[802.3ae_Serial] From serial PMD call: next call tomorrow, Tuesday
1. Standardisation process
There was an inconclusive discussion on the schedule, and ability to make
changes without triggering unexpected recirculations. Clause 52 editor
asked reviewers to pay particular attention to cleaning up the PICS this
time, and thanked Rhett and Eric for their care and time in reviewing the
last draft.
2. Link model
We carefully reviewed recent developments in the link model with the
assistance of participants who were not able to attend the Los Angeles face
to face meeting. There was a desire for stability in the model to assist
the standards process. However, it was pointed out that the values for
modal noise on multimode fibre in the 1300 nm band seemed to be different to
the number used for Gigabit Ethernet. This was probably an oversight and
would not significantly affect the standards process, as it relates to a
parameter for one PMD, not "the model" itself.
There was a discussion of the meaning of Uw, "RMS spectral width". I
dislike this term because, as dictionaries tell us, width is measured "from
side to side" and this quantity, which is the standard deviation, is a
one-side measurement - sort of from middle to side. But people found that
the spreadsheet was adding to their confusion, not reducing it. Since the
meeting I have revised the explanation in the spreadsheet, hopefully being
simultaneously clear, unambiguous and comprehensible this time!
3. Cross channel MPN
Optoelectronic effects
Petar reminded us of a comment he made a while back about the risk of cross
channel MPN that the 10GBASE-LX runs with its "zero-SMSR" way of
specification.
4. For next time
The next PMD teleconference is tomorrow at the usual time. Usual
coordinates:
4:15 pm GMT = 17:15 CET = 11:15 am EST = 8:15 am PST, Tuesday
+1(816)650-0631 Access code 39209
Question of the 10%-90% risetime of the 4th order Bessel-Thomson like
response functions built into modern DCA. Petar would write to the
reflector to set the scene.
Piers