User's Guide Part 1

User Guide: PTP 600 Series PTP 600 general reference information
phn-0896_009v003
Feb 2010
UNDER DEVELOPMENT
4-11
Power density exposure limit
Install the radios for the PTP 600 family of PTP wireless solutions so as to provide and
maintain the minimum separation distances from all persons.
The applicable power density exposure limit from the standards (see Electromagnetic
ene
rgy on page 4-10 ) is:
10 W/m
2
for RF energy in the 2.4-, 5.2-, 5.4-, 5.8- and 5.9 GHz frequency bands.
Calculation of power density
NOTE
The following calculation is based on the ANSI IEEE C95.1-1991 method. as
that provides a worst case analysis. Details of the assessment to
EN50383:2002 can be provided, if required.
Peak power density in the far field of a radio frequency point source is calculated as
follows:
Where: Is:
S power density in W/m
2
P maximum average transmit power
capability of the radio, in W
G total Tx gain as a factor, converted from
dB
d distance from point source, in m
Rearranging terms to solve for distance yields:
2
4
.
d
GP
S
π
=
S
GP
d
.4
.
π
=