Nortel Networks claimt dat de performance van een ADSL touwtje met 40% kan droppen, als gevolg van storing door AM radio frequenties:
The AM radio interference problem varies from place to place, depending on a number of factors, including how close ADSL lines are to AM broadcast antennas and the quality of the inside wiring at customer sites.
BellSouth says customers at the end of very long ADSL lines, where the signal is weak anyway, and who happen to be near an AM radio transmitter, have been unable to get ADSL service at all.
[...] While the AM radio frequencies interfere with ADSL download speeds, they do not affect upload speeds. And AM radio does not affect all types of DSL, only ADSL and its subsets. These include rate adaptive DSL, which has adjustable speeds, and G.lite, which has a maximum download speed of 1.5M bit/sec.
[...] Nortel Networks says it has ways to blunt the effects of AM radio interference. In full-rate ADSL, the company's modems can stop using frequencies where the radio waves cause interference.
Zie Network World voor meer info.