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Hello, An updated ILIM slide is attached. The calculations performed
assume that a PD can draw ICUT for TCUT and that TCUT is longer than or equal
to TLIM. Therefore, a PD could legally draw ICUT constantly even if the
PD voltage is increased. If we do not want to allow this we need to put
the appropriate language in the specification. The PSE can only source ILIM_MIN when enough voltage difference
exists between the PSE and the PD. When a smaller difference exists, less
than ILIM_MIN is sourced by the PSE and the PSE is no longer monitoring TLIM.
The PD voltage ramps to it final value exponentially from this point forward. The values obtained match IEEE 802.3 needs and provide a
shorter TLIM for IEEE 802.3at (because of the higher ILIM and the smaller
voltage change). Please provide comments before the next meeting on Wed. May
9. Thanks for helping this specification move forward, Fred Schindler Technical Leader CISCO Systems M/S SJ-19-3 Tel. (408) 525-9859 PS I would also like to thank Anoop Vetteth for his support on this
effort. |
IEEE 802 3at Task Force Vport I limits v2.pdf