Crosstalk and Noise Levels
As we continue the journey through noise, we’ll end with crosstalk. Crosstalk is usually caused by undesired capacitive, inductive, or conductive coupling from one circuit to another. In cabling, this refers to the superimposing of either pulsed DC or standard AC signals carried on one wire pair to another wire pair in close proximity. Although pair twist tends to reduce crosstalk levels, the most effective means of mitigation is individual cable pair shielding coupled to pair twist.
Once it has been determined that noise currents are going to pose a system problem, it becomes necessary to determine if the noise is of a low, medium or high level. The table below gives general guidelines as to the areas which are subject to these generalized noise levels:
Our next blog entry will discuss shielding options in order to prevent the various noise types previously discussed.