O'Reilly logo

Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Overall Timing Constraints
The first timing constraint we need to keep in mind is that we always need to limit the detection time tDET to less than 0.5 s. To confirm compliance, tDET should be measured starting from the moment the PI voltage first climbs above 2.8 V to initiate detection, till the voltage either falls below 2.8 V (again) or goes above 10 V, whichever occurs first. See Figs. 4.3, 4.4, 4.5, and 4.7.
Some terms to keep in mind here first: as per the standard, after a successful classification, the PD enters the MDI power states, in which it finds power being released to it and accordingly introduces certain delays before activating the DC-DC converter (as explained in the next chapter). From the PSE’s perspective, there are two ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required