From: Scott Morris (swm@xxxxxxxxxx)
Date: Tue Feb 29 2000 - 17:47:07 GMT-3
Title: Phase Shift
Wow.. It's been a long time since I've actually heard anyone ever use
that! Phase shift is a "change in the time or amplitude that a signal
is delayed with respect to a reference signal." (Newton's Telecom
Dictionary)
Typically it has to do with cable types as you point out, where some
cables aren't necessarily equipped to handle certain signals without
lots of errors. Now, unless you have an oscilliscope handy (and know
how to use it), you will most likely NEVER come across the term "phase
shift" in anything having to do with the CCIE lab (grin). If you do,
be afraid, be very afraid....
Scott
swm@emanon.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Price, Jamie
Sent: Tuesday, February 29, 2000 12:21 PM
To: 'ccielab@groupstudy.com'
Subject: Phase Shift
"Choose the highest clock rate available without inducing Phase
Shift or other line errors"
This is a configuration requirement in a test lab that I have. I
have searched for a definition of "Phase Shift" but am at a loss.
If there is someone out there that can explain what it is (or at
least point me to where I can find out) it would be much
appreciated. I would like to find out exactly what Phase Shift is,
what clock rates fall within the spectrum of not inducing this
mysterious occurence, is the Phase Shift/clock rate relationship
dependant on the cable type in use, etc.
In a lab environment I have just been using 56000 or 115200 as a
clock rate - no problems. Come CCIE lab day however, should a line
like this appear in the config then I would don't want to run the
risk of losing even a single point for something as simple as a
required clock rate (even though I dont know what Phase Shift
means) because I set it too high meet the requirement.
Thanks in advance
Jamie
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