Question Regarding 09-268 SPL - STP Extended Buffer Support

McGrath, James jmcgrath at email.cinch.com
Mon Nov 2 10:54:15 PST 2009


* From the T10 Reflector (t10 at t10.org), posted by:
* "McGrath, James" <jmcgrath at email.cinch.com>
*
Barry, Cinch has done some work to help answer this question. For
example, in a 3m cable there is less than 0.50nanosec difference in prop
delay from a 24AWG to a 30AWG cable. So length appears to be a practical
parameter to determine prop delay. I can show a few charts, if needed,
at the meeting next week. 
Jim McGrath
Cinch Connectors
1700 Finley Road
Lombard, IL 60148
office: 630-693-2040
mobile: 630-244-3872
-----Original Message-----
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Olawsky,
Barry
Sent: Monday, November 02, 2009 11:30 AM
To: Tim Symons
Cc: t10 at t10.org
Subject: Question Regarding 09-268 SPL - STP Extended Buffer Support
* From the T10 Reflector (t10 at t10.org), posted by:
* "Olawsky, Barry" <Barry.Olawsky at hp.com>
*
Tim (Symons),
During the SFF-8636/8449 conference call on October 22nd a question was
posed for which we need your assistance to answer. Tom Palkert of
Luxtera proposed using cable length to estimate the end-device to
end-device propagation delay. To determine if this is a feasible
technique, we need to know the maximum acceptable total propagation
delay error including resolution and accuracy errors. Since you propose
limits on this parameter in 09-268 we thought you might have valuable
input on this topic.
Barry Olawsky
Hewlett Packard
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