Re: [core] RSSI in SenML

[Carsten Bormann <[e-mail]>]

> On 22 Mar 2017, at 21:30, Christian Amsüss <[e-mail]> wrote:
> 
> On Wed, Mar 22, 2017 at 07:52:14PM +0100, Carsten Bormann wrote:
>> RSSI is a quantity (an ill defined one).
>> 
>> Table 12.1 is about units.
> 
> By the name, but not by the use. The review guide after the table (esp.
> point 2) indicate that what is called unit in the document is what SI
> calls quantities, and the presence of Hz, 1/s and Bq shows that as well.

Hz, 1/s, Bq are units.

Quantities that can be expressed in these units are, for instance,

frequency, rotational frequency, activity,

respectively.

The principles are in ISO80000-1.  (Most of us got our degrees before 2009; I just wish students today would work more with these fundamentals…)
Look up the units and quantities given above in ISO80000-3 for Hz and 1/s (3-15.1 and 3-15.2 in the quantities table, 3-15.a and 3-15.b in the units table there).
I’m too lazy to look up Bq in ISO80000-10, oh well, it’s 10-29.a in the units table there.

> Maybe that should be clarified in the registry introduction; straw man
> text: "The definitions given here are called units based on common
> language use. In the terminology of the International System of Units,
> they are special unit names, and not only indicate the unit but also the
> described quantity.”

That would most definitely not be true with most entries of the current table.
Almost all are units in the SI or ISQ.
(Yes, there are some entries that are more on the quantity side of the spectrum.)

Grüße, Carsten