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[10GMMF] Minutes for TP2 call 6/28/05



Attendance (no order)
  • Jim McVey
  • Lew Aronson
  • Andre van Schyndel
  • Paul Wachtel
  • John Dallesassee
  • John Jaeger
  • David Cunningham
  • Paul Kolesar
  • Ryan Latchman
  • Jonathan King
  • Ernie Bergmann
  • Gaurov Maholtra
  • Tom Lindsay
  • Piers Dawe
  • Mike Dudek
  • Petar Pepeljugoski
  • Vivek Telang
  • Majid Barazande-Pour
 
Agenda
  • Attendance (done, see above)
  • Build agenda (done)
  • Review previous minutes (done, no comments)
  • Technical discussions (see below)
  • Next call (see below)
 
Discussion (TWDP)
  • Brief review of decisions required, discussed last week. See slide 3 of http://grouper.ieee.org/groups/802/3/aq/public/upload/TWDPworkafterLondon.pdf.
  • In response to action from previous week, presentation uploaded to compare metrics of SNR, TWDP, and implementation penalty (IP) with finite length EQ. See http://grouper.ieee.org/groups/802/3/aq/public/upload/AnalysisofSNR_TWDPandfinitelengthIPvs.measuredwaveforms.pdf.
  • Discussions
    • Use of finite length to represent Rx IP is not meant to be exhaustive; additional impairment options are suggested in the last slide for follow-on work.
    • On slide 3, typo, the lower left waveform should be 1207-06.
    • Are all the Intel waveforms filtered? It appears that some are not. (I sent Jan an email asking about this).
    • On slides 5 & 6, several waveforms are not displayed on slide 3. Some of the missing can be found through links in http://grouper.ieee.org/groups/802/3/aq/private/examples/waves050330/MeasuredTP2waveforminfo.xls. Other waveforms from the S041106- series can be found in http://grouper.ieee.org/groups/802/3/aq/public/nov04/lindsay_2_1104.pdf, although some of these may lead to penalties too high to support 300 meters.
    • Slides 5 and 6 - is 0 dB IP for post cursor with the Gaussian waveform correct?
    • Small differences in IP across the range of waveforms is surprising. Does this reduce the interest in using a finite length EQ?
      • No, want to increase sensitivity against reflections with long delays and to pre-cursor response, appropriate for practical EQs.
    • The anti-aliasing filter in TWDP may be slightly pessimistic by increasing IP with finite EQ.
    • Per slides 10-12, OMSD normalization appears better for relating the effects of pre-emphasis, but this needs to be studied more to determine if true across the board.
    • Why are some of the best measured waveforms not better than the synthesized Gaussian waveform?
      • Hard to do better than some of the measured eyes with reasonable yields; standard must set appropriate limits to support yield and link closure.
      • Are the comparisons real, due to mismatched rise/fall, ringing, jitter, etc., or an artifact of acquisition (scope timebase), or ??
      • OMSD normalization shows this more than OMA normalization. Request made to try other speeds of Gaussian waveform.
      • Real waveforms effects can be part of the IP budget.
    • Everyone is encouraged to review the data and follow up with questions and/or conclusions.
  • Next week
    • Tom will be on vacation, will get another to run the call.
    • Vivek planning to present on correlation across EQ lengths (action from 6/23).
    • Requests for new sims
      • ~0/30/60 psec Gaussian with pre/post, long/short EQs, normalized with OMSD/OMA. Show SNR, TWDP, and IP.
      • Other IP mechanisms.
 
Next call
  • Date: Tuesday, 5 July, 2005
  • Time: 9:00 AM Pacific
  • Duration: 1:30 max
  • Number: 401-694-1515
  • Access code: 421721#
 
Thanks,
Tom Lindsay
ClariPhy Communications
tom.lindsay@clariphy.com
phone: (425) 608-0209 or (949) 480-9210
cell: (206) 790-3240
fax: (425) 608-0232
 
----- Original Message -----
Sent: Tuesday, June 28, 2005 8:01 AM
Subject: [10GMMF] Reminder for TP2 call 6/28/05

  • Date: Tuesday, June 28, 2005 (TP3 will not be holding a call next week, and several on the call stated a preference for Tuesday).
  • Time: 9:00 AM Pacific
  • Duration: 1:30 max
  • Number: 401-694-1515
  • Access code: 421721#
Tom