piclist 2008\07\11\095512a >
Thread: USB power in parallel
face picon face BY : email (remove spam text)(Olin Lathrop)

William Couture wrote:
> Out of sheer curiosity, can anyone explain why a USB extension cable
> is "illegal" under the USB specifications?

This is explained in the standard.  The guaranteed voltage levels and edge
transition times are calculated for the max length cable.  Someone could
make a longer overall cable if A-A cables were available.

Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
(978) 742-9014.  Gold level PIC consultants since 2000.
<003901c8e35e$0ac51be0$0300a8c0@main> 7bit

See also: www.piclist.com/techref/power.htm?key=power
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