Susceptibility

Written on 6:47 AM by ooe

Antennas work reciprocally. Cables that can radiate emissions can also pick them up from external sources. Normal radio signals do not pose much of a threat to DSL signals because the sophisticated receivers used have intrinsic abilities to eliminate or ignore them. RFI pick-up only really becomes an issue when there are strong nearby transmitters. Again VDSL systems are most likely to be affected because of the increased antenna efficiency of network cables at these frequencies. Some special methods can be used to mitigate these effects, such as RFI cancellation. In very severe RFI environments, such as close proximity to a strong AM broadcast transmitter, DSL systems operating on aerial cabling may not be workable and substitute technology, such as direct fibre, or direct buried cabling carrying DSL may be the only viable alternative.