AW: From serial PMD call 5 June
Hi,
The sinus jitter is stressful that is clear however DJ with undefined
distribution might also be (In many cases when you see double lines in the
eye it will be even worse. We can make optimistic assumptions but there has
to be at least some background other than we do not like stressful
specification.
The question, if you add some sinus jitter on top of the specified DJ and
increase the power or as part of the DJ and measure the penalty for this
case is at the fairly open eye that is required for 10 to -12 of minor
importance (beside the fact that the 0.2 dB accounted for the 0.05 UI is not
clear completely for me also).
My main question aging goes after the RJ . What again is the base for the
0.016 sigma. Can somebody clarify the underlying model. Specifically what is
the assumed for the risetime of the pulses where the slopes convert RIN into
jitter and what is the clock noise assumption or is a tradeoff between the
parameters to be considered in this aspect. In this case this should be made
clear.
Regards Juergen
> ----------
> Von: DAWE,PIERS (A-England,ex1)[SMTP:piers_dawe@xxxxxxxxxxx]
> Gesendet: Freitag, 8. Juni 2001 15:01
> An: '802.3ae Serial'
> Betreff: From serial PMD call 5 June
>
>
> Jitter spec numbers
> -------------------
> Opinion on the call was that:
>
> 0.35 UI of DJ was too much; nearer 0.3 UI would be fairer
> 0.015 UI of sigma_RJ was too little; 0.016 suggested
> The extra 0.05 UI of sinusoidal jitter in the stressed sensitivity test
> was
> a significant burden.
> Some believed that our draft jitter requirements are more demanding than
> SONET.
>
> Anthony Sanders suggested that the stressed eye should contain the
> sinusoidal jitter as a component of the deterministic jitter, rather than
> in
> addition to it. SJ is more stressful than "regular" DJ as its probability
> distribution is concentrated towards the extremes. As these minutes may
> not
> represent the ideas correctly, Anthony would put some slides on the
> reflector for discussion. Also Ali Ghiasi may be able to offer some
> information on CDR requirements (how many UI of eye opening needed).
>
> Next Draft
> ----------
> Is expected 11 June.
>
> Piers
>