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Re: [802.3_4PPOE] From which total PD load current , the XXX_P2PRUNB requirements is not required to be met. - Update

Hi Yair,


Regarding ‘the list of facts’ on page 1


I don’t recall a straw poll or a motion showing wide consensus that we have two types of 4P systems of the type you call out.  Can you point me to such a poll or motion if I have missed it?  If not it would be good to establish this in the meeting in Norfolk in the entire Task Force as it seems a bit outside of the scope of this ad-hoc to decide this.


I am aware that there are a considerable amount of components such as magnetics that are designed for 600mA operating in 2 pair systems but aren’t most of these I would guess are cost optimized for operating 600mA in 2 pairs, not 2 X 600mA in 4 pairs.  The main issue here would be heating which is a factor of 2 higher. 


In any case, having available components for any power level is a good thing however, this is an implementation issue and the OEM is free to use any and all components available for their power level and operating temperature range. 


I am again not aware of an objective or motion for this Task Force that states we are going to make a specification based on available ‘at’ components (other than the channel e.g. cable, connectors) that may or may not be available today.





Jeff Heath
Design Center Manager

Description: Linear Technology Corporation




402 East Carrillo Street, Suite D


Santa Barbara, California 93101









From: Darshan, Yair [mailto:YDarshan@xxxxxxxxxxxxx]
Sent: Wednesday, April 30, 2014 3:05 AM
To: STDS-802-3-4PPOE@xxxxxxxxxxxxxxxxx
Subject: [802.3_4PPOE] From which total PD load current , the XXX_P2PRUNB requirements is not required to be met. - Update


Hi all,


Please see updated version of the above.

I did some work to explain some issues raised during our last ad-hoc regarding the question of what is the total PD power that below it we don’t have to meet xxxP2PRUNB requirements.


Please review and let me know if it is clear and it make sense to you.

I would like to discuss the issue on Thursday.






Darshan Yair


Power over HDBaseT Subcommittee

HDBaseT Alliance


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,

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