IEEE802.3aq Channel model ad hoc Task 2: Time-varying study

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IEEE802.3aq Channel model ad hocTask 2
Time-varying study modal noise

• Summary of task 2 status following Nov meeting
• 30th Nov 2004
• Jonathan King

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Task 2 status following November meeting

• Task 2 has given input to Channel ad hoc on all
  its study areas
• On Channel time variation mechanisms and speed of
  variation
• Fibre patchcord before main fibre link is main
  source of time variation
• Fibre vibration and quasi static IPR experiments,
  plus referencing GR-63-CORE has shown time
  variation to be characteristically slow, 10Hz or
  less.
• Polarization effect bounded and included in
  measurements above
• Dynamic test removed from draft based on slow
  channel dynamics
• informative comment may be added
• Temperature effects are an insignificant cause of
  channel dynamics
• Modal Noise Calculations
• 0.5dB noise penalty confirmed

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Residual work items - for discussion and agreement

• Complete last two items on temperature effects ?
  - Petre Popescu
• Modal noise calculations were for FP , is DFB
  required ? - Petar Pepeljugoski
• Informative note to be included on channel
  variation for Draft 1.X - is this required for
  January meeting ?
• Others ?

Additional work items - for discussion and
agreement

• Launch study - jointly with task 4 to be
  discussed and agreed
• goals specific input to task force on launch
  conditions and launch testing in time for January
  meeting
• tasks
• simulations showing coverage vs PIE-D plots as
  output, for various launch conditions
• agree common model (connector offsets, rise
  times, per offset statistics)
• recommend (simple) launch compliance test
• volunteers.....