[EFM-Copper] Regarding Comment #99/D1.732
Gentle People:
A few days ago I submitted what is today known as Comment #99
the text of which is included in its entirety at the bottom of this page.
I am receiving an increasing number of questions from customers which
indicate a certain amount of confusion about the implementation of CRC
functions and issues of bit ordering in Clause 61.
To assist in clearing up this confusion I am
requesting that an informative annex be added to this
clause which includes one to three compliant example
frames with the associated correct CRC (FCS) value.
These frames will serve as divining rod frames
which an implementor can quickly use to verify the
integrity of his CRC implementation and thus achieve
early inter operability.
As I detailed in the Suggested Remedy I am asking
that one to three example frames be added in an Annex.
Currently I have no plans to propose modifications or
enhancements to the text of the clause.
I would hope that like minded implements would
voluntarily step forward with some example frames.
It has been my experience that inclusion of example
frames in this context greatly enhances early inter
operability or prototype designs, and I believe that
this early inter operability is in the best interest
of the project and EFM Group as a whole.
By the way there is substantial precedent for this
activity from past projects such as 802.3ae where
example test mode frames were provided in multiple
annex.
Thomas Dineen
CommenterName: Thomas Dineen
CommenterEmail: tdineen@ix.netcom.com
CommenterPhone: (408) 956-0539
CommenterCellPhone: (408) 838-3376
CommenterCompany: Dineen Consulting
Clause: 61
Subclause: 61.2.3.3.5
Page: 344
Line: 12
CommentType (E, T or TR): TR
Comment:
I am receiving an increasing number of questions
from customers which indicate a certain amount of
confusion about the implementation of CRC functions
and issues of bit ordering.
To assist in clearing up this confusion I am
requesting that an informative annex be added to this
clause which includes one to three compliant example
frames with the associated correct CRC (FCS) value.
These frames will serve as divining rod frames which
an implementor can quickly use to verify the integrity
of his CRC implementation and thus achieve early
inter operability.
CommentEnd:
SuggestedRemedy:
To assist in clearing up this confusion I am
requesting that an informative annex be added to this
clause which includes one to three compliant example
frames with the associated correct CRC (FCS) value.
The example frames should include the required scrambling
function. Examples should be provided for both the 2BASE-TL
and 10PASS-TS cases.
RemedyEnd: