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Team
I collected the feedback given to me on "PD load turn on maintenance request" and modified the suggested solution little bit. Please see below.
Problem Statement:
Suggested Solution Add the following to section 33.3.7.3 "PDs shall not draw more than the maximum current allowed by a PSE during inrush as outlined in section 33.2.7.5" Change 2nd paragraph of section 33.3.7.1 as follows (change shown with underline) "The PD shall turn on at a voltage greater than Voff and less than or equal to Von" Thanks
Kousi
From: Koussalya Balasubramanian (kobalasu) [mailto:kobalasu@xxxxxxxxx]
Team In Jan interim meeting, Jean and I presented about clarifying PD load turn on behavior that will help in making sure non-compliant
behaviors are avoided. The team directed us to submit this as a maintenance request. Here is what we are planning on submitting – given the maintenance request will come back to 4PPoE group, we would appreciate any comment from 4PPoE group before we submit
it. Problem Statement: - PDs in the field turn on their Load during Inrush. This leads to PD cap not charging up fully (even if C<180uf
and PSE is following inrush rules from 33.2.7.5). This may lead to operational problems after inrush. There is a Voff requirement in PD table 33-18 to ensure power supply remains turned off for V<30V, but customers seem to read this as applicable only "after
power on" not during "power on" - hence they turn on their DC-DC during inrush causing problems. Suggested Solution Add the following to section 33.3.7.3 "PDs shall not draw more than the maximum current allowed by a PSE during inrush as outlined
in section 33.2.7.5" Add the following to section 33.3.7.1 at the end of second paragraph. "The turn off voltage Voff applies both during power on and after power on" Thanks Kousi |