Huawei DBS3900 Installation Manual page 297

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Restricted Area of Electromagnetic Field Exposure
An area with excessive electromagnetic field exposure (restricted area) is a hazardous area at
a certain distance from the equipment or facility as required by exposure control limits of
related regulations, so as to control public or operator exposure to electromagnetic field. Take
proper measures to ensure the safe distance from electromagnetic field exposure, including
but not limited to:
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Installation and Use of a Wireless Base Station Transceiver
A base transceiver station (BTS) is properly designed so that its RF electromagnetic radiation
is under the related standard limits of RF radiation hazard. Therefore, a normal working BTS
does no harm to the public and working personnel. However, a BTS with defective antenna
cables or other defects may result in excessive RF electromagnetic radiation.
Professional personnel should abide by the following rules in BTS installation and operation:
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If the equipment is a radio transmitter or product supporting radio transmission, exposure
of radio electromagnetic field (electromagnetic radiation) should be considered.
For the high-voltage equipment or facility, exposure of power frequency electromagnetic
field should be considered.
When professional equipment or facility (such as wireless base station transceiver) is
deployed, the user (such as radio service carrier) must comply with local laws and
regulations.
Before the equipment structure or antenna is modified, re-evaluation of electromagnetic
field exposure should be considered.
Before the radio frequency (RF) output specifications or parameters are modified, re-
evaluation of electromagnetic field exposure should be considered.
Before the site environment of professional equipment or facility is changed, re-
evaluation of electromagnetic field exposure should be considered.
Plan the professional equipment or facility site in an inaccessible area to the public, and
do not publicize the location.
Allow only authorized and instructed person to access the professional equipment or
facility site.
Before entering the area with excessive electromagnetic field exposure, professional
personnel should know the location of the restricted area and shut down the transmitter.
Set clear signs at the site to remind professional personnel that the current location is in
or may be in the area with excessive electromagnetic field exposure.
After site installation, conduct regular monitoring and checks.
Set effective physical shields and apparent warning signs in all areas with excessive
electromagnetic field exposure.
Install an isolating device outside the equipment structure.
Comply with local regulations in operations.
Before installing and operating a BTS and its antenna, read safety recommendations and
comply with local regulations.
Before installing or maintaining an antenna close to the tower or mast with a BTS and its
antenna, contact related personnel to shut down the antenna transmitter.
If necessary, working personnel at the site should carry radiation monitoring and alarm
instrument.
Safety Information