FYI - European conformance spec for 5 GHz Radio LANs has some slight
modifications which Johannes has pointed out which we have reviewed
today in consideration for our new DFS design. The skinny is that our
implementation of using 3 regions are OK and we will move forward with
that. Below are some small meeting notes on this.
EN 301 893 1.5.1 - new pulse patterns - in effect now (Michael will
confirm) - all rules harmonized, all countries will use the same of
set of pulse patterns. Countries won't be able to pick and choose, all
countries must abide by this.
EN 301 893 1.6.1 - isn't finished yet, it will take effect 6 months to
a year to take effect. 0.8us pulse is what we support today, this spec
pushes the narrower pulse width of 0.5us. Countries won't be able to
pick and choose, all countries must abide by this.
Based on our review today we are OK to keep the US, ETSI, JP
categories for DFS regions. We also do not foresee any future changes
which will break this design. The biggest wild card will be FCC which
is currently reviewing DFS rules but as far as we can tell there is
nothing on the roadmap to allow dynamic configurations for DFS
parameters.
Luis
On Mon, 2011-01-31 at 13:49 -0800, Michael Green wrote:
> Luckily, the "harmonized standard" is by law, one and only one for DFS
> conformance across all European Community countries.
>
> There are no differences in pulse patterns, non occupancy, channel
> close time, etc etc. across EU countries. I have not gotten any
> indication from anywhere that there will be deviation on a country by
> country basis in Europe affecting DFS rules.
>
> BTW, as of June 30, 2010, EN301 893 V1.5.1 became mandatory. All
> devices placed on the EC market must meet those latest pulse patterns
> per V1.5.1.
I realise that. I'm just not convinced we'll have 1.9.1 in 2012.
johannes
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Note: this email is on a public list. If you can't tell that from the Cc
line of the email, I'm not sure you should be working in this field. If
you think I'm mocking you, maybe I am :P
On Mon, 2011-01-31 at 13:33 -0800, Luis R. Rodriguez wrote:
> FYI - European conformance spec for 5 GHz Radio LANs has some slight
> modifications which Johannes has pointed out which we have reviewed
> today in consideration for our new DFS design. The skinny is that our
> implementation of using 3 regions are OK and we will move forward with
> that.
I just fear that will not allow us to keep manoeuvring effectively in
the future, because then we need to change all the implementations,
potentially old ones, rather than just updating the database.
I wasn't so much thinking of the pulse patterns though as the other
timings like the airtime allowed to use before moving onto a new
channel.
johannes