[SI-LIST] USB 3.0 questions

Hi everyone,

  A few questions about the new USB 3.0 spec.  I just downloaded and started 
reading the spec.

  1) In sections 6.7.3, figure 6-14, the transmitter eye is measured after the 
Reference Cable and Reference Test Channel.  Where are those two things defined?

On a related note:

  2) In Rev 0.5 of the USB 3.0 Electrical Compliance Methodology white paper, 
Section 3 talks about Compliance channels and assert that the Touchstone files 
are available at the usb.org web site (www.usb.org).
      a) Is this the same as the "Reference Test Channel" mentioned in the spec.
      b) Where on the usb.org web site are these files located.  I've looked, 
searched, and googled and do not see them.  (Hopefully I'm looking in the wrong 
place).

Finally,
  3) I'm particularly interested in understanding the breakdown in system 
channel loss between the host(including PCB, internal cables, and front panel 
connector), the Cable itself, and the Device PCB.  Can anyone comment on the 
intent/assumptions of the spec writers?

Thanks,

Eric Kolet Gamble
gamble@xxxxxxxx




      
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