From: Richard Wagner (Richard.Wagner@xxxxxxxxxxxx)
Date: Tue Feb 29 2000 - 14:51:34 GMT-3
Title: Phase Shift
If I read that as a test requirement, I would interpret it as "as high
as practically possible". Being aware of the highest data rates
supported by RS-232 and V.35 and setting for those rates would likely
suffice. Since you're running back-to-back, your only risk is
out-of-spec hardware and/or cabling.
These may be "famous last words"... I would not expect a situation
where you would be given substandard equipment and be forced to
determine a slower clock rate while reviewing port statistics for
errors.
If you're worried about it at all, set it to the highest available per
the specification. Then you can run a lot of traffic (big pings)
across it and look at the port statistics.
-----Original Message-----
From: Price, Jamie [mailto:jprice@isgteam.com]
Sent: Tuesday, February 29, 2000 9:21 AM
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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