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- Signal_reflection 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 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.".
- Signal_reflection wikiPageID "42728".
- Signal_reflection wikiPageLength "3753".
- Signal_reflection wikiPageOutDegree "42".
- Signal_reflection wikiPageRevisionID "672901803".
- Signal_reflection wikiPageWikiLink Attenuation.
- Signal_reflection wikiPageWikiLink Attenuation_distortion.
- Signal_reflection wikiPageWikiLink Bergeron_Diagram.
- Signal_reflection wikiPageWikiLink Bergeron_diagram.
- Signal_reflection wikiPageWikiLink Category:Electrical_engineering.
- Signal_reflection wikiPageWikiLink Category:Electricity.
- Signal_reflection wikiPageWikiLink Category:Electronic_design.
- Signal_reflection wikiPageWikiLink Category:Geometrical_optics.
- Signal_reflection wikiPageWikiLink Category:Physical_optics.
- Signal_reflection wikiPageWikiLink Category:Radio_electronics.
- Signal_reflection wikiPageWikiLink Characteristic_impedance.
- Signal_reflection wikiPageWikiLink Communications_link.
- Signal_reflection wikiPageWikiLink Crosstalk.
- Signal_reflection wikiPageWikiLink Crosstalk_(electronics).
- Signal_reflection wikiPageWikiLink Daisy_chain_(electrical_engineering).
- Signal_reflection wikiPageWikiLink Data_link.
- Signal_reflection wikiPageWikiLink Digital_subscriber_line.
- Signal_reflection wikiPageWikiLink Echo.
- Signal_reflection wikiPageWikiLink Echo_(phenomenon).
- Signal_reflection wikiPageWikiLink Echo_canceller.
- Signal_reflection wikiPageWikiLink Echo_suppression_and_cancellation.
- Signal_reflection wikiPageWikiLink Echo_suppressor.
- Signal_reflection wikiPageWikiLink Electrical_impedance.
- Signal_reflection wikiPageWikiLink Forward_echo.
- Signal_reflection wikiPageWikiLink Fresnel_equations.
- Signal_reflection wikiPageWikiLink Fresnel_reflection.
- Signal_reflection wikiPageWikiLink Ground-penetrating_radar.
- Signal_reflection wikiPageWikiLink Impedance_matching.
- Signal_reflection wikiPageWikiLink Insertion_loss.
- Signal_reflection wikiPageWikiLink Jitter.
- Signal_reflection wikiPageWikiLink Optical_fiber.
- Signal_reflection wikiPageWikiLink Optical_time-domain_reflectometer.
- Signal_reflection wikiPageWikiLink Optical_time_domain_reflectometer.
- Signal_reflection wikiPageWikiLink Radio_frequency.
- Signal_reflection wikiPageWikiLink Receiver_(radio).
- Signal_reflection wikiPageWikiLink Reflection_coefficient.
- Signal_reflection wikiPageWikiLink Reflections_of_signals_on_conducting_lines.
- Signal_reflection wikiPageWikiLink Reflections_on_copper_lines.
- Signal_reflection wikiPageWikiLink Ringing_(signal).
- Signal_reflection wikiPageWikiLink Signal_integrity.
- Signal_reflection wikiPageWikiLink Standing_wave.
- Signal_reflection wikiPageWikiLink Standing_wave_ratio.
- Signal_reflection wikiPageWikiLink Standing_waves.
- Signal_reflection wikiPageWikiLink Time-domain_reflectometer.
- Signal_reflection wikiPageWikiLink Time_domain_reflectometer.
- Signal_reflection wikiPageWikiLink Transmitter.
- Signal_reflection wikiPageWikiLink Voltage_standing_wave_ratio.
- Signal_reflection wikiPageWikiLinkText "Echo".
- Signal_reflection wikiPageWikiLinkText "Signal reflection".
- Signal_reflection wikiPageWikiLinkText "reflected waves".
- Signal_reflection wikiPageWikiLinkText "reflected".
- Signal_reflection wikiPageWikiLinkText "reflection".
- Signal_reflection wikiPageWikiLinkText "reflections".
- Signal_reflection wikiPageWikiLinkText "signal reflection".
- Signal_reflection hasPhotoCollection Signal_reflection.
- Signal_reflection wikiPageUsesTemplate Template:Unreferenced.
- Signal_reflection subject Category:Electrical_engineering.
- Signal_reflection subject Category:Electricity.
- Signal_reflection subject Category:Electronic_design.
- Signal_reflection subject Category:Geometrical_optics.
- Signal_reflection subject Category:Physical_optics.
- Signal_reflection subject Category:Radio_electronics.
- Signal_reflection type Article.
- Signal_reflection type Article.
- Signal_reflection type Circuit.
- Signal_reflection type Discipline.
- Signal_reflection 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.".
- Signal_reflection label "Signal reflection".
- Signal_reflection sameAs m.0bqxj.
- Signal_reflection sameAs Эхо_(коммуникации).
- Signal_reflection sameAs Q4533329.
- Signal_reflection sameAs Q4533329.
- Signal_reflection wasDerivedFrom Signal_reflection?oldid=672901803.
- Signal_reflection isPrimaryTopicOf Signal_reflection.