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Fred,
I have requested this information to be gathered and
anticipate a week or so to return it.
Regards,
Dan Dove --------------------- Principal Engineer - LAN PHY Technology Dove Networking Solutions - Serving
ProCurve ------------ Previous Message Below
------------
From: Fred Schindler (frs) [mailto:frs@xxxxxxxxx] Sent: Wednesday, November 29, 2006 12:02 PM To: David_Law@xxxxxxxx; scarlson@xxxxxxxxxxxxx; jetzt@xxxxxxxxx; Dove, Dan; Yair Darshan; tim_parker@xxxxxxxxxx; youhoa.xi@xxxxxxx; blaine.bowers@xxxxxxx Cc: STDS-802-3-POEP@xxxxxxxxxxxxxxxxx; Fred Schindler (frs) Subject: IEEE 802.3at Vport ad hoc data input request Hello, The IEEE 802.3at Vport ad hoc needs
your help collecting data that will help establish new transient constrains on
the MDI. Please forward this email to system designers within your
companies that will help with this effort. If more details are required,
they can contact me directly. We would appreciate getting this data before
the end of December. Thanks, Fred
Schindler Technical
Leader CISCO
Systems M/S
SJ-19-3 Tel. (408)
525-9859 ------------------------ Details
--------------------- IEEE 802.3at Vport ad hoc
presentations January 2006 http://grouper.ieee.org/groups/802/3/at/public/jan06/schindler_1_0106.pdf May 2006 http://grouper.ieee.org/groups/802/3/at/public/may06/schindler_1_0506.pdf Conclusion
of Vport static discussion http://grouper.ieee.org/groups/802/3/at/public/may06/schindler_3_0506.pdf Vport
Static & Dynamic Vport Estimator spreadsheet V9 (XLS
format) July
2006 http://grouper.ieee.org/groups/802/3/at/public/jul06/schindler_1_0706.pdf September 2006 http://grouper.ieee.org/groups/802/3/at/public/sep06/schindler_1_0906.pdf
November
2006 http://grouper.ieee.org/groups/802/3/at/public/nov06/schindler_1_1106.pdf Summary -
The static Vport
voltage is within a 50 to 57 VDC
range. -
Spreadsheet v10 is the
most recent published version (September). See the “PD PSE data” for example data
submissions. -
We are investigating
keeping the PD voltage specification as is when accommodating transient
conditions. -
The channel model used
does not represent a real world system but the task force believes errors are
negligible. -
There are no di/dt PD
constraints in the IEEE 802.3
specification. Goals -
Place a minimum number of constraints on the system in
order to ensure system interoperability. -
We expect to produce a PD di/dt
constraint. -
We expect to produce a PSE voltage droop constraint
(below the static port voltage for a specific
duration). Please send scope images captured and your system setup
details. PD data
required Please use a short cable to connect
the PD to a low output impedance supply for your tests. Operate the PD in
modes you expect higher di/dt rates. We also need data for PD DC-DCs. Load
the output and measure the Ethernet line side to capture the worst-case
data. We expect DC-DC data to provide the most reliable worst-case
data. -
A model number (so that
others can repeat the experiment). Data can be kept anonymous.
Please state your preference. -
di/dt values for a
specific duration. -
Does the PD ever cross
Icut or Ilim? Please provide details if this does
occur. -
How does the PD respond
to MDI voltage changes (up/down within spec.)? ex/ some PDs turnoff when
the supply droops to fast. Some draw more di/dt when the voltage is
increased. PSE data
required Transients are expected for load
changes (assume all PD transition to a new load level), or supply replacement
events (backup of a failing supply). - A model number (so that others
can repeat the experiment). Data can be kept anonymous. Please state
your preference. - dv/dt and
duration. - Details on the condition causing
the transient. Ex/ load change |