I am designing a carrier board with 16 POE PSE channels in addition with 4*4 ports marvell 88E1548 phy. For the moment, i don't know if the distant devices will draw more than 12.95W so i considered the LTC4266 POE+ PSE as a start.
I have read some of the specifications about POE, but i still don't get some of the features.
Let's assume that i want to give a certain margin to my PD device and i use a class 4 PD (LT4275B) . My questions are :
- during the classification stage, does the PSE detects the signature of the PD by sending 25.5W to the device? (if yes, i will need a 400W or more power supply :/ )
- if my device is not drawing more than 10W (during normal processing), will it still work efficiently?
Sorry for the silly questions, i'm not familiar with POE.
Thank you in advance.