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Posted by Richard Crowley on 01/26/06 17:13
"Rick S." wrote ...
> The reason Roger can't find USB cables with ferrite chokes
> is because they aren't needed. With most kinds of serial
> communication you'd have to have an insane amount of
> interference to cause a problem. A USB cable is just two
> data lines and two grounds.
I have sitting right here next to my keyboard one USB cable
with molded-in ferrite chokes on each end, and two more which
came from the manufacturer with the "snap-on" kind on each end.
If anything, serial forms of communication (like USB and Firewire
and SATA) create MORE potential for interference as their
data/clock rates are 8~16x what they would be if they were
parallel connections. OTOH, they are all shielded, also.
I believe Roger's question wasn't about the *general*
availability of USB cables with ferrite chokes, but rather the
availability of *premium* (magical, snake-oil, boutique, name-
brand) USB cables with ferrite chokes. You can tell from my
obvious prejudice that I have no faith in premium cables and
I would not pay a penny extra for them.
I must admit that I have removed the snap-on ferrite chokes
from most of the cables I use, and with no discernable down-
side. Now if I were having an RFI problem, that would be
one thing, but getting government regulatory approval is a
hoop that manufacturers must jump through whether they
actually make any sense in the real-world or not.
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