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[10GMMF] Minutes for TP2 call 3/24/05

Attendance (no order)
  • John Ewen
  • Ernie Bergmann
  • Mike Dudek
  • Greg Lecheminant
  • Piers Dawe
  • Joe Gwinn
  • David Cunningham
  • Vivek Telang
  • Lew Aronson
  • Tom Lindsay
  • Jan Peeters Weem
  • John Jaeger
  • Matt Traverso
  • Approved as proposed
  • Uploading waveforms
    • All waveforms should be
      • (re)sampled to 16 samples per UI average.
      • exactly one pattern repetition long; for example, a prbs 2^9-1 waveform would include 16*511 samples.
      • time-aligned to the binary sequence as given on the web; for example, start with a run of 9 ones for 2^9-1.
        • exact alignment is not critical, but should be within a fraction a bit.
      • Waveforms should be in actual optical power units as from TP2.
      • OMA and SteadyStateZero values must be included.
    • This will promote common format and simplify usage.
  • Simulation results
    • See
    • Vivek will try to reproduce results (I have since sent a few pre-processed waveforms to Vivek)
    • Preliminary observations
      • Measured waveforms, although having lower penalties than the Gaussian waveform for very long equalizers, often show higher penalties for shorter EQs.
      • The increases are fairly small (a few tenths of a dB), but then most of the waveforms analyzed are "good" eyes; we need more results from a wider range of waveform characteristics.
      • 2 pre-emphasized eyes showed reduced penalties (relative to Gaussian) in almost all EQ configurations.
      • Penalties are not always monotonic with EQ length (an explanation has been subsequently sent to the reflector).
      • The Gaussian waveform settles with 3 or more feedback taps; in several cases, measured waveforms benefit from more than 3 FB taps.
    • Future work
      • More waveforms (see above).
      • Try new IPRs, at least pre-cursor, developed for matching coverage across range of EQs
      • Replot penalties vs. PIE-D value for each IPR.
      • Other suggestions and analyses encouraged.
      • Eventually - assess impact, if any, to budget, TP3 stresses, TP2 limits.
  • Other WG priorities and tasks
    • Back reflection method and spec
      • Mike and Piers to complete proposal.
      • Leaning towards using MMF and -12 dB spec, but details still need work.
      • Hope to review in a couple of weeks.
    • AC coupling for RIN
      • Tom agreed to work this. I will try to float a completed comment in 1-2 meetings.
      • AC coupling should be straightforward with frequency spectrum method (elevated to primary status in Atlanta); due to DC coupling, scope method users may overestimate value.
      • Plan is to use 1 MHz.
    • Jitter waveform (measurement example)
      • No real action required. Tom created waveform for D1.1, but after deadline, so change not accepted.
      • I will send to group for review.
    • Jitter magnitude
      • No current motion to change spec or method.
    • TWDP editorial changes
      • Comment 96 (Tom) has most of editorial changes required - submit next time.
      • Suggestion to break up comments - accepted.
    • TWDP technical
      • Focus - track work above with measured waveforms, pre-emphasis, etc.
      • OMA definition - related to previous line. In current TWDP approach, OMA has 1:1 effect on penalty results.
    • Test patters
      • Tom needs to write up what is required - action for next call.
      • This task does not relate to prbs9 patterns, but to in-service testing.
    • Eye mask
      • Suggestion to eliminate mask, but any changes to the mask should follow TWDP and measured waveforms work.
      • Would like to eliminate "beauty contest", but if LRM does not provide a mask, then customer will create his own which could be a worse situation.
      • Need peak power limit to protect Rx overload? (carryover topic, still need inputs).
Next call
  • Date: Thurs, Mar 31, 05 (regular day/time)
  • Time: 9:00 AM Pacific
  • Duration: 1:30 max
  • Number: 401-694-1515
  • Access code: 421721#
    Tom Lindsay
    ClariPhy Communications
    phone: (425) 608-0209 or (949) 480-9210
    cell: (206) 790-3240
    fax: (425) 608-0232
    ----- Original Message -----
    Sent: Wednesday, March 23, 2005 12:40 PM
    Subject: Re: [10GMMF] TP2 call 3/24/05

    All - here is a proposed agenda for tomorrow's call.
    • Attendance
    • Set agenda
    • Discussions
      1. Preliminary simulation results of measured waveform penalties vs. EQ lengths for three D1.1 TP3 channels
      2. Format for uploaded measured waveforms (see below)
      3. Prioritize, assign WG task list (see below)
      4. Other proposed topics?
    • Next call
    Measured waveforms - before uploading, can each waveform be pre-processed, where pre-processing includes resampling to #nn samples per UI, truncated, and time-aligned?  If so,
    • Can suppliers of waveforms they take responsibility for their pre-processing?
    • Set #nn = 16.
    • Can the waveform be aligned to the pattern or vice versa?
    • Noise
      • 95 (back reflection spec or method/setup)
      • 98 (AC coupling?)
    • Jitter
      • 108 (jitter waveform figure)
      • 147 (uncorrelated jitter magnitude)
    • TWDP
      • 96 (editorial updates to code)
      • 146 (channels, EQ lengths, limits)
        • consideration of real Txs
        • work with TP3
    • 83 (OMA definitions critical)
    • Test patterns (no comment #)
    • Mask
      • 145 (role of PE waveforms and impact to mask)
      • 64 (low cutoff frequency for mask test)
    • Others?
    ----- Original Message -----
    Sent: Wednesday, March 23, 2005 8:43 AM
    Subject: [10GMMF] TP2 call 3/24/05

    A TP2 con-call will be held during our regular time March 24. I hope to put out an agenda later today, but for now, please review
    Call details:
  • Date: Thurs, Mar 24, 05 (regular day/time)
  • Time: 9:00 AM Pacific
  • Duration: 1:30 max
  • Number: 401-694-1515
  • Access code: 421721#
    Tom Lindsay
    ClariPhy Communications
    phone: (425) 608-0209 or (949) 480-9210
    cell: (206) 790-3240
    fax: (425) 608-0232