RE: [EFM-Copper] Regarding Comment #99/D1.732
Tom,
I'm a little surprised to hear about confusion regarding the CRC
definition in Clause 61. It uses the same exact language as the
definition of the Ethernet FCS in subclause 3.2.8.
Admittedly, the bit ordering at the alpha/beta interface may be
confusing.
It's explained clearly in Figure H-3/G.993.1 and its associated text
(see
http://www.ieee802.org/3/efm/private/itudocs_1101/G.993.1-2001-Final.pdf
). We do reference this section but we can make that reference more
explicit. Or, ask ITU-T for permission to copy it, if necessary.
Please take a look at this and see if you think it is clear enough.
Examples would be welcome, if someone were to generate them.
--Barry
-----Original Message-----
From: Thomas Dineen [mailto:tdineen@ix.netcom.com]
Sent: Saturday, June 14, 2003 10:14 AM
To: benjamin.brown@ieee.org
Cc: stds-802-3-efm-copper@ieee.org; Thomas Dineen
Subject: Re: [EFM-Copper] Regarding Comment #99/D1.732
Ben:
With the greatest respect and admiration: Lighten up a little!
"You didn't supply the exact wording for the proposed changes to the
draft
and, at this point in the process, comments should provide exact text
remedies."
Yes: But could you envision that one or more people in the audience
who are implementing the Cu PHYs could easily provide these examples
from their test benches??? You are limiting yourself to a very narrow
canyon of thought! Open up a little! Think about new things and new
approaches that could bring value to the project and to your customers!
BTW: I think since we are in still in TF Ballot it is a bit early to
require
exact text remedies!
"P802.3ae didn't supply any test mode frames with the express purpose of
showing the CRC. These were jitter test patterns in the form of ethernet
frames that showed the CRC out of convenience, like was done in 36A."
Yes: But could you see value in trying something new! In each context
the example patterns or frames serve a purpose. In the former case test
patterns, and in the latter case verification or the CRCs.
"P802.3z and P802.3ae used (graciously provided) space on the UNH-IOL
website to assemble test patterns for inter operability simulations.
Many of
these patterns are still available today. I personally think this is the
preferred
approach as UNH is a well accepted forum for inter operability testing."
This is also a good idea, but I still contend the a few example
frames placed
in an informative annex would bring great value, and provides more of a
sure
approach!
Thomas Dineen