It is similar to DSL connection issues cause by spotty telephone wiring. Cross talk and outside interference raise noises levels on the line and the devices on

It is similar to DSL connection issues cause by spotty telephone wiring. Cross talk and outside interference raise noises levels on the line and the devices on either end can't tell the signal from the background noise. This is different from audiophile cabling, which is usually over short distances where noise is not an issue.