User's Guide Part 1

Chapter 4: Legal and regulatory information Compliance with safety standards
Calculation of power density
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:
=

4
2
Where:
• S is the power density in W/m
2
• P is the average transmit power capability of the radio in W, equal to the configured
maximum transmitter power as a linear number, multiplied by 0.8 to account for the worst
case transmit/receive ratio
• G is the effective antenna gain, including cable losses, expressed as a linear number (not in
dBi)
• d is the distance from the antenna
Rearranging terms to solve for distance yields:
=
�

4
Calculated distances
Table 102 shows calculated minimum separation distances each frequency band and for the
highest gain antenna of each type, assuming that the equipment is operating at the maximum
transmit power for PTP 700. At these and greater separation distances, the power density from
the RF field is below generally accepted limits for the general population.
Calcul des distances pour la conformité aux limites de radiation
radiofréquence
La Table 102 indique les distances minimales de séparation calculées, les distances
recommandées et les marges de sécurité qui en découlent pour chaque bande de fréquence et
chaque antenne. À ces distance et des distance supérieures, la densité de puissance du champ
de radiofréquence est inférieur aux limites généralement admises pour la population.
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