Avoiding Hazards
18
2 Avoiding Hazards
2.1
Preventing Overexposure to RF Energy
Caution
To protect from overexposure to RF energy, install the radios for the 500 family of PTP
wireless solutions so as to provide and maintain the minimum separation distances from all persons
as shown in
.
When the system is operational, avoid standing directly in front of the antenna. Strong RF fields
are present when the transmitter is on. The Outdoor Unit (ODU) must not be deployed in a
location where it is possible for people to stand or walk inadvertently in front of the antenna.
At these and greater separation distances, the power density from the RF field is below generally
accepted limits for the general population.
Note
These are conservative distances that include compliance margins.
2.1.1
Calculations for Separation Distances and Power Compliance Margins
Limits and guidelines for RF exposure come from:
•
US FCC limits for the general population. See the FCC web site at
,
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.
•
ICNIRP (International Commission on Non-Ionizing Radiation Protection) guidelines for the
general public.
See the ICNIRP web site at
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/m2 for RF energy in the 900-MHz frequency band in the US and Canada.
•
10 W/m2 for RF energy in the 2.4-, 5.2-, 5.4-, and 5.8-GHz frequency bands.
Peak power density in the far field of a radio frequency point source is calculated as follows:
S
=
P.G
4
πd
2
(1)
Where:-
S
= power density
W
/
m
2
P
= Maximum Average transmit power capability of the radio W
G
= total Tx gain as a factor, converted from dB
d
= distance from point source
m
Содержание MOTOWI 4
Страница 1: ...PTP 500 Series User Guide phn 1115 000v001 ...
Страница 74: ...Web Page Reference 74 Figure 37 Save Configuration File Screen ...
Страница 100: ...Web Page Reference 100 Figure 59 Spectrum Management as seen from the Master ...
Страница 108: ...Web Page Reference 108 Figure 66 Spectrum Management Master Screen With Operational Restrictions ...
Страница 112: ...Web Page Reference 112 Figure 68 Remote Management ...
Страница 165: ...Data Rate Calculations 165 Figure 112 QPSK 0 50 Single Payload Figure 113 QPSK 0 75 Single Payload ...
Страница 166: ...Data Rate Calculations 166 Figure 114 16 QAM 0 50 Single Payload Figure 115 16 QAM 0 75 Single Payload ...
Страница 167: ...Data Rate Calculations 167 Figure 116 64 QAM 0 67 Single Payload Figure 117 64 QAM 0 83 Single Payload ...
Страница 168: ...Data Rate Calculations 168 Figure 118 256 QAM 0 75 Single Payload Figure 119 QPSK 0 50 Dual Payload ...
Страница 169: ...Data Rate Calculations 169 Figure 120 QPSK 0 75 Dual Payload Figure 121 16 QAM 0 50 Dual Payload ...
Страница 170: ...Data Rate Calculations 170 Figure 122 16 QAM 0 75 Dual Payload Figure 123 64 QAM 0 67 Dual Payload ...
Страница 171: ...Data Rate Calculations 171 Figure 124 64 QAM 0 83 Dual Payload Figure 125 256 QAM 0 75 Dual Payload ...
Страница 197: ...Glossary 197 UTP Unshielded Twisted Pair VLAN Virtual Local Area Network ...
