User's Manual

Safety High Power Wideband Radio Head (WRH-V)
1-2 044-05251 Rev B
The FON unit contains a Class 1M laser transmitter that emits 2—4 mW of invisible
laser radiation at 1550 nm during operation and is intended for a restricted location.
Avoid direct exposure from a disconnected laser transmitter or fiber cord. For example,
do not view directly with optical instruments (magnifiers) and do not view directly with
non-attenuating optical instruments.
The FON unit has this warning label attached:
See page 3-5, Fig. 3-6 for the location of laser apertures on the FON.
Do not power up the FON unit if a fiber cable is not connected to the fiber output UL
port, or if a fiber cable is connected to the port but disconnected at the other end.
Never look at the end of a fiber cable. The 1310nm and 1550nm laser light is not
visible. Always use an instrument, such as a power meter, to detect signaling.
Human Exposure of RF Radiation
Safe distances must be kept when working around antennas. The following paragraphs describe the cautions
to be aware of during the installation and maintenance of antenna systems and how to calculate safety
distances needed for RF radiation at different antenna power and frequencies.
Antennas
To be able to receive and transmit signals, a WRH-V is connected to a donor antenna directed towards the
base station and a service antenna directed towards the coverage area. A fiber optic cable from the base
station might, however, be substituted for the donor antenna.
Installation and Maintenance of Antenna Systems
Installation and maintenance of all antenna systems must be performed with respect to the radiation exposure
limits for public areas. The antenna radiation level is affected by WRH-V output power, antenna gain, and
transmission devices such as cables, connectors, splitters and feeders. Also have in mind the system minimum
coupling loss, typically between 25dB and 35dB, is determined by a standard with the purpose to protect base
stations from noise and other performance dropping effects.
Radiation Exposure
The World Health Organization (WHO) and International Commission on Non-Ionising Radiation Protection
(ICNIRP) have determined recommendations for radiation exposure. ICNIRP recommends not to exceed the
following radiation power for public exposure:
Frequency Radiation power
800/900 MHz 4.5W/m²
1800/1900 MHz 9.0W/m²
2100 MHz 10.0W/m²
For antennas larger than 20cm the maximum radiation power can be calculated by using the following formula:
S= P/(4
πr
2
)
S = Radiation power in W/m²
P = Output power in W
r = Distance between antenna and human in meters