NO930785L - ALARM AND TEST SYSTEM FOR A DIGITAL HEADLINE - Google Patents
ALARM AND TEST SYSTEM FOR A DIGITAL HEADLINEInfo
- Publication number
- NO930785L NO930785L NO93930785A NO930785A NO930785L NO 930785 L NO930785 L NO 930785L NO 93930785 A NO93930785 A NO 93930785A NO 930785 A NO930785 A NO 930785A NO 930785 L NO930785 L NO 930785L
- Authority
- NO
- Norway
- Prior art keywords
- twisted pair
- signal
- symbols
- converts
- remote terminal
- Prior art date
Links
Abstract
Et prøvesystem er knyttet til utstyr for sending og mottagning av flere telefonisk overførte signaler over et enkelt snodd par (100). Systemet omformer et analogt signal fra en lokal telefonsentral (112) til et 80 ksymboler/sek.signal for overføring over et snodd par med et linjekort (104). En fjerntliggende terminal (102) omformer 80 ksymboler/sek.signaler tilbake til et vanlig analogt signal til bruk i vanlig telefon (108), faksimile eller annet beslektet utstyr. Prøveutstyret prøver hver for seg hele systemet, linjekort-delen av systemet, den fjerntliggende termlnaldel av systemet og det snodde par. En forbedret 2-til-4-leder hybrid koblingskrets (202) er også beskrevet. Den forbedrede krets har to ekstra "side"-vikllnger knyttet til den kjente utgangstransformator der de tilføyde viklinger forbedrer signalstyrken på det mottatte signal såvel som på en effektiv måte utligner tilbakekobling fra utgangsforsterkeren.A test system is associated with equipment for transmitting and receiving multiple telephonically transmitted signals over a single twisted pair (100). The system converts an analog signal from a local telephone exchange (112) to an 80 k symbols / sec signal for transmission over a twisted pair with a line card (104). A remote terminal (102) converts 80 x symbols / sec signals back to a conventional analog signal for use in a regular telephone (108), facsimile or other related equipment. The test equipment separately tests the entire system, the line card portion of the system, the remote terminal portion of the system and the twisted pair. An improved 2-to-4-conductor hybrid coupling circuit (202) is also disclosed. The improved circuit has two additional "side" windings associated with the known output transformer where the added windings improve the signal strength of the received signal as well as effectively equalize feedback from the output amplifier.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US57900690A | 1990-09-04 | 1990-09-04 | |
US07/584,325 US5111497A (en) | 1990-09-17 | 1990-09-17 | Alarm and test system for a digital added main line |
PCT/US1991/005475 WO1992004794A2 (en) | 1990-09-04 | 1991-08-01 | Alarm and test system for a digital main line |
Publications (2)
Publication Number | Publication Date |
---|---|
NO930785D0 NO930785D0 (en) | 1993-03-03 |
NO930785L true NO930785L (en) | 1993-04-27 |
Family
ID=27376783
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO93930785A NO930785L (en) | 1990-09-04 | 1993-03-03 | ALARM AND TEST SYSTEM FOR A DIGITAL HEADLINE |
Country Status (1)
Country | Link |
---|---|
NO (1) | NO930785L (en) |
-
1993
- 1993-03-03 NO NO93930785A patent/NO930785L/en unknown
Also Published As
Publication number | Publication date |
---|---|
NO930785D0 (en) | 1993-03-03 |
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