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Re: [8023-POEP] IEEE 802.3at Vport ad hoc data input request



Hi Dan,

 

Thanks for helping collect more data.  This will ensure that the constraints created do not interfere with existing devices.

Fred

 


From: Dove, Dan [mailto:dan.dove@xxxxxx]
Sent: Friday, December 01, 2006 9:19 AM
To: Fred Schindler (frs); David_Law@xxxxxxxx; scarlson@xxxxxxxxxxxxx; jetzt@xxxxxxxxx; Yair Darshan; tim_parker@xxxxxxxxxx; youhoa.xi@xxxxxxx; blaine.bowers@xxxxxxx
Cc: STDS-802-3-POEP@xxxxxxxxxxxxxxxxx
Subject: RE: IEEE 802.3at Vport ad hoc data input request

 

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
(916)785-4187 (Office)
(530)389-9315 (home office)
(530)906-3683 (cell)
www.dovenetworking.com

 

------------ 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

170 West Tasman Drive

M/S SJ-19-3

San Jose, CA 95134-1706

Tel. (408) 525-9859

 

 

------------------------  Details ---------------------

 

IEEE 802.3at Vport ad hoc presentations

 

January 2006
Vport static and transient response

http://grouper.ieee.org/groups/802/3/at/public/jan06/schindler_1_0106.pdf

 

May 2006
Vport static and transient response

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
Vport ad hoc dynamic discussion

http://grouper.ieee.org/groups/802/3/at/public/jul06/schindler_1_0706.pdf

 

September 2006
Vport ad hoc discussion

http://grouper.ieee.org/groups/802/3/at/public/sep06/schindler_1_0906.pdf


Vport Static & Dynamic Vport Estimator spreadsheet V10 (XLS format)

 

November 2006
Vport ad hoc discussion

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