What does the term 'crosstalk' refer to in cabling?

Crosstalk refers specifically to the unwanted transfer of signals between communication channels. It occurs when a signal from one channel interferes with the signal of another, resulting in mixed signals that can distort the intended message. This phenomenon is particularly relevant in cabling systems where multiple pairs of wires or channels are running close to each other, allowing for the possibility of electromagnetic interference. Understanding crosstalk is critical in the design and installation of cabling systems to ensure that data transmission remains clear and reliable, making option A the most accurate description.

Other concepts like interference from external sources, signal loss, and distortion are related to different aspects of cabling and data transmission. However, they do not specifically define crosstalk, which is centered on the interactions between adjacent channels rather than external factors or inherent losses in the medium itself.