363A (en)	1983-05-17	Transceiver for local network using carrier-sense multiple access/collision detection
US20040257735A1 (en)	2004-12-23	Method and device for short circuit or open load detection
US4056691A (en)	1977-11-01	Telephone subscriber line circuit
US4143287A (en)	1979-03-06	Photo coupling line isolation circuit
CA1133603A (fr)	1982-10-12	Circuit d'alarme et de controle a deux fils pour ligne telephonique
GB2157104A (en)	1985-10-16	Monitoring device for drive amplifiers
US5973416A (en)	1999-10-26	Method for controlling a power supply switch and circuit arrangement for performing the control
JPS5821465B2 (ja)	1983-04-30	試験及び警報装置
JPS6253981B2 (fr)	1987-11-12
WO1988010528A1 (fr)	1988-12-29	Detecteur de cables coaxiaux court-circuites dans des reseaux locaux
US4446340A (en)	1984-05-01	Customer premises loop test unit powered from the normal central office power source
US3683362A (en)	1972-08-08	Protective relay using an indicator and alarm circuit
US4056694A (en)	1977-11-01	Telephone ringing detectors
US4677664A (en)	1987-06-30	Method and apparatus for an improved ring trip detection telephone circuit
US3968477A (en)	1976-07-06	Control apparatus for electrical devices
US4020397A (en)	1977-04-26	Parallel transistor protection circuit
JPS6336588B2 (fr)	1988-07-20
JPS60117843A (ja)	1985-06-25	デ−タ伝送システムの信号出力方式
US6411680B1 (en)	2002-06-25	Telephonic apparatus and input device for telephonic apparatus
US6408071B1 (en)	2002-06-18	Modem line connection circuit and the control circuit
JPS6260032B2 (fr)	1987-12-14
GB2187870A (en)	1987-09-16	Alarm device for detecting abnormality
CA1180140A (fr)	1984-12-27	Generateur de tonalites electronique

Legal Events

Date	Code	Title	Description
1999-10-12	MKEX	Expiry