Huawei Technologies RRU3252B41 RRU3252 Remote Radio Unit User Manual RRU3252 Compliance and Safety Manual

Huawei Technologies Co.,Ltd RRU3252 Remote Radio Unit RRU3252 Compliance and Safety Manual

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Manual_RRU3252 Compliance and Safety Manual_20130307_023605.pdf

Doc. Code RRU3252 Compliance and Safety Manual Issue 01 Date 2012-12-13 HUAWEI TECHNOLOGIES CO., LTD.
Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. i Copyright © Huawei Technologies Co., Ltd. 2012. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd. Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders. Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied. The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied. Huawei Technologies Co., Ltd. Address: Huawei Industrial Base Bantian, Longgang Shenzhen 518129 People's Republic of China Website: http://www.huawei.com Email: support@huawei.com
RRU3256 Compliance and Safety Manual Contents Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. ii Contents 1 Regulatory Compliance Statement ......................................................................................... 1-1 1.1 About This Chapter ....................................................................................................................................... 1-1 1.2 European Community CE Certification DoC ................................................................................................ 1-1 2 Regulatory Compliance Information ..................................................................................... 2-1 2.1 About This Chapter ....................................................................................................................................... 2-1 2.2 Regulatory Compliance Standards ................................................................................................................ 2-1 2.3 European Directives Compliance .................................................................................................................. 2-3 2.4 CISPR 22 Compliance .................................................................................................................................. 2-4 3 Safety Information ..................................................................................................................... 3-1 3.1 About This Chapter ....................................................................................................................................... 3-1 3.2 Overview ....................................................................................................................................................... 3-1 3.2.1 Safety Precautions ................................................................................................................................ 3-1 3.2.2 General Requirements .......................................................................................................................... 3-2 3.3 Electricity Safety ........................................................................................................................................... 3-3 3.3.1 High Voltage ........................................................................................................................................ 3-3 3.3.2 Thunderstorm ....................................................................................................................................... 3-4 3.3.3 Tools ..................................................................................................................................................... 3-4 3.3.4 High Electrical Leakage ....................................................................................................................... 3-4 3.3.5 Power Cable ......................................................................................................................................... 3-4 3.3.6 Fuse ...................................................................................................................................................... 3-5 3.4 Electrostatic Discharge .................................................................................................................................. 3-5 3.5 Inflammable Environment ............................................................................................................................. 3-6 3.6 Radiation ....................................................................................................................................................... 3-6 3.6.1 Electromagnetic Field Exposure .......................................................................................................... 3-6 3.6.2 Laser..................................................................................................................................................... 3-9 3.7 Working at Heights ...................................................................................................................................... 3-11 3.7.1 Weight Lifting .................................................................................................................................... 3-11 3.7.2 Safety Guide on Ladder Use .............................................................................................................. 3-12 3.8 Mechanical Safety ....................................................................................................................................... 3-13 3.8.1 Drilling ............................................................................................................................................... 3-13 3.8.2 Sharp Objects ..................................................................................................................................... 3-13 3.8.3 Handling Fans .................................................................................................................................... 3-13
RRU3256 Compliance and Safety Manual Contents Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. iii 3.8.4 Lifting Heavy Objects ........................................................................................................................ 3-14 3.9 Miscellaneous .............................................................................................................................................. 3-14 3.9.1 Inserting and Removing a Board ........................................................................................................ 3-14 3.9.2 Bundling Signal Cables ...................................................................................................................... 3-14 3.9.3 Cabling Requirements ........................................................................................................................ 3-14
RRU3232 Compliance and Safety Manual 1 Regulatory Compliance Statement Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 1-1 1 Regulatory Compliance Statement 1.1 About This Chapter This chapter provides the certification details for RRU3252: European Community CE Certification Declaration of Conformity (DoC) 1.2 European Community CE Certification DoC CE Certification Doc is not attached because this Compliance is for the United States only,
RRU3232 Compliance and Safety Manual 2 Regulatory Compliance Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 2-1 2 Regulatory Compliance Information 2.1 About This Chapter The following table lists the contents of this chapter. Title Description 2.2 Regulatory Compliance Standards The regulatory compliance standards on EMC, safety, Laser Radiation, RF, health, and environmental protection. 2.3 European Directives Compliance The compliance with European directives, including RoHS compliance and device recycling guide. 2.3 European Directives Compliance The Japan regulatory compliance. 2.4 CISPR 22 Compliance The CISPR 22 regulatory compliance. 2.2 Regulatory Compliance Standards RRU3252 complies with the standards listed in Table 2-1. Table 2-1 Regulatory compliance standards Discipline Standards EMC  CISPR22 Class B  CISPR24  EN55022 Class B  EN55024  ETSI EN 301 489 Class B  CFR 47 FCC Part 15 Class B  ICES 003 Class B  AS/NZS CISPR22 Class B
RRU3232 Compliance and Safety Manual 2 Regulatory Compliance Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 2-2 Discipline Standards  GB9254 Class B  VCCI Class B  CNS 13438 Class B Safety  IEC 60950-1  IEC60950-21  IEC60950-22  IEC60065  IEC/EN60215  IEC/EN41003  EN 60950-1  UL 60950-1  CSA C22.2 No 60950-1  AS/NZS 60950.1  BS EN 60950-1  IS 13252  GB4943  GB8898  UL50  UL60950-22 Laser safety  FDA rules, 21 CFR 1040.10 and 1040.11  IEC60825-1, IEC60825-2, EN60825-1, EN60825-2  GB7247 RF  CFR 47 FCC Part27  CFR 47 FCC Part90  IC RSS-Gen  IC RSS-192  IC RSS-197  ETSI EN 301 908-1  ETSI EN 301 908-14  ETSI EN 301 908-20  ETSI EN 302 544-1  TELEC-T139 Health  ICNIRP Guideline  1999-519-EC  EN 50385  OET Bulletin 65  IEEE Std C95.1  EN 60215
RRU3232 Compliance and Safety Manual 2 Regulatory Compliance Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 2-3 Discipline Standards Environmental protection RoHS Grounding  ITU-T K.27  ETSI EN 300 253 Note: EMC: electromagnetic compatibility RF: radio frequency CISPR: International Special Committee on Radio Interference EN: European Standard ETSI: European Telecommunications Standards Institute CFR: Code of Federal Regulations FCC: Federal Communication Commission IEC: International Electrotechnical Commission AS/NZS: Australian/New Zealand Standard VCCI: Voluntary Control Council for Interference CNS: Chinese National Standard UL: Underwriters Laboratories CSA: Canadian Standards Association BS: British Standard IS: Indian Standard GR: general requirement FDA: Food and Drug Administration DBS: distribut transceiver station GSM: Global System for Mobile communications LTE: Long Term Evolution WiMAX：Worldwide interoperability Microwave Access WLAN: wireless local area network ICNIRP: International Commission on Non-Ionizing Radiation Protection OET: Office of Engineering Technology IEEE: Institute of Electrical and Electronics Engineers RoHS: restriction of the use of certain hazardous substances 2.3 European Directives Compliance RRU3252 complies with the following European directives.  2004/108/EC (EMC)  2006/95/EC (low voltage)  1999/5/EC (R&TTE)
RRU3232 Compliance and Safety Manual 2 Regulatory Compliance Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 2-4 RRU3252 complies with Directive 2002/95/EC, on the RoHS in electrical and electronic equipment. The device does not contain lead, mercury, cadmium, and hexavalent chromium and brominated flame retardants (polybrominated biphenyls (PBB) or polybrominated diphenyl ethers (PBDE)) except for those exempted applications allowed by RoHS directive for technical reasons. RRU3252 complies with Directive 2002/96/EC on waste electrical and electronic equipment. Huawei is responsible for recycling its end-of-life devices. Contact Huawei local service center when recycling is required. The main materials in the device are steel, plastics, copper, and electronic components. Most of the materials are recyclable. Comply with the following rules for recycling at the end of life of the device.  Power off the RRU.  Wear an ESD wrist strap or a pair of ESD gloves  Loosen the screw for protecting the cabling cavity on the cover plate by using the M4 screwdriver, and then open the cabling cavity of the RRU by lifting the handle on the cover plate.  Record all the cable connections on the panel of the board to be replaced.  Disconnect the cables from the ports in the cabling cavity and on the bottom panel.  Loosen the captive screws on the two contact pieces of the main bracket by using the M4 screwdriver  Use an M6 screwdriver to tighten the screw on the adapting piece of the RRU. Using the screw only for removing the RRU, loosen the connection between the adapting piece and the main bracket, and then lift the bottom of the RRU to remove the RRU  Install a new RRU, and then waterproof the RRU  Insert all the cables to be connected to the RRU, and then check that the idle cables trough in the cabling cavity are fitted with waterproof fillers.  Close the cover plate of the cabling cavity of the RRU, and then tighten the screw for protecting the cabling cavity on the cover plate until the tightening torque reaches 1.4 N·m.  Power on the RRU. 2.4 CISPR 22 Compliance RRU3252 complies with CISPR 22 for Class B by the ITE. Class A ITE is a category of all other ITE that satisfies only the Class A ITE regulations, and not the Class B ITE regulations. Such equipment should not be restricted in its sale but the following warning shall be included in the instructions for use:
RRU3232 Compliance and Safety Manual 3 Safety Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3-1 3 Safety Information 3.1 About This Chapter The following table lists the contents of this chapter. Title Description 3.2 Overview Safety precautions to be taken before installing and maintaining the Huawei device. 3.3 Electricity Safety Information about the electricity safety. 3.4 Electrostatic Discharge Information about the electrostatic discharge safety. 3.5 Inflammable Environment Information about the inflammable environment safety. 3.6 Radiation Safety precautions on the Electromagnetic Field Exposure of the device and laser. 3.7 Working at Heights Safety precautions to be taken before using the ladders or hoisting heavy objects. 3.8 Mechanical Safety Safety precautions on drilling, on sharp objects, on handling fans, and on lifting heavy objects. 3.9 Miscellaneous Safety precautions on inserting and removing boards, on bundling signal cables, and cabling requirements. 3.2 Overview 3.2.1 Safety Precautions This section describes the safety precautions to be taken before installing and maintaining the Huawei device.  Before performing an operation, read the operation instructions and precautions to be taken, and follow them to prevent accidents. The Caution, Warning and Danger items in other documents do not cover all the safety precautions that must be followed. They are
RRU3232 Compliance and Safety Manual 3 Safety Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3-2 only supplementary information. The installation and maintenance personnel need to understand the basic safety precautions to be taken.  When operating the device, obey the local safety regulations. The safety precautions provided in the documents are supplementary and shall be in compliance with the local safety regulations.  When operating the Huawei device, in addition to the precautions, follow the specific safety instructions given by Huawei.  The installation and maintenance personnel must receive training in safety precautions. Only qualified personnel can install or maintain the device. 3.2.2 General Requirements To minimize the technically residual risk, it is imperative to obey the following rules. Read all the instructions before operation. For DC model: Reinforce insulation or double insulation must be provided to isolate DC source from the AC mains supply. Installation  The device (or system) must be installed or used in the access restricted location.  When installing the unit, always make the ground connection first and disconnect it at the end.  The device must be fixed securely on the floor or other reliable objects, such as the walls and the mounting racks before opera. Ground  Do not damage the ground conductor or operate the device in the absence of well installed ground conductor. Conduct the appropriate electrical inspection.  The device (or system) must be connected permanently to the protection ground before an operation. The cross sectional area of protective ground conductor shall be at least 16 mm². Power Supply  For DC supplied model: The device applies to DC power source that complies with the Safety Extra-Low Voltage (SELV) requirements in IEC 60950-1 based safety standards.  Prepared conductors are connected to the terminal block, and only appropriate AWG/Type of wire is secured in the listed lug terminals.  This device relies on the building’s installation for short-circuit (overcurrent) protection. Ensure that a fuse or circuit breaker no larger than 80 VDC, 25 A for DC supplied model is used on the phase conductors (all current-carrying conductors).  For this device, a readily accessible disconnect device shall be incorporated in the building installation wiring.  To reduce the risk of fire, use only No. 26 AWG or larger telecommunication line cord. Human Safety  Do not operate the device or cables at lightning strikes.  To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to telecommunication network voltage (TNV) circuits.
RRU3232 Compliance and Safety Manual 3 Safety Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3-3  Do not look directly into the optical port to prevent the laser radiation from injuring your eyes.  Do not wear jewelry or watches when you operate the device. Operator  Only qualified and skilled personnel must install, configure, and disassemble the device.  Only the personnel authorized must operate the device.  Any replacement or change to the device or parts of the device (including the software) must be done by qualified or authorized personnel of Huawei.  Any fault or error that might cause safety problems must be reported immediately to the person in charge.  Only qualified personnel must remove or disable the safety facilities, or to troubleshoot and maintain the device. Ensure that the instructions provided in this document are followed completely. The document also provides guidelines in selecting the measuring and testing device. 3.3 Electricity Safety 3.3.1 High Voltage The high voltage power supply offers power for the device operation. Direct or indirect contact (through damp objects) with high voltage and AC mains supply may result in fatal danger.  During the installation of the AC power supply facility, follow the local safety regulations. The personnel who install the AC facility must be qualified to perform high voltage and AC operations.  Do not wear conductive articles, such as watches, hand chains, bracelets and rings during the operation.  When water is found in the rack or the rack is damp, switch off the power supply immediately.  When the operation is performed in a damp environment, make sure that the device is dry. Non-standard and improper high voltage operations may result in fire and electric shock. Therefore, you must obey the local rules and regulations when bridging and wiring AC cables. Only qualified personnel must perform high voltage and AC operations.
RRU3232 Compliance and Safety Manual 3 Safety Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3-4 3.3.2 Thunderstorm High voltage and AC operations, or operations on a steel tower and a mast are prohibited during thunderstorm. During thunderstorm, the electromagnetic field generated in the thunderstorm area may damage the electronic parts. To prevent damage to the device during lightning, ground the device properly. 3.3.3 Tools Suggestion: Dedicated tools must be used during high voltage and AC operations. Avoid using ordinary tools. 3.3.4 High Electrical Leakage Ground the device before powering on the device. Otherwise, the personnel and device are in danger. If the "high electrical leakage" flag is stuck to the power terminal of the device, you must ground the device before powering it on. 3.3.5 Power Cable Installation and removal of live line are prohibited. Transient contact between the core of the power cable and the conductor may generate electric arc or spark, which may cause fire or eye injury.  Before installing or removing the power cable, turn off the power switch.  Before connecting the power cable, confirm that the power cable and label comply with the requirements of the actual installation.
RRU3232 Compliance and Safety Manual 3 Safety Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3-5  For the DC power supplied device, use 3.3mm² or 12AWG at least minimum power supply cord.  Use the type H03VV-F or light PVC sheathed flexible cord based on IEC 60227. 3.3.6 Fuse If a fuse is to be replaced, the new fuse shall be of the same type and specifications. Table 3-1 lists the fuses that will affect the safety of the device (or system). Use fuses according to this list. Table 3-1 Fuse description Position Manufacturer Type Rating NA NA NA NA 3.4 Electrostatic Discharge The static electricity generated by the human body may damage the electrostatic sensitive components on the circuit board, such as the large-scale integrated circuit (LSI). In the following situations, the human body will generate a static electromagnetic field:  Human body moving  Clothes friction  Friction between shoes and the ground  Holding ordinary plastic in hand The static electromagnetic field will remain within the human body for a long time. Before touching the device, hand-operating parts, circuit boards, or ASICs, wear a grounded electrostatic discharge (ESD) wrist strap. It can prevent the sensitive components from damage by the static electricity in the human body.
RRU3232 Compliance and Safety Manual 3 Safety Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3-6 Figure 3-1 shows the wearing of an ESD wrist strap. Figure 3-1 Wearing an ESD wrist strap 3.5 Inflammable Environment Operating the electrical device in inflammable environment can be fatal. Do not place the device in the environment that has inflammable and explosive air or fog. Do not perform any operation in this environment. 3.6 Radiation 3.6.1 Electromagnetic Field Exposure
RRU3232 Compliance and Safety Manual 3 Safety Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3-7 Radio-frequency signals with high intensity are harmful to human body. Before installing or maintaining an antenna in a steel tower or a mast with a large number of transmitter antennas, the operator should coordinate with the parties concerned to shut down the transmitter antennas. Introduction The BTS emits RF radiation (radiation hazard). Operators have to follow the related local regulations when erecting the BTS. Operators of BTSs must also follow the related local regulations when erecting the BTS. Limits and Guidelines on Exposure to Electromagnetic Fields There are a number of international regulations, standards and guidelines for exposure to electromagnetic fields. Several European countries have adopted the recommendation of the council of the European Union. It was released on July 12, 1999 focusing on the harmful effects of exposure to electromagnetic fields (1999/519/EC). The recommendation is based on the guideline published by the ICNIRP. Table 3-2 gives a comparison among regulations and reference levels applied in different countries. Table 3-2 Different regulations and reference Country Limit 950 MHz E Electric Field Strength Limit 950 MHz S Power Flux Density Limit 1850 MHz E Electric Field Strength Limit 1850 MHz S Power Flux Density ICNIRP International 42 V/m 4.75 W/m2 59 V/m 9.25 W/m2 Europe (1999/519/EC) 42 V/m 4.75 W/m2 59 V/m 9.25 W/m2 Italy, Decreto No. 381, 1998 6 V/m 0.095 W/m2 6 V/m 0.095 W/m2 Switzerland Verord. 1999 4 V/m 0.043 W/m2 6 V/m 0.096 W/m2 Reference levels are provided for exposure assessment, that is to determine whether the basic limit of restriction on exposure of humans to electromagnetic fields is exceeded. The basic restriction on exposure to electromagnetic fields is based on established health effects and biological considerations.
RRU3232 Compliance and Safety Manual 3 Safety Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3-8 Location of Base Station Antennas Base station antennas, the source of the radiation, are usually mounted:  On freestanding towers, with a height up to 30 m, or  On a tower on the top of buildings, or  On rare occasion, to the side of the building. Generally, the height of the antenna position does not fall below 10 m. The power usually forms a horizontal main beam and is slightly tilted downward. The remaining power forms into the weaker beams on both sides of the main beam. The main beam, however, does not reach ground level until the distance from the antenna position is around 50–200 m. The highest level of emission would be expected in close vicinity of the antenna and in line of sight to the antenna. Exclusion Zones The requirements for exclusion zones are as follows:  Antenna location should be designed so that the public cannot access the area where the RF radiation exceeds the levels as described earlier.  If areas, where the RF radiation exceeds the prescribed level, are accessible to the workers, make sure that workers know where these areas are, and that they can power off (or shut down) the transmitters before entering these areas. Such areas may not exist; but if they do, they will be confined to areas within 10 m of the antennas.  Each exclusion zone should be defined by a physical barrier and by a recognizable sign warning the public or workers. Guidelines on Arranging Antenna Sites The guidelines on arranging the antenna sites are as follows:  For roof-mounted antennas, raise the antennas above the height of the persons, who may have to work in the rooftop.  For roof-mounted antennas, keep the transmitter antennas away from the areas where people are most likely to be, such as roof access points, telephone service points, and HVAC device.  For roof-mounted directional antennas, place the antennas near the periphery, and do not make the antennas face to the building.  Consider the trade-off between large aperture antennas (lower maximum RF) and small aperture antennas (lower visual impact).  Pay special attention to keep higher-power antennas away from accessible areas.  Keep the antennas in a site that is far away, though this may contradict the local zone requirements.  Exercise extra caution when designing co-location sites, that is, where multiple antennas owned by different companies are located. This applies particularly to sites that include high-power broadcast (FM/TV) antennas. Local zone often favors co-location, but co-location may cause safety problems.  Take special precautions for antenna sites near hospital and schools.
RRU3232 Compliance and Safety Manual 3 Safety Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3-9 Location of Base Transceiver Station The base transceiver station (BTS) is shielded from RF radiation hazards. The device has been tested to comply with the radioactive spurious emission requirements of EN 301 502. These limits fall below the limits for RF radiation hazard. Therefore, the BTS does not cause danger to the public and workers under normal operation condition. However, it is still possible that because of imperfect antenna cables or other faults the limits set out above can be exceeded.  BTS sites shall not be accessible to the public. Only authorized and trained workers should access sites or rooms.  Doors of the site or room shall be clearly marked. For example, mark a sign warning the workers that inside the site or room where the RF radiation might exceed limits for radiation exposure.  BTS sites shall be regularly monitored and inspected after installation. Prediction of the Exposure to Electromagnetic Fields The section provides a theoretical approach to calculate possible exposure to electromagnetic radiation around a BTS antenna. Precise statements are possible either with measurements or complex calculations considering the complexity of the environment, such as soil conditions, nearby buildings and other obstacles. The complexity may cause reflections and deflection, scattering of electromagnetic fields. The maximum output power (given in EIRP) of a BTS is usually limited by license conditions of the network operator. RRU3252 supports the maximum output power of 20W（single channle） A rough estimation of the expected exposure in power flux density on a given point can be made with the following equation: π∗∗∗=)(4)(2mrGWPSnumeric P = Maximum output power in W G numeric = Numeric gain (see below) r = Distance between the antenna and the point of exposure in meters For the calculation of the Gain numeric: 1010GdBnumericG= )()()()( dBBdBBdBBdBGGdBnattenuatiohorizontalonattenutativerticalcableantenna −−−−−= B = attenuation in dB So, the distance (r) should be more than 6.6 m as safety distance. 3.6.2 Laser The laser hazard level of this device is Class 1.
RRU3232 Compliance and Safety Manual 3 Safety Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3-10 When handling optical fibers, do not stand close to, or look at the optical fiber outlet directly with unaided eyes. General Laser Information Laser transceivers or transmitters are used in the optical transmission system and associated test tools. The wavelength of the laser is between 780 nm and 1600 nm. Because the laser is transmitted through the optical fiber, it has very high power density and is invisible to human eyes. When a beam of light enters the eye, the retina may be damaged. Laser of wavelengths used in telecommunications can cause thermal damage to the retina. Lasers used in lightwave systems have a larger beam divergence, typically 10 to 20 degrees. Viewing an un-terminated fiber or damaged fiber with the unaided eye at distances greater than 150 mm (6 inches) will normally not cause eye injury. However, damage may occur if an optical tool such as a microscope, magnifying glass or eye loupe is used to view the energized fiber end. In its normal operating mode, a lightwave system is totally enclosed and presents no risk of eye injury. Additional safety is achieved by an automatic laser shut-down (ALS) of the system. The ALS, however, can be applied for bi-directional transmission only. If the receiver side does not detect the laser from the transmission side, it will give the transmission side a signal. Upon receiving the signal, the ALS will shut down the laser emission within 100 ms. Laser Safety Guidelines Read the following guidelines to avoid laser radiation:  Read the instructions before installing, operating and maintaining the device. Ignoring the instructions can cause exposure to dangerous laser radiation.  Wear a pair of eye-protective glasses when you are handling lasers or fibers.  All the operation shall be performed by personnel who have completed the approved training courses.  Make sure that the optical source is switched off before disconnecting optical fiber connectors.  Before opening the front door of an optical transmission system, make sure that you are not exposed to laser radiation.  Do not look at the end of an exposed fiber or an open connector when you are not sure whether the optical source is switched off or not.  Use an optical power meter to check and ensure that the optical source is switched off by measuring the optical power.  Do not use an optical tool such as a microscope, a magnifying glass or an eye loupe to view the optical connector or fiber. Handling Fibers Read the instructions before handling fibers.  Cutting and splicing fibers must be performed by the trained personnel only.
RRU3232 Compliance and Safety Manual 3 Safety Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3-11  Before cutting or splicing a fiber, ensure the fiber is disconnected from the optical source. After disconnecting the fiber, use protecting caps to protect all the optical connectors. 3.7 Working at Heights When working at heights, be careful to prevent objects from falling. When working at heights, shall comply with the following requirements.  The personnel who work at heights must be trained.  The operating machines and tools shall be carried and handled safely to avoid falling.  Safety protection measures, such as wearing a helmet and a safety belt, shall be taken.  In cold regions, wear worm clothes when performing high-altitude operation.  All lifting appliances must be thoroughly checked before the work is started. 3.7.1 Weight Lifting Do not access the areas under the jib arm and the goods in suspension when lifting weight.  Ensure the operators have completed the related training and are qualified.  Check the weight lifting tools and confirm that the tools are in good condition.  Lift the weight only when the weight lifting tools are firmly fixed onto the weight-bearing object or the wall.  Use a concise command to avoid incorrect operation.  Ensure the angle between the two cables is less than or equal to 90 degrees during the lift. (see Figure 3-2).
RRU3232 Compliance and Safety Manual 3 Safety Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3-12 Figure 3-2 Weight lifting Maximum 90° 3.7.2 Safety Guide on Ladder Use Checking the Ladder Before using the ladder, first check if the ladder is in good condition. Make sure that you know the maximum weight that the ladder can support; overweight on the ladder is strictly prohibited. Placing the Ladder Slant angle is suggested to be 75 degrees. The slant can be measured with the angle square or with arms. When using a ladder, place the wider end of the ladder on the ground. Otherwise, take protective measures on the base part of the ladder to avoid skidding. Place the ladder on stable ground.
RRU3232 Compliance and Safety Manual 3 Safety Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3-13 Climbing the Ladder When climbing the ladder, note the following.  Ensure the gravity center of your body does not deviate from the ladder edge.  To lessen the danger and ensure the safety, hold your balance on the ladder before any operation.  Do not climb higher than the forth highest step of the ladder.  If you are about to climb to the top, the length of the ladder shall be one meter higher than the eave. 3.8 Mechanical Safety 3.8.1 Drilling Drilling on the rack without permission is strictly prohibited. Drilling that does not satisfy the requirements concerned may damage the wires and cables inside the rack. If the metal shavings from the drilling fall into the rack, it may result in short circuit of the circuit boards.  Before drilling a hole on the rack, wear insulation gloves, and remove the cables inside the rack.  During the drilling, ensure that your eyes are well protected. The hot shavings may injury to your eyes.  Ensure that the metal shavings do not get into the rack.  Non-standard drilling may damage the electromagnetic shielding performance of the rack.  After drilling, clean the metal shavings in time. 3.8.2 Sharp Objects When carrying the device by hand, wear protection gloves to avoid injury by sharp objects. 3.8.3 Handling Fans Ensure the following:  When replacing a component, place the component, screw, and tool at a safe place to prevent them from falling into the running fan.
RRU3232 Compliance and Safety Manual 3 Safety Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3-14  When replacing the ambient equipment around the fan, do not place the finger or board into the running fan until the fan is switched off and stops running. 3.8.4 Lifting Heavy Objects When lifting heavy objects, do not stand or walk under the arm or the lifted object. 3.9 Miscellaneous 3.9.1 Inserting and Removing a Board To insert or remove a board, abide by the following requirements: When inserting a board, handle it gently to avoid distorting pins on the backplane.  Insert the board along the slot guide.  The two sides of one board should not contact another board to avoid short-circuit or scratch.  When holding a board in hand, do not touch the board circuit, components, connectors, or connection slots. 3.9.2 Bundling Signal Cables  Bundle the signal cables separately from the strong current cables or high voltage cables.  Maintain a minimum space of 150 mm between adjacent ties. 3.9.3 Cabling Requirements At a very low temperature, movement of the cable may damage the plastic skin of the cable. To ensure the construction safety, comply with the following requirements:  When installing cables, ensure that the environment temperature is above 0°C.  If cables are stored in the place below 0°C, move the cables into a place at a room temperature and store the cables for more than 24 hours before installation.
RRU3232 Compliance and Safety Manual 3 Safety Information Issue 01 (2012-02-22) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3-15  Move the cables with care, especially at a low temperature. Do not drop the cables directly from the vehicle.

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