crosstalk

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Related to alien crosstalk: Near end crosstalk

crosstalk

[′krȯs‚tȯk]
(communications)
The sound heard in a receiver along with a desired program because of cross modulation or other undesired coupling to another communication channel; it is also observed between adjacent pairs in a telephone cable.
Interaction of audio and video signals in a television system, causing video modulation of the audio carrier or audio modulation of the video signal at some point.
Interaction of the chrominance and luminance signals in a color television receiver.
(engineering acoustics)

crosstalk

Undesired signals in one electrical circuit as a result of electrical coupling with another circuit.

crosstalk

(electronics)
Interference caused by two signals becoming partially superimposed on each other due to electromagnetic (inductive) or electrostatic (capacitive) coupling between the conductors carrying the signals. A common example of crosstalk is where the magnetic field from changing current flow in one wire induces current in another wire running parallel to the other, as in a transformer. Crosstalk can be reduced by using shielded cables and increasing the distance between conductors.

crosstalk

(1) Electromagnetic interference that comes from an adjacent wire. "Alien" crosstalk is interference that comes from a wire in an adjacent cable, for example, when two or more twisted wire pair cables are bundled together.

(2) (Crosstalk) An earlier family of communications programs for DOS and Windows from Attachmate Corporation, Seattle, WA (www.attachmate.com). Crosstalk products were originally developed by Microstuf, Inc., later merged with DCA and then Attachmate. It was one of the first personal computer communications programs, originating in the CP/M days. Crosstalk used the Crosstalk Application Script Language (CASL).
References in periodicals archive ?
CARACTERISTICAS: Cumple ANSI/TIA-568-C.2, ISO/IEC 11801:2002 Clase EA hasta 650 MHz; blindaje disponible para mas aislamiento de senal; resistente al alien crosstalk, opcion de cruceta eliptica; materiales libres de plomo, con tecnologia AirES de mejora el flujo de datos y ahorra espacio, cumple y excede requerimientos IEEE802.3an para 10 Gigabit Ethernet.
"The innovative design of the new CopperTen Patch Panel essentially eliminates the problems associated with alien crosstalk that normally disrupt transmission of high-frequency data communications, such as those needed for 10-gigabit Ethernet," said Bob Kenny, vice president of Global Enterprise Product Management for ADC.
Since the advanced signal processing in 10GBASE-T manages to mitigate the sources of noise and distortion within an individual four-pair cable sheath, this ultimately leaves the system limited in performance by external crosstalk from other cables in close proximity, called alien crosstalk. Alien crosstalk can come either from sources at the same end of a transmitting link (alien NEXT), or from sources transmitting at the other end, or somewhere along the length of the link (alien FEXT).
If the cabling has a measured DB margin, then you can assume alien crosstalk is met by design.
A superior channel headroom on NEXT (3dB), Return Loss (3dB) and Alien Crosstalk (15dB) is guaranteed.<p>Copyright 2009 IDG Middle East.
Utilizing Category 7a stranded cable, the patch cord meets/exceeds all 10GBASE-T standard requirements, including all alien crosstalk parameters.
For example, UTP cables rely upon the physical separation of pairs in adjacent cables provided by flexible dielectric materials to control alien crosstalk, which can make them susceptible to alien cross talk degradation over the life of the system.
Designed for copper wiring environments where frequent patching and a high density is required, the UniPatch GigE patch panel features a high-density card frame system, a modular design and offset jack positioning to counter the effects of alien crosstalk. Key features include: Category 5e channel compliance; Category 6-compliant patch keyed to ensure proper patching; 32 circuits per panel, rated for 30,000 insertions and/or withdrawals; normal-through or straight-through availability; and test access, patch, crossconnect and monitor functions in 100 ohm-balanced transmission systems having a common signal format, bit rate and operation up to 1,000 Mbps per second.--ADC
Shielded Cabling The primary reason shielded cabling is best for 10GBASE-T is that, although the chipset for 10GBASE-T is very advanced in terms of its ability to cancel out and accommodate internal noise from the twisted pair cable, one major limitation is its tolerance to external noise, the uncorrelated noise from other cables, known as alien crosstalk. "In addition to providing superior alien crosstalk performance, the shield provides general immunity to external noise for 10GBASE-T networks," states Siemon.
Recabling costs and troubleshooting expenses are also negated, since fiber-optic transmission is immune to electronic interference and radio frequency interference issues, such as alien crosstalk.
CopperTen's design minimizes alien crosstalk and insertion loss, and meets the performance requirements of the recently ratified IEEE 802.3an 10GBASE-T standard, as well as the current TIA 568-B.2-10 draft standard.
Maximizing pair-to-pair separation between adjacent outlets minimizes alien crosstalk even in the most dense category 6A patching environments.