| Thread Links | Date Links | ||||
|---|---|---|---|---|---|
| Thread Prev | Thread Next | Thread Index | Date Prev | Date Next | Date Index |
|
Hi Fred, Some comments: Slide 4: Icut_max/Icut_min is 0.4/0.3-1=14.28%
and not 7% as stated. Slide 5: I like the simplicity of how PD
is specified in 802.3af then how it presented in slide 5: We should allow
utilizing the full 29.5W as permited by the average current of 0.72A. We can do
it easily by keeping the same concept and margins as in 802.3af. Having 14.28%
margin between Icut_max to Icut_min allows it. It is difficult to understand slide 5. I
disagree with the 1st bullet. We should allow implementations that
uses dc current with ac ripple within the range specified between Icut_max to
Icut_min limited to 50msec max and 5% duty as in 802.3af. Slide 6: The point of having the current
limit at the PD was to solve inrush current due to dv/dt in PSE and dealing
with long TLIM_MIN.
This slide suggests that PD with less then Cpd_max don’t have to implement
current limit. This was exactly the case in 802.3af so what is the purpose of
having all this PD current limit discussion? If Cpd is 179.9UF<180U then Tlim
_min may be still 12.6msec and we are back to square 1 = 3month ago.. The solution is what I thought last
meeting: PD will limit the current within 1msec to ICUT_MAX so we will have to
charge only 0.12uF for the rest of the 50msec max of TCUT. See my presentation
that explains the whole thing. Slide 6: This slide is relevant only if PD
limits to Icut_min. which doesn’t support a solution to utilizing max
29.5W. See my presentation for proposal to solve this issue. In addition, please allocate time to
discuss my presentation that may help to solve some issues that was supposed to
be solved by moving the current limit to the PD and in my opinion are still
requires some discussion. The rest looks fine. Yair From: Hello, IEEE 802.3at, Vport ad hoc team
meetings are scheduled for Tuesday June 26, July 3, and July 10 (9 AM,
PST) to cover current limits required for PoE. Please review the direction we
are heading at: http://grouper.ieee.org/groups/802/3/at/public/may07/schindler_5_28_07.pdf Please also review: http://grouper.ieee.org/groups/802/3/at/public/may07/avetteth_0507.pdf Please
ensure that you review the IEEE-SA PatCom slides [ http://standards.ieee.org/board/pat/pat-slideset.pdf
] prior to the start of the conference call. At the start of call I will ask
that everybody confirms that they have read this material - if anybody hasn't
we will pause the call until they confirm that they have done so. Thanks, Fred ______________________________________________________________________________ Frederick Schindler has invited you to a Cisco Unified
MeetingPlace Conference Date/Time:
JUN 26, 2007 at 9:00AM Length:
60 Frequency:
3 Meeting ID:
131128329 Meeting Password:
Global Access Numbers: http://cisco.com/en/US/about/doing_business/conferencing/index.html US/Canada:
+1.866.432.9903 United
Kingdom: +44.20.8824.0117 TO ATTEND A WEB AND VOICE CONFERENCE: CISCO INTRANET ATTENDEES Join the Web & Voice Conference* 1. Go to http://meetingplaceinternal.cisco.com/join.asp?131128329 2. Enter your CEC User ID & Password then click OK - Accept any security
warnings you receive and wait for the Meeting Room to initialize 3. Click on CONNECT from the Meeting Room to join the
Voice Conference portion of the meeting EXTERNAL ATTENDEES - Outside the Cisco Intranet** Join the Web & Voice Conference* 1. Go to http://meetingplace.cisco.com/join.asp?131128329 2. Fill in the My Name is field then click Attend Meeting - If you have a CEC User ID,
click on the Cisco icon - Accept any security
warnings you receive and wait for the Meeting Room to initialize 3. Click on CONNECT from the Meeting Room to join the
Voice Conference portion of the meeting *If this is your first time
attending a Web Conference, disable any pop-up blockers and visit http://meetingplace.cisco.com/mpweb/scripts/browsertestupper.asp
to test your web browser for compatibility with the Web Conference. **Not all meetings are
scheduled to allow external attendees into the Web Conference portion of the
meeting, if the URL does not work, please follow the Voice only Conference
instructions below to attend. TO ATTEND A VOICE ONLY CONFERENCE 1. Dial into Cisco Unified
MeetingPlace (view the Access Numbers and link above) 2. Press 1 to attend the meeting 3. Follow the prompts to
enter the Meeting ID 131128329 and
join the meeting SUPPORT Information about this Conference:
Contact Frederick Schindler, 14085259859 Cisco IT GLOBAL ACCESS NUMBERS COUNTRY
LOCATION
LOCAL
NUMBER
TOLL
FREE-FREEFONE
West
+1.408.525.6800 1.866.432.9903 Argentina
Buenos Aires +54.11.4341.0101 Brazil
Brasilia
+55.613.424.0220
Regina
+1.306.566.6410
Toronto
+1.416.306.7230
Vancouver +1.604.647.2350
Winnipeg
+1.204.336.6610 Chile
Santiago
+56.2.431.4936 Colombia
Bogota
+57.1.325.6065 Mexico
Mexico City +52.55.5267.1800 Peru
Lima
+51.1.215.5101 Puerto Rico
San Juan
+1.787.620.1865 Venezuela
Caracas
+58.212.902.0210 EMEA
Austria
Vienna
+43.12.4030.6022 Belgium
Diegem
+32.2.704.5072 Bulgaria
Sofia
+359.2.937.5938 Croatia
Zagreb
+385.1.462.8908 Denmark
Aabyhoj
+45.8.939.7131
Copenhagen +45.3.958.5010
Hallbergmoos +49.811.554.3016 Norway
Oslo
+47.23.27.3647 Poland
Warsaw
+48.22.572.2615 Portugal
Lisbon
+351.21.446.8756 Slovakia
Bratislava +421.2.5825.5309 South Africa
Johannesburg +27.11.267.1011
Pretoria
+27.12.844.7401
United Arab Emirates
(UAE)
HongKong
HongKong
+852.3414.1802
Wellington
+64.4.496.5554 Phillipines
Makati (Manila) +63.2.750.5886 Singapore
Singapore Capital +65.6317.7088
Ho Chi Minh City +84.8.823.3418
(Saigon)
Technical Leader CISCO Systems M/S SJ-19-3 Tel. (408) 525-9859 |