[10GBASE-CX4] RE: [802.3] 10GBASE-CX4 Notice to IEEE 802.3
After discussions with several people and further study, I would like to withdraw my comment at this time in order to give additional consideration to alternate implementation options. I appreciate the time and attention of the 10GBASE-CX4 Study Group.
-ahmet
-----Original Message-----
From: Ahmet Tuncay
Sent: Monday, March 10, 2003 7:39 PM
To: 'DOVE,DANIEL J (HP-Roseville,ex1)'; 802. 3 Working Group (E-mail);
10GBASE-CX4 (E-mail)
Subject: RE: [802.3] 10GBASE-CX4 Notice to IEEE 802.3
Dan, congratulations on the progress you're making. I did not make it to the plenary at DFW but had a request for the initial draft of the CX4 PMD that would be helpful to the 10GBASE-T folks later on.
This relates to the proposed changes to Clause 45 for adding new copper PMD types. I see that you're suggesting changes to add the CX4 PMA/PMD but not in a way that would be very simple to add other PMDs since you're using the reserved bit 1.8.9 in Table 45-1 to indicate CX4 ability.
As a suggestion, would you consider the following:
1. Leave the same your suggested modification of paragraph 45.2.1.6.1. This uses the reserved bit in PMA/PMD type selection control register, effectively doubling the possible PMA/PMD types. BTW, I think your draft is missing the encoding of this register.
2. Change the use of the reserved bit 1.8.9 to indicate fiber and copper PMD ability. Something like 1=PMD has the ability to operate over copper media; 0=PMD has the ability to operate over fiber media should work.
3. Pick one of the reserved registers like 1.11 to indicate copper PMA/PMD capability, something like the below should work:
1.11.15 CX4 ability
1.11.14 10GBASE-T ability
1.11.13:0 Reserved.
Anyhow, I'm sure other folks will have useful comments about this, good luck with the par this week,
-ahmet
_______________________________
Ahmet Tuncay
SolarFlare Communications, Inc.
9501 Jeronimo Road, Suite 100
Irvine, CA 92618
Direct: 949-581-6830 x2100
Mobile: 949-290-1898
tuncay@solarflare.com
www.solarflare.com
_______________________________
-----Original Message-----
From: DOVE,DANIEL J (HP-Roseville,ex1) [mailto:dan.dove@hp.com]
Sent: Wednesday, February 26, 2003 11:17 AM
To: 802. 3 Working Group (E-mail); 10GBASE-CX4 (E-mail)
Subject: [802.3] 10GBASE-CX4 Notice to IEEE 802.3
Dear Colleagues,
The 10GBASE-CX4 Study Group has been extremely busy over the last 4 months.
Since our CFI and the authorization of our study group, we have had three
meetings and numerous teleconferences. As we described in our schedule last
November, we have developed a PAR, 5 Criteria, Objectives and a working
paper so that we can get a specification developed in record time.
There has been a huge amount of consensus within the group on our direction
and the working paper we have developed. Most votes have been unanimous as
can be seen by reviewing our meeting content on the web.
Per our schedule, we have now a complete working paper. This document has
been reviewed by the Study Group, improved, and detailed to meet our
objective of bringing it before the 802.3 Working Group for ballot if our
PAR is approved. If our PAR is approved and our working paper is allowed to
become a draft that goes out to ballot, we will have the opportunity to
perform two re-circulation ballots prior to the July Plenary.
We were required to bring this document to 802.3 at least one week before
the Plenary, but we are bringing it forward today, ahead of schedule, so
that you may have more time to review and provide feedback to our reflector
at mailto:stds-802-3-10GBCX4@ieee.org. We intend to continue our review
process, and if any changes are required prior to sending it out to ballot,
we will walk through those changes at the closing 802.3 plenary on Thursday.
I realize that this is a very aggressive goal we are trying to attain, but I
also have been extremely impressed by the volunteerism, dedication, and
detail that our team has applied to the problem. I hope that your review of
this document confirms my impression.
Please jump over to our website at
http://www.ieee802.org/3/10GBCX4/index.html to see our progress and the
working paper.
Best Regards,
Dan Dove
Chair, 10GBASE-CX4 Study Group
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Principal Engineer, LAN PHY Technology
System Architect, Workgroup Switching
dan.dove@hp.com
hp ProCurve Networking Business
8000 Foothills Blvd. MS 5555
Roseville, CA 95747-5555
Phone: 916 785 4187
Fax : 916 785 1815
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