[SI-LIST] Re: IEEE1394/Ethernet Routing Guidelines

Dear Student,  (at least this one self declared)
  Is your Dad named Rick?
  The cost of an education is very dear to those of us gray before our time due 
to the effort to find the answers to your question.  However, the information 
is available freely on the internet and other sources, we put it there.   And 
as you have already found, there is conflicting opinions on what counts and how 
to implement it.   As a masters student, I expect one of your requirements is a 
demonstrated ability to use the internal gray matter.  A hint, apply AC 
circuits 101 and Intro to Fields and Waves liberally to the conflicting 
information, mix throughly with gray matter, rinse and repeat.  Companies pay 
large sums of money to consultants and engineers to provide just those answers. 
 
   
  
Randolph Voorhies <voorhies@xxxxxxx> wrote:
  Hi Everyone,
I'm brand new not just to this list, but to the world of PCB production in 
general. I'm currently a masters student at USC in robotics and have been 
producing some relatively simple PCBs for the past few months using Eagle. I'm 
now working on a fairly complex project that involves creating a custom 
baseboard for an XTX module (xtx-standard.org). My formal training is in 
digital electronics, computer architecture, and computer science, so when it 
comes to signal integrity I'm pretty much at a loss. Does anyone know where to 
find specific routing guidlines for differential pair lines such as firewire 
and ethernet? I have read all sorts of conflicting advice (differential 
impedence is crucial vs. differential impedence couldn't matter less, etc..), 
and have had a very difficult time finding exact numbers for trace 
spacing/individual trace impedence and so on. If anyone with experience has any 
advice that has worked for them it would be very very very much appreciated.

Thanks so much,
Rand Voorhies
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