Near-End Crosstalk (NEXT) is a type of signal interference that occurs when a transmitted signal on one wire pair induces unwanted noise onto an adjacent pair at the same end of the cable where the signal originated.

NEXT is most commonly encountered in twisted-pair cabling systems, such as those used in Ethernet networks.

It happens when the electromagnetic field generated by a signal on one pair (the disturbing pair) couples into another pair (the disturbed pair) at the transmitter end.

This interference can corrupt data transmission, especially in high-speed networks like Gigabit Ethernet, where signal integrity is critical.

The severity of NEXT is influenced by factors such as cable quality, twist tightness, termination practices, and signal frequency.

Poorly manufactured cables, excessive untwisting during termination, or improper connector installation can increase susceptibility to NEXT.

Higher-frequency signals are more prone to this type of crosstalk due to their stronger electromagnetic fields and shorter wavelengths.

To quantify NEXT, technicians measure the difference in signal strength between the transmitted signal and the induced noise at the near end.

Standards like TIA-568 define acceptable NEXT thresholds for different cable categories.

Power Sum NEXT (PSNEXT) is a more rigorous metric that accounts for cumulative interference from all adjacent pairs, and is essential for certifying cables for high-speed applications.

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