User's Manual Part 2
Release8InstallationandConfigurationGuide
Issue2,November2007 Draft5forRegulatoryReview 169
15 AVOIDINGHAZARDS
Use simple precautions to protect staff and equipment. Hazards include exposure to RF
waves, lightning strikes, and power surges. This section specifically recommends actions
to abate these hazards.
15.1 EXPOSURESEPARATIONDISTANCES
To protect from overexposure to RF energy, install Cyclone radios so as to provide and
maintain the minimum separation distances from all persons shown in Table 37.
Table 37: Exposure separation distances
Module Type Separation Distance from Persons
Cyclone Module, FSK or OFDM At least 20 cm (approx 8 in)
Cyclone Module with Reflector Dish At least 1.5 m (approx 60 in or 5 ft)
Cyclone Module with LENS At least 0.5 m (approx 20 in)
Antenna of connectorized 5.7 GHz AP At least 30 cm (approx 12 in)
Antenna of connectorized or integrated 900
MHz module
At least 60 sm (24 in)
Indoor 900 MHz SM At least 10 cm (4 in)
Section 15.1.1 and Table 38 give details and discussion of the associated calculations.
15.1.1 DetailsofExposureSeparationDistancesCalculationsandPowerCompliance
Margins
Limits and guidelines for RF exposure come from:
◦ 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/rpb
and Safety Code 6.
◦ 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
◦ 6 W/m
2
for RF energy in the 900-MHz frequency band in the US and Canada.
◦ 10 W/m
2
for RF energy in the 2.4-, 5.2-, 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: