RE: USB 3.0 A-to-A

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On Tue, 10 Apr 2012, Brink, Peter wrote:

> It's not that you cannot do it, you just have to have a blob or
> dongle in the middle that is going to do the client work for both
> sides.  It's a little more complicated solution, since you have to
> have an object that can communicate with two hosts.  I have not
> researched A-to-A cables, but I know that they exist and have been
> used for that purpose.  The warnings on the following link apply:

This is not entirely correct.

Section 5.5.2 of the USB-3.0 specification (USB 3.0 Standard-A to USB 
3.0 Standard-A Cable Assembly) says:

	The USB-3.0 Standard-A to USB-3.0 Standard-A cable assembly is
	defined for operating system debugging and other host-to-host
	connection applications.

Table 5-10 then defines the appropriate pin connections, in which the 
TX pair on each end is wired directly to the RX pair on the other end.
There does not need to be any "blob" or dongle in the middle of the
cable.  Some host controllers have the capability to communicate 
directly with each other.

Alan Stern

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