piclist 2008\07\11\095512a >
Thread: USB power in parallel
www.piclist.com/techref/power.htm?key=power
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.


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