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Treceiver_settling is defined to be the time between the moment when the optical power at TP7 reaches the conditions specified in 141.7.11 and the
moment after which the electrical signal at TP8[i] remains within 15% of its steady state amplitude, jitter …
Comments:
l
I simplified the wording of the definition of the time.
l
I removed the excess “in the receiver” and “after the PMD” phrases, because we have defined the TP’s – no further clarification is needed.
l
I used the wording “the moment after which” to highlight that we are interested in the time when the signal becomes permanently good. If, for example, the signal actually overshoots, we
want the time after the ringing falls to within the 15%.
l
Why 15%? Was that meant to approximate 2 time constants of decay (that is ~13.5%)? But considering the time constant for a power is somewhat odd. I would suppose that the original writers
had the amplitude in mind. But if they really meant power, then the threshold should be more like 7%. If we want to make this deviation be equivalent to 0.5dB optical power variation, then that would be 12% amplitude.
l
When you say it’s gonna
settle “now”, well when exactly do you mean? See, I’ve already waited too long. And all the
burst is gone.
Frank E.
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