Sorry to dig up an old thread but I'm having the same frustration with noisy 48port switches. One switch we've had to just put up with (DGS-1248T rev B), which I'm not happy about. I now need to replace an old 48port switch (located in an IT classroom) and am concerned about replacing it with a noisy switch. Has the situation with the 1248T improved at all?
I tried Andrews (D-Links) email but it bounced so clearly he's moved on since this old thread.