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changes.mady.by.user Gordon Muir

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Mapping between SyncE jitter period and UI give us:

  • 1G optical: clock rate = 1.25GHz and so one UI = 0.8ns
  • 1G electrical: clock rate = 125MHz and so one UI = 8ns

The 1G optical mask is:

From this mask, we derived an equivalent for 1G electrical as follows:

The 10Hz point must aligns align with the G.8262 10Hz wander tolerance limit, which is 250ns. 250ns equates to 31.25UI. We then simply scaled the higher-frequency breakpoints and max frequency down by a factor of ten (because the clock rate is 1/10 compared to 1G optical). Since UI is already a normalised unit, we retained the 1.5UI requirement at the higher frequencies

This gives us:

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