Crosstalk is interference from capacitive and inductive coupling between adjacent conductors, cable pairs or circuit traces. Near-end crosstalk (NEXT) is measured at the same end as the disturbing source and far-end crosstalk (FEXT) at the opposite end. It grows with parallel run length, tighter spacing and faster edge rates, and is controlled by twisting, shielding, separation and solid reference planes.
NEXT fail on pair 3-6, the installer untwisted two inches at the jack and the crosstalk went off the scale.
Also heard as
- XT
- cross-talk
Related terms
EMI
Electromagnetic interference: unwanted electrical noise that disturbs the operation of a circuit or system.
Common-mode
Describes signals or noise present equally, in the same phase, on both conductors of a pair relative to ground.
Impedance
Total opposition a circuit offers to alternating current, combining resistance and reactance, in ohms.