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Hello, The “Transform and Channel” ad hoc is creating a
channel model for the IEEE 802.3 channel (legacy PoE). If you would like
your production transformer characteristics to be included in this analysis
please send the following data to me. Data points or graphs are
acceptable. I require this data be Monday Dec. 10 but may accept late
submissions. If you have a transformer specified for IEEE 802.3at (PoE
plus) please repeat these steps for that part and state whether lab tests were
performed to confirm the data. 1) Identifier: anonymous,
or vendor name and part number 2) Temperature operating range for the specifications
provided. Celsius 3) Maximum resistance from CT to Ethernet connection. ohms 4) Maximum resistance unbalance for CT to Ethernet connection
= Rdiff/(Rmax + Rmin) % 5) The standard deviation for resistance difference (Rdiff =
Rmax – Rmin, on the same transformer). ohms 6) CT current maximum with other stated values in
specification. mA 7) Maximum current unbalance from one Ethernet connection to
the other with other values in specification. This value is twice the
transform bias current limit. mA Thanks for your support of this effort, Fred Schindler Technical Leader CISCO Systems M/S SJ-19-3 Tel. (408) 525-9859 PS The last presentation provided by this ad hoc was: http://grouper.ieee.org/groups/802/3/at/public/nov07/schindler_1_1107.pdf |