Near end crosstalk

Near end crosstalk

:"For the MTV dating show, see Next (TV series). For the computer platform, see NeXT"Near End Crosstalk (NEXT) is an electromagnetic interference (EMI), also known as crosstalk, introduced on UTP by close by wires, usually running in parallel with the NEXT induced wire.

"Near End" refers to the inductance of EMI in the end "closer" to the end being measured on the alternate wire in a pair.

In opposition to this, FEXT (Far End Cross Talk) is the detection of EMI on a wire whose inductance is at the far end from the measurement point. FEXT is weaker at the other end due to attenuation of the crosstalk signal.

Crosstalk is generally computed as the ratio in voltage between a "test signal" and the induced crosstalk signal in an alternate wire.

Professional computer network cabling must pass TIA/EIA (Telecommunications Industry Association/Electronic Industries Association) standards tests, generally TIA/EIA-568-B standard.

See also

* Unger model

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Look at other dictionaries:

  • near-end crosstalk —    Abbreviated NEXT. Any interference that occurs close to a connector at either end of a cable. NEXT is usually measured near the source of the test signal.    See also crosstalk; far end crosstalk …   Dictionary of networking

  • far-end crosstalk —    Abbreviated FEXT. Interference that occurs when signals on one twisted pair are coupled with another pair as they arrive at the far end of a multipair cable system. FEXT becomes a problem on short loops supporting high bandwidth services such… …   Dictionary of networking

  • Far end crosstalk — (FEXT) is an electromagnetic interference (EMI), a type of crosstalk, introduced on UTP by close by wires, usually running in parallel with the FEXT induced wire. Far End refers to the inductancehuh of EMI in the end further from the end being… …   Wikipedia

  • Crosstalk (electronics) — For other uses, see Crosstalk (disambiguation). Not to be confused with Spill (audio). In electronics, crosstalk (XT) is any phenomenon by which a signal transmitted on one circuit or channel of a transmission system creates an undesired effect… …   Wikipedia

  • crosstalk —    In communications, any interference from a physically adjacent channel that corrupts the signal and causes transmission errors.    See also far end crosstalk; near end crosstalk …   Dictionary of networking

  • Attenuation to crosstalk ratio — In telecommunications, the attenuation to crosstalk ratio is the ratio of the attenuated signal to near end crosstalk (NEXT). It s a factor in determining how far a signal can be transmitted in any given medium …   Wikipedia

  • Attenuation To Crosstalk Ratio — Der Attenuation To Crosstalk Ratio (kurz ACR; deutsch Dämpfung Nebensprech Verhältnis) ist das Verhältnis von NEXT (Near End Crosstalk) und Kabeldämpfung in dB (ACR = NEXT (dB) Kabeldämpfung (dB)). Der ACR Wert drückt die Qualität eines Kabels… …   Deutsch Wikipedia

  • Attenuation to crosstalk ratio — En telecommunications, le rapport d atténuation de diaphonie est le rapport d un signal atténué et du NEXT (diaphonie near end ou Near End Cross Talk). Il s agit d un facteur déterminant à quelle distance un signal peut être transmis dans tous… …   Wikipédia en Français

  • Copper cable certification — 10G Certification Kit In copper twisted pair wire networks, copper cable certification is achieved through a thorough series of tests in accordance with Telecommunications Industry Association (TIA) or International Organization for… …   Wikipedia

  • ГОСТ Р 54429-2011: Кабели связи симметричные для цифровых систем передачи. Общие технические условия — Терминология ГОСТ Р 54429 2011: Кабели связи симметричные для цифровых систем передачи. Общие технические условия оригинал документа: 3.23 волновое сопротивление (characteristic impedance); Zc: Среднее геометрическое значение модулей входных… …   Словарь-справочник терминов нормативно-технической документации

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