AW: From serial PMD call, 13 Feb. Next call at usual #
Hi,
There is one more issue that comes to my mind in relation to yesterdays call
(A question I did not ask).. Those are the penalties that are to be observed
for the different jitter components. If all the path effects (closing the
eye horizontally) that appear in response of the transmitter signal are
covered by the jitter allowance the penalty arising from this has to be
captured there as well. Just to know. There will be a penalty that is
related to the clocking (High frequency noise of transmitter clock) and in
addition some penalty to be visible in response of the path effects. Has it
been discussed how much is foreseen for this?
Regards Juergen
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Von: DAWE,PIERS (A-England,ex1) [SMTP:piers_dawe@xxxxxxxxxxx]
Gesendet: Dienstag, 13. Februar 2001 19:09
An: '802.3ae Serial'
Betreff: From serial PMD call, 13 Feb. Next call at usual #
1. Report from jitter meeting
Mike Dudek gave an unofficial report from last week's jitter meeting
in
Colorado: see the official notes. The people on today's call
thought that
the approach proposed, basically using total jitter at TP3 as the
criterion,
was attractive because more clean and straightforward than some
others.
Two issues were raised:
a. A real receiver in test equipment at TP3 would have its own
noise
which would add jitter. A try-out on the bench to see how much of
an issue
that was, and whether a correction technique would be accurate
enough, would
be very welcome.
b. Is a transversal filter with two equal taps a suitable worst
case or
does its symmetry null out an impairment? Piers to think about
this, other
opinions welcome of course.
2. Jitter
Benny Christensen has some CDR jitter tolerance measurements at 2.5
and
3.125 GBd. This isn't SONET type jitter tolerance but looking for
low error
rate operation with high frequency jitter. He will post these for
discussion next week. Juergen Rahn will also post some slides for
discussion next week.
3. Interferometric Noise
Petar and Peter are working on their position statement. They hope
to post
it in time for a discussion next week.
4. In case anyone has missed it, the next draft standard is
available:
see email from Brad Booth, 9 Feb. Just 10 balloting days to go!!
Next meeting
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Same time at the usual phone number:
4pm GMT = 8am PST Tuesday 20 February 2001 for an hour and a half
-ish
+1(816)650-0631 Access code 39209
Piers