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[802.3_4PPOE] MPS issue due to the allowance for reflected voltage in 3-pair mode

Hi all,


I found new problem that we need to discuss how to handle it.


In 3-pair mode during power on state, when a PD dont want to be powered, it generates e.g. MPS=1.9mA which means PSE must disconnect, but due to the PD that doesnt meet the backfeed on the unpowered pair, the unpowered pair consumes additional 1.3mA and this is added to the MPS. Under these conditions, the PD will not be disconnected.

Moreover, in general, a constant error of additional MPS current is added by the PSE..instead of PD only should control the MPS current.


Lets start to discuss this.




Darshan Yair

Chief R&D Engineer

Analog Mixed Signal Group

Microsemi Corporation


1 Hanagar St., P.O. Box 7220
Neve Ne'eman Industrial Zone
Hod Hasharon 45421, Israel
Tel:  +972-9-775-5100, EXT 210.

Cell: +972-54-4893019
Fax: +972-9-775-5111


E-mail: <mailto:ydarshan@xxxxxxxxxxxxx>.  



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