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Re: [802.3_4PPOE] Power price index update

  I would be happy to fill you in on the background for this by phone.
I think would be a lot more time-efficient than email.
  The key for this field is that it is to communicate the relative supply/demand
balance for electricity on the link, as measured by a local price.  This is a
different concept (and have different values) than something like a utility grid
AC power price at the meter (there are application-layer protocols for
communicating these prices over many hops).  So, this is to be only about
the link.
  There should be informative text somewhere to provide guidance on
how it is recommended that the PSE and PD use this field.  I was planning
on writing such text, drawing on considerable material I have on this topic
available on my web page, once I figure out the location, format, suitable
length, etc.

On Tue, Oct 24, 2017 at 11:36 PM, Geoff Thompson <thompson@xxxxxxxx> wrote:

It is our job to provide the field that provides the raw stats from PoE.
Doing any higher level calculation or comparison is out of scope.


On Oct 24, 2017, at 10:58 PMPDT, Lennart Yseboodt <lennartyseboodt@xxxxxxxxx> wrote:

Hi Geoff,

This field has been included in the draft for almost 2 years. I am improving the definition, not adding a new field. 

This was originally proposed by Bruce Nordman of LBNL such that PDs can participate in load shedding schemes. 

Much more definition is indeed needed to determine how PSEs would set the index value and how PDs should react to this. That for sure is out of scope for 802.3, but we have to provide a field in order to be able to convey the data.

Kind regards, 


On 25 Oct 2017 7:53 AM, "Geoff Thompson" <thompson@xxxxxxxx> wrote:

I would assert that this is out of scope for P802.3bt.
It belongs in a higher level management project.

Best regards,


> On Oct 24, 2017, at 7:10 AMPDT, Lennart Yseboodt <lennartyseboodt@xxxxxxxxx> wrote:
> Hello,
> Please find attached an update to the PSE Power price index
> specification. The attached text better specifies how to interpret the
> field and has an optimized mapping between the LLDP field and the
> actual index.
> Kind regards,
> Lennart<yseboodt_01_1117_powerpriceindex.pdf>

Bruce Nordman
Lawrence Berkeley National Laboratory
m: 510-501-7943