CA2350281A1 - Alarm and test system for a digital main line - Google Patents

Alarm and test system for a digital main line Download PDF

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Publication number
CA2350281A1
CA2350281A1 CA002350281A CA2350281A CA2350281A1 CA 2350281 A1 CA2350281 A1 CA 2350281A1 CA 002350281 A CA002350281 A CA 002350281A CA 2350281 A CA2350281 A CA 2350281A CA 2350281 A1 CA2350281 A1 CA 2350281A1
Authority
CA
Canada
Prior art keywords
signal
twisted pair
ksymbols
converts
remote terminal
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.)
Granted
Application number
CA002350281A
Other languages
French (fr)
Other versions
CA2350281C (en
Inventor
David C. Bliven
Anthony Vranicar
Philip B. Vail
Gerald L. Shimirak
Julian S. Mullaney
Jan J. Erreygers
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.)
Raychem Corp
Original Assignee
Individual
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
Priority claimed from US07/584,325 external-priority patent/US5111497A/en
Application filed by Individual filed Critical Individual
Priority claimed from CA002091067A external-priority patent/CA2091067C/en
Publication of CA2350281A1 publication Critical patent/CA2350281A1/en
Application granted granted Critical
Publication of CA2350281C publication Critical patent/CA2350281C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Facsimiles In General (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

A test system directed to apparatus for transmitting and receiving multiple telephone transmission signals over a single twisted pair (100). The system converts an analog signal from a local switching (112) station to an 80 ksymbols/sec signal for transmission over a twisted pair by a line card (104). A remote terminal (102) converts the 80 ksymbols/sec signal back into a con-ventional analog signal for use in conventional telephone (108), facsimile or other related equipment. The test equipment separ-ately tests the entire system, the tine card portion of the system, the remote terminal portion of the system, and the twisted pair.
An improved 2-to-4-wire hybrid coupling circuit (202) also is disclosed. The improved circuit has 2 extra "wing" coils attached to the known output transformer, the added coils improving the signal strength of the received signal as well as effectively cancelling out feedback from the output amplifier.
CA002350281A 1990-09-04 1991-08-01 Alarm and test system for a digital main line Expired - Lifetime CA2350281C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US57900690A 1990-09-04 1990-09-04
US579,006 1990-09-04
US584,325 1990-09-17
US07/584,325 US5111497A (en) 1990-09-17 1990-09-17 Alarm and test system for a digital added main line
CA002091067A CA2091067C (en) 1990-09-04 1991-08-01 Alarm and test system for a digital main line

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002091067A Division CA2091067C (en) 1990-09-04 1991-08-01 Alarm and test system for a digital main line

Publications (2)

Publication Number Publication Date
CA2350281A1 true CA2350281A1 (en) 1992-03-19
CA2350281C CA2350281C (en) 2004-01-20

Family

ID=27169369

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002350281A Expired - Lifetime CA2350281C (en) 1990-09-04 1991-08-01 Alarm and test system for a digital main line

Country Status (1)

Country Link
CA (1) CA2350281C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114694837A (en) * 2020-12-31 2022-07-01 浙江凡聚科技有限公司 Cognitive dysfunction training system based on virtual reality

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114694837A (en) * 2020-12-31 2022-07-01 浙江凡聚科技有限公司 Cognitive dysfunction training system based on virtual reality

Also Published As

Publication number Publication date
CA2350281C (en) 2004-01-20

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Legal Events

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EEER Examination request
MKEX Expiry