Table 31: Calculated Exposure Distances And Power Compliance Margins - Cambium Networks PMP 400 Series Configuration And User's Manual

PMP 400/430 and PTP 200/230 Series Configuration and User Guide

ICNIRP (International Commission on Non-Ionizing Radiation Protection) guidelines for the general
public. See the ICNIRP web site at http://www.icnirp.de/ and Guidelines for Limiting Exposure to
Time-Varying Electric, Magnetic, and Electromagnetic Fields.
The applicable power density exposure limits from the documents referenced above are

10 W/m2 for RF energy in the 4.9, 5.4, and 5.7 GHz frequency bands.
Peak power density in the far field of a radio frequency point source is calculated as follows:
P . G

S

2
4 d
Rearranging terms to solve for distance yields
Table 31 shows calculated minimum separation distances d, recommended distances and resulting power
compliance margins for each frequency band and antenna combination.

Table 31: Calculated Exposure Distances and Power Compliance Margins

Frequency Antenna
Band
5.4 / 5.8 Integrated,
GHz OFDM 10 dBi
Connectori
zed, 17 dBi
4.9 GHz Integrated,
OFDM 10 dBi
Connectori
zed, 17 dBi
The "Recommended Distances" are chosen to give significant compliance margin in all cases. They are also
chosen so that an OFDM module has the same exposure distance as a Canopy module, to simplify
communicating and heeding exposure distances in the field.
pmp-0042 (March 2014)
where
S = power density in W/m
P = RMS 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

d
4
Variable
S
P G
0.079 W 10 10
(19 dBm) (10 dB) W/m
or 1
mW/c
m
0.05 W 50 10
(10 dBm) (17 dB) W/m
or 1
mW/c
m
0.079 W 10 10
(19 dBm) (10 dB) W/m
or 1
mW/c
m
0.063 W 40 10
(18 dBm) (16 dB) W/m
or 1
mW/c
m
2
P . G

. S
Recom-
d
mended
(calcu-
Separation
lated)
Distance
8 cm 20 cm
2
(8 in)
2
6 cm 20 cm
2
(8 in)
2
8 cm 20 cm
2
(8 in)
2
14 cm 20 cm
2
(8 in)
2
Power
Compliance
Margin
6.3
10
6.3
2
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