[10GBT] Following up on summary from the last meeting
Following up from
where we ended up at the last meeting at Long Beach, here is a list of
reminders:
1) Some of the
proposals listed in the Phy proposal details spreadsheet were incomplete - even
in the items marked "required". I suggest you try to complete them - sooner
rather than later so task force members have time to study them. You can send
the updates to me, or to the reflector and I will incorporate them into the
combined spreadsheet. If you have made changes to the proposal, try to highlight
them so I don't miss transferring the changes to the combined
spreadsheet.
2) There was a
motion a the March meeting in Orlando asking for dynamic power control. There
was a request for details on that in the Long Beach meeting. If there are
details that can be shared via the reflector, please share them or bring a
presentation on the topic to the upcoming meeting in
Orlando.
3) There was a long
discussion at the Long Beach meeting on whether error propagation was going to
create a significant performance hit. If there is additional information that
can be be provided on this topic or simulation code that can be used to
prove/disprove, please provide it.
4) Regarding THP,
there were questions whether reasonable complexity implementations were possible
at the high symbol rates associated with 10GBASE-T. If there is information you
can share to address this issue, please provide it.
5) There was some
debate around the rate of change of temperature of the cabling in data center
and other installations and the impact this could have on the performance of the
system. Is there more information available on this? If the rate of change is
high, it can have implications on the rate of update of adaptive filter
coefficients and also on the rate at which updated THP coefficients have to be
provided by the receiver to the transmitter in case there is dynamic
update.
6) There was request
for balance data on the transformers. I believe this was sent out. If this is
indeed the case, then this issue is closed.
These requests are
not addressed to specific participants. All should feel free to respond if they
have relevant information.
I also invite more
discussion/presentations on the PMD electrical specifications -
a) We did reach
agreement on Transmitter return loss but there was debate on the tolerance of
the impedance used to make the measurement.
b) There were a few
motions on transmit voltage levels but no decision was
reached
c) There has been
very little discussion on transmitter jitter
d) Transmitter
non-linearity has been brought up but there has been limited discussion on the
topic
Regards,
Sanjay Kasturia
Editor-in-chief, 802.3an
cell (650) 704-7686
office (408)
653-2235
fax (408) 844-8187
Teranetics Inc.
2953 Bunker Hill Lane, Suite
204
Santa Clara, CA
95054