Archived from groups: alt.internet.wireless (
More info?)
"AnToNio" <antoniongXXX@zonnet.nl> wrote in message
news:1getx5q.1dm6zsc1bh0rauN%antoniongXXX@zonnet.nl...
> gary <pleasenospam@sbcglobal.net> wrote:
>
> > For North America, the 802.11b/g standards state limits of 1 watt,
>
> I doubt that very much AFAIK the max in the US is also 100 mw!
From IEEE Std 802.11b-1999, clauses 18.4.7.1, 18,4,7,2m and table 115:
"The maximum allowable output power, as measured in accordance with
practices specified by the appropriate regulatory bodies, is shown in Table
115. In the USA, the radiated emissions should also conform with the ANSI
uncontrolled radiation emission standards (IEEE Std C95.1-1999).
Table 115-Transmit power levels
Maximum output power | Geographic location | Compliance document
1000 mW | USA | FCC 15.247
100 mW (EIRP) | Europe | ETS 300-328
10 mW/MHz | Japan | MPT ordinance for Regulating Radio Equip
18.4.7.2 Transmit power level control
Power control shall be provided for transmitted power greater than 100 mW. A
maximum of four power levels
may be provided. As a minimum, a radio capable of transmission greater than
100 mW shall be capable
of switching power back to 100 mW or less."
Most commodity devices are 100 mW (typically a lot less). For one thing, it
permits the same hardware to be sold in North America and Europe. For
another thing, if you put more than 100 mW into a laptop adapter, it gets a
lot harder to comply with the ANSI radiation requirements, which specify
maximum human exposure times for various power densities, as a function of
frequency.
>
> --
> Groeten,
>
> Antonio (Voor email, verwijder X)