[SI-LIST] Re: why do one need PRBS Rx AND Tx?

You need one on the  Tx side to generate the pattern to transmit.
You need the exact engine on the receive side and load the exact seed to
compare the received pattern to check for errors.

-----Original Message-----
From: Roy Messinger
To: si-list@xxxxxxxxxxxxx
Sent: 6/20/2005 6:46 AM
Subject: [SI-LIST] why do one need PRBS Rx AND Tx?

Hi,
I'm looking at some data sheet of a cross point switch (of Mindspeed)
which 
i need for something i'm working on and there's a fucntion called PRBS 
Tx/Rx. Now, I'm a newbie in this busyness, so I've tried to look at the
net, 
finding some material about this PRBS. I did find an exact definition at
*
www.wikipedia.com* <http://gmail.google.com/gmail/www.wikipedia.com> and
at 
this link
*http://www.freelists.org/archives/si-list/03-2004/msg00289.html*<http:/
/www.freelists.org/archives/si-list/03-2004/msg00289.html>
But my component has 2 PRBS built inside. One for Rx and one for Tx. I
don't 
understand why I need 2 components. The goal is to check the crosspoint
and 
so we need a PRBS to make a random pattern of signals, which get inside
the 
cross point switch to check its functionality (am i right here?). But
why 
should I need receive PRBS and transmit? 
any ideas?
Thanks!
Roy

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