Cambium PTP 450 series, User Manual

Page: 141 / 180

PMP 450 Configuration and User Guide Glossary
ptp-450 (July 2014)
4-121

US FCC limits for the general population. See the FCC web site at http://www.fcc.gov , and the
policies, guidelines, and requirements in Part 1 of Title 47 of the Code of Federal Regulations, as well
as the guidelines and suggestions for evaluating compliance in FCC OET Bulletin 65.

Health Canada limits for the general population. See the Health Canada web site at http://www.hc-
sc.gc.ca/ewh-semt/pubs/radiation/99ehd-dhm237/limits-limites_e.html and Safety Code 6.

EN 50383:2002 Basic standard for the calculation and measurement of electromagnetic field strength
and SAR related to human exposure from radio base stations and fixed terminal stations for wireless
telecommunication systems (110 MHz - 40 GHz).

BS EN 50385:2002 Product standard to demonstrate the compliances of radio base stations and fixed
terminal stations for wireless telecommunication systems with the basic restrictions or the reference
levels related to human exposure to radio frequency electromagnetic fields (110 MHz – 40 GHz) –
general public.

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.
Power density exposure limit
Install the radios for the PTP 450 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 Human exposure to radio frequency
energy on page 4-120 ) is:

10 W/m
2
for RF energy in the 3.5GHz, 3.6 GHz, 5.4-GHz and 5.8-GHz frequency bands.
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:
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
G P
S


S
G P
d
. 4
.

