CA2350281A1 - Alarm and test system for a digital main line - Google Patents
Alarm and test system for a digital main line Download PDFInfo
- 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
Links
- 230000005540 biological transmission Effects 0.000 abstract 2
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
Landscapes
- 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.
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.
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)
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 |
-
1991
- 1991-08-01 CA CA002350281A patent/CA2350281C/en not_active Expired - Lifetime
Cited By (1)
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
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKEX | Expiry |