Matches in DBpedia 2016-04 for { <http://wikidata.dbpedia.org/resource/Q4533329> ?p ?o }
Showing triples 1 to 46 of
46
with 100 triples per page.
- Q4533329 subject Q10210014.
- Q4533329 subject Q5470782.
- Q4533329 subject Q6468189.
- Q4533329 subject Q7215676.
- Q4533329 subject Q7216224.
- Q4533329 subject Q8488088.
- Q4533329 abstract "Signal reflection occurs when a signal is transmitted along a transmission medium, such as a copper cable or an optical fiber. Some of the signal power may be reflected back to its origin rather than being carried all the way along the cable to the far end. This happens because imperfections in the cable cause impedance mismatches and non-linear changes in the cable characteristics. These abrupt changes in characteristics cause some of the transmitted signal to be reflected. In radio frequency (RF) practice this is often measured in a dimensionless ratio known as voltage standing wave ratio (VSWR) with a VSWR bridge. The ratio of energy bounced back depends on the impedance mismatch. Mathematically, it is defined using the reflection coefficient.Because the principles are the same, this concept is perhaps easiest to understand when considering an optical fiber. Imperfections in the glass create mirrors that reflect the light back along the fiber.Impedance discontinuities cause attenuation, attenuation distortion, standing waves, ringing and other effects because a portion of a transmitted signal will be reflected back to the transmitting device rather than continuing to the receiver, much like an echo. This effect is compounded if multiple discontinuities cause additional portions of the remaining signal to be reflected back to the transmitter. This is a fundamental problem with the daisy chain method of connecting electronic components. When a returning reflection strikes another discontinuity, some of the signal rebounds in the original signal direction, creating multiple echo effects. These forward echoes strike the receiver at different intervals making it difficult for the receiver to accurately detect data values on the signal. The effects can resemble those of jitter.Because damage to the cable can cause reflections, an instrument called an electrical time-domain reflectometer (ETDR; for electrical cables) or an optical time-domain reflectometer (OTDR; for optical cables) can be used to locate the damaged part of a cable. These instruments work by sending a short pulsed signal into the cable and measuring how long the reflection takes to return. If only reflection magnitudes are desired, however, and exact fault locations are not required, VSWR bridges perform a similar but lesser function for RF cables.The combination of the effects of signal attenuation and impedance discontinuities on a communications link is called insertion loss. Proper network operation depends on constant characteristic impedance in all cables and connectors, with no impedance discontinuities in the entire cable system. When a sufficient degree of impedance matching is not practical, echo suppressors or echo cancellers, or both, can sometimes reduce the problems.The Bergeron Diagram method, valid for both linear and non-linear models, evaluates the reflection's effects in an electric line.".
- Q4533329 thumbnail Megger_Time-Domain_Reflectometer_MTDR1.jpg?width=300.
- Q4533329 wikiPageWikiLink Q10210014.
- Q4533329 wikiPageWikiLink Q104534.
- Q4533329 wikiPageWikiLink Q1052698.
- Q4533329 wikiPageWikiLink Q1157702.
- Q4533329 wikiPageWikiLink Q1164612.
- Q4533329 wikiPageWikiLink Q1172466.
- Q4533329 wikiPageWikiLink Q123300.
- Q4533329 wikiPageWikiLink Q159391.
- Q4533329 wikiPageWikiLink Q162.
- Q4533329 wikiPageWikiLink Q17034193.
- Q4533329 wikiPageWikiLink Q1761108.
- Q4533329 wikiPageWikiLink Q176509.
- Q4533329 wikiPageWikiLink Q179043.
- Q4533329 wikiPageWikiLink Q182767.
- Q4533329 wikiPageWikiLink Q1852282.
- Q4533329 wikiPageWikiLink Q188364.
- Q4533329 wikiPageWikiLink Q190157.
- Q4533329 wikiPageWikiLink Q230187.
- Q4533329 wikiPageWikiLink Q2357982.
- Q4533329 wikiPageWikiLink Q3396184.
- Q4533329 wikiPageWikiLink Q365756.
- Q4533329 wikiPageWikiLink Q4503810.
- Q4533329 wikiPageWikiLink Q4818244.
- Q4533329 wikiPageWikiLink Q4891630.
- Q4533329 wikiPageWikiLink Q503560.
- Q4533329 wikiPageWikiLink Q5470782.
- Q4533329 wikiPageWikiLink Q5473269.
- Q4533329 wikiPageWikiLink Q580729.
- Q4533329 wikiPageWikiLink Q6468189.
- Q4533329 wikiPageWikiLink Q7215676.
- Q4533329 wikiPageWikiLink Q7216224.
- Q4533329 wikiPageWikiLink Q7307297.
- Q4533329 wikiPageWikiLink Q838055.
- Q4533329 wikiPageWikiLink Q8488088.
- Q4533329 wikiPageWikiLink Q947396.
- Q4533329 comment "Signal reflection occurs when a signal is transmitted along a transmission medium, such as a copper cable or an optical fiber. Some of the signal power may be reflected back to its origin rather than being carried all the way along the cable to the far end. This happens because imperfections in the cable cause impedance mismatches and non-linear changes in the cable characteristics. These abrupt changes in characteristics cause some of the transmitted signal to be reflected.".
- Q4533329 label "Signal reflection".
- Q4533329 depiction Megger_Time-Domain_Reflectometer_MTDR1.jpg.
