Powerwave Technologies Inc. 5JS0109 Manuale Utente
Electrostatic Discharge (ESD)
Nexus RT
iv
044-05311 Rev A
Warning Signs
The following warning signs must be observed and be kept clean and readable.
Beryllium oxide
This warning sign to the left is applied to boards and units which contain beryllium oxide parts.
This warning sign below is applied at the bottom, inside the cabinet, below the power supply unit.
Beryllium oxide
This warning sign to the left is applied to boards and units which contain beryllium oxide parts.
This warning sign below is applied at the bottom, inside the cabinet, below the power supply unit.
Human Exposure to 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.
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.
Repeater Antennas
To be able to receive and transmit signals, a repeater 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.
To be able to receive and transmit signals, a repeater 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 the 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.
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 the 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
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:
formula:
Electrostatic Discharge (ESD)
ESD can severly damage essential parts of the equipment if not handled carefully. Parts on
Printed Circuit Board Assemblies (PCBA) as well as other parts in the equipment are
sensitive to ESD. Never touch the PCBA or uninsulated conductor surfaces unless
absolutely necessary.
If you must handle the PCBAs or uninsulated conductor surfaces, use ESD protective
equipment or first touch the chassis with your hand. Never let your clothes touch PCBAs or
uninsulated conductor surfaces and always store PCBAs in ESD-safe bags.
Printed Circuit Board Assemblies (PCBA) as well as other parts in the equipment are
sensitive to ESD. Never touch the PCBA or uninsulated conductor surfaces unless
absolutely necessary.
If you must handle the PCBAs or uninsulated conductor surfaces, use ESD protective
equipment or first touch the chassis with your hand. Never let your clothes touch PCBAs or
uninsulated conductor surfaces and always store PCBAs in ESD-safe bags.
S= P/(4
π
r
2
)
S = Radiation power in W/m²
P = Output power in W
r = Distance between antenna and human in meters
P = Output power in W
r = Distance between antenna and human in meters
Beryllium
oxide
hazard
BERYLLIUM OXIDE
(Toxic)
used in equipment
see instruction book