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Bts3900 gsm site preparation guidelines (v300 r008-03)

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Bts3900 gsm site preparation guidelines (v300 r008-03)

  1. 1. BTS3900 GSM V300R008 Site Preparation Guidelines Issue 03 Date 2008-07-15 Part Number Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd
  2. 2. Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. For any assistance, please contact our local office or company headquarters. 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 Copyright © Huawei Technologies Co., Ltd. 2008. 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 the property of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders. Notice 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 the statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd
  3. 3. BTS3900 GSM Site Preparation Guidelines Contents Contents About This Document.....................................................................................................................1 1 Safety Information.....................................................................................................................1-1 1.1 Safety Precautions...........................................................................................................................................1-1 1.2 Electricity Safety.............................................................................................................................................1-3 1.3 Inflammable Environment...............................................................................................................................1-5 1.4 Battery.............................................................................................................................................................1-5 1.5 Radiation.........................................................................................................................................................1-7 1.6 Working at Heights.........................................................................................................................................1-9 1.7 Mechanical Safety.........................................................................................................................................1-11 1.8 Others............................................................................................................................................................1-12 2 Requirements for the Equipment Room................................................................................2-1 2.1 Site Selection Requirements for the BTS3900................................................................................................2-2 2.2 Space and Location Requirements of the BTS3900........................................................................................2-2 2.3 Construction Requirements for the Equipment Room....................................................................................2-4 2.4 Environment Requirements for Operating the BTS3900................................................................................2-6 3 Power Supply Requirements for the BTS3900.....................................................................3-1 4 Requirements for Lightning Protection and Grounding System of the BTS3900.........4-1 5 Transmission Requirements for the BTS Site......................................................................5-1 6 Arranging for Auxiliary Facilities for the BTS3900 Site.....................................................6-1 6.1 Installing Cable Racks.....................................................................................................................................6-2 6.1.1 Introduction to Cable Racks...................................................................................................................6-2 6.1.2 Procedure for Installing the Cable Rack.................................................................................................6-4 6.1.3 Installing the Indoor Cable Rack............................................................................................................6-5 6.1.4 Installing the Outdoor Cable Rack.......................................................................................................6-11 6.1.5 Connecting Cable Ladders...................................................................................................................6-14 6.1.6 Installing the Cable Trough..................................................................................................................6-20 6.1.7 Installing Accessories...........................................................................................................................6-24 6.2 Installing the Grounding Bar of the BTS......................................................................................................6-26 7 Arranging for Auxiliary Facilities of the BTS3900 Antenna System...............................7-1 7.1 Requirements for the Tower............................................................................................................................7-2 Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd i
  4. 4. BTS3900 GSM Site Preparation Guidelines Contents 7.2 Installing the Antenna Support on the Tower.................................................................................................7-4 7.3 Installing the Antenna Support on the Rooftop...............................................................................................7-6 7.4 Installing the Feeder Window.......................................................................................................................7-11 8 Requirements for Cables of the BTS......................................................................................8-1 8.1 Requirements for Cable Materials and Auxiliary Devices of the BTS...........................................................8-2 8.2 Cabling Specifications.....................................................................................................................................8-2 9 Checklist for BTS3900 Site Preparations...............................................................................9-1 ii Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  5. 5. BTS3900 GSM Site Preparation Guidelines Figures Figures Figure 1-1 Wearing an ESD wrist strap...............................................................................................................1-5 Figure 1-2 Lifting a weight................................................................................................................................1-10 Figure 1-3 Slant angle........................................................................................................................................1-11 Figure 1-4 One meter higher than the eave........................................................................................................1-11 Figure 2-1 Space requirements of the BTS3900 cabinet (unit: mm)....................................................................2-3 Figure 2-2 Installation directions of the cabinets.................................................................................................2-3 Figure 2-3 Location requirements of the BTS3900 cabinet (unit: mm)...............................................................2-4 Figure 4-1 Grounding grids..................................................................................................................................4-3 Figure 6-1 Cable ladder........................................................................................................................................6-3 Figure 6-2 U-shape connecting piece...................................................................................................................6-3 Figure 6-3 Bracket angle......................................................................................................................................6-3 Figure 6-4 Cable manager....................................................................................................................................6-3 Figure 6-5 Triangular support..............................................................................................................................6-3 Figure 6-6 Connecting clip...................................................................................................................................6-3 Figure 6-7 Fixing clip...........................................................................................................................................6-4 Figure 6-8 Cable trough.......................................................................................................................................6-4 Figure 6-9 Movable bushing................................................................................................................................6-4 Figure 6-10 End cover..........................................................................................................................................6-4 Figure 6-11 Rectangular frame.............................................................................................................................6-4 Figure 6-12 U-steel...............................................................................................................................................6-4 Figure 6-13 Over-cabinet support........................................................................................................................6-4 Figure 6-14 Cable rack installed on the ceiling....................................................................................................6-7 Figure 6-15 Cable rack installed on the ceiling with an obstacle.........................................................................6-8 Figure 6-16 Fixing the triangular support............................................................................................................6-9 Figure 6-17 Fixing the cable ladder.....................................................................................................................6-9 Figure 6-18 Fixing the over-cabinet supports....................................................................................................6-10 Figure 6-19 Fixing the cable ladder...................................................................................................................6-11 Figure 6-20 Rectangular frame...........................................................................................................................6-11 Figure 6-21 Installing the outdoor cable rack on the floor.................................................................................6-13 Figure 6-22 Installing the outdoor cable rack on the wall..................................................................................6-14 Figure 6-23 Docking cable ladders....................................................................................................................6-15 Figure 6-24 Ladders turned on the same level (no cable trough).......................................................................6-16 Figure 6-25 Turning the cable ladder at different levels....................................................................................6-17 Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd iii
  6. 6. BTS3900 GSM Site Preparation Guidelines Figures Figure 6-26 Connecting the cable ladder to the wall..........................................................................................6-18 Figure 6-27 Front connection of cable ladders...................................................................................................6-19 Figure 6-28 Side connection of cable ladders....................................................................................................6-19 Figure 6-29 Oblique connection of cable ladders...............................................................................................6-20 Figure 6-30 Connecting cable troughs...............................................................................................................6-21 Figure 6-31 Installing a cable trough on the 200-mm or 400-mm wide cable ladder........................................6-21 Figure 6-32 Installing cable troughs onto the 600mm wide cable ladder..........................................................6-22 Figure 6-33 Cutting off the upper side of the triangle aperture .........................................................................6-23 Figure 6-34 Installing a sloping cable trough.....................................................................................................6-23 Figure 6-35 Installed sloping cable trough ........................................................................................................6-24 Figure 6-36 Cable manager on the cable rack that is not installed with a cable trough.....................................6-25 Figure 6-37 Cable manager on the cable rack that is installed with a cable trough...........................................6-25 Figure 6-38 Installing the end cover, the bushing, and the baffle ring...............................................................6-26 Figure 6-39 Structure of the grounding bar........................................................................................................6-27 Figure 6-40 Installation of the grounding bar....................................................................................................6-27 Figure 6-41 Sectional view of the grounding bar...............................................................................................6-28 Figure 7-1 Telecommunication tower..................................................................................................................7-2 Figure 7-2 Installing the antenna support on the tower........................................................................................7-5 Figure 7-3 Structure of the antenna support (unit: mm).......................................................................................7-6 Figure 7-4 Antenna support base vertically fixed to the rooftop..........................................................................7-7 Figure 7-5 Structure of the antenna support directly installed on the rooftop......................................................7-8 Figure 7-6 Installing the fixing clip of the antenna support onto the wall...........................................................7-9 Figure 7-7 Antenna support fixed to the wall (higher than 1200 mm).................................................................7-9 Figure 7-8 Antenna support fixed to the wall (lower than 1200 mm)................................................................7-10 Figure 7-9 Dimensions of the 12-hole feeder window (unit: mm) ....................................................................7-11 Figure 7-10 Structure of 12-hole feeder window...............................................................................................7-12 Figure 7-11 Holes for securing the feeder window (unit: mm) .........................................................................7-13 Figure 7-12 Installing the feeder window..........................................................................................................7-14 iv Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  7. 7. BTS3900 GSM Site Preparation Guidelines Tables Tables Table 2-1 Requirements for the dust concentration in the equipment room........................................................2-5 Table 2-2 Climatic requirements..........................................................................................................................2-6 Table 2-3 Requirements for the density of chemically active substances............................................................2-7 Table 2-4 Mechanical stress requirements...........................................................................................................2-7 Table 3-1 AC voltage and allowable range..........................................................................................................3-3 Table 6-1 Items required for mounting a cable rack.............................................................................................6-3 Table 7-1 Requirements for the tower..................................................................................................................7-3 Table 9-1 Checklist for the site.............................................................................................................................9-1 Table 9-2 Checklist for the power supply............................................................................................................9-2 Table 9-3 Checklist for the grounding system......................................................................................................9-2 Table 9-4 Checklist for the antenna system..........................................................................................................9-3 Table 9-5 Checklist for the transmission access...................................................................................................9-3 Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd v
  8. 8. BTS3900 GSM Site Preparation Guidelines About This Document About This Document Purpose Before installing the BTS3900 GSM hardware, you need to carry out a site survey to select an appropriate site to ensure proper operation of the BTS3900 GSM. This document serves as the reference for carrying out a survey to select a BTS3900 GSM site. It describes the requirements for site selection, power supply, grounding system, and antenna system. This document also serves as a reference for the BTS installers on how to select an appropriate site. Product Version The following table lists the product version related to this document. Product Name Product Version BTS3900 GSM(hereinafter referred to as BTS3900) V300R008 Intended Audience l BTS installers Change History For changes in the document, refer to Changes in BTS3900 GSM Site Preparation Guidelines. Organization 1 Safety Information 2 Requirements for the Equipment Room Planning the installation space in compliance with site requirements is essential for installing, commissioning, and stable running of the BTS3900. The requirements for the equipment room involve site selection, space and position, construction, and operating environment. 3 Power Supply Requirements for the BTS3900 Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 1
  9. 9. BTS3900 GSM Site Preparation Guidelines About This Document To ensure proper operation of the BTS3900 power system, parameters of the power input must meet corresponding specifications. 4 Requirements for Lightning Protection and Grounding System of the BTS3900 To ensure smooth operation of the BTS3900, the lightning protection and grounding system must meet the specified requirements. 5 Transmission Requirements for the BTS Site The transmission devices should be arranged before the site construction. The transmission requirements for the BTS3900 site consist of DDF and transmission requirements. 6 Arranging for Auxiliary Facilities for the BTS3900 Site Auxiliary facilities of the BTS3900 site consist of cable racks, cable troughs, grounding bars, and transmission devices. The auxiliary facilities should be arranged before you install the BTS3900. 7 Arranging for Auxiliary Facilities of the BTS3900 Antenna System Before installing the BTS3900 antenna system, you need to arrange for auxiliary facilities such as the tower, antenna support, and feeder window as required by the scenario. 8 Requirements for Cables of the BTS This describes the requirements for the cables of the BTS. The cables of the BTS such as the power cable, signal cable, and grounding cable should meet the requirements for materials, cabling specifications, and configuration of auxiliary devices. 9 Checklist for BTS3900 Site Preparations This provides the checklist for site preparations. The checklist for BTS3900 site preparations covers the site location, power supply, grounding system, antenna system, and transmission system. Conventions 1. Symbol Conventions The following symbols may be found in this document. They are defined as follows Symbol Description DANGER WARNING CAUTION TIP 2 Indicates a hazard with a high level of risk that, if not avoided, will result in death or serious injury. Indicates a hazard with a medium or low level of risk which, if not avoided, could result in minor or moderate injury. Indicates a potentially hazardous situation that, if not avoided, could cause equipment damage, data loss, and performance degradation, or unexpected results. Indicates a tip that may help you solve a problem or save your time. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  10. 10. BTS3900 GSM Site Preparation Guidelines About This Document Symbol Description Provides additional information to emphasize or supplement important points of the main text. NOTE 2. General Conventions Convention Description Times New Roman Normal paragraphs are in Times New Roman. Boldface Names of files,directories,folders,and users are in boldface. For example,log in as user root . Italic Book titles are in italics. Courier New Terminal display is in Courier New. 3. Command Conventions Convention Description Boldface The keywords of a command line are in boldface. Italic Command arguments are in italic. [] Items (keywords or arguments) in square brackets [ ] are optional. {x | y | ...} Alternative items are grouped in braces and separated by vertical bars.One is selected. [ x | y | ... ] Optional alternative items are grouped in square brackets and separated by vertical bars.One or none is selected. { x | y | ... } * Alternative items are grouped in braces and separated by vertical bars.A minimum of one or a maximum of all can be selected. [ x | y | ... ] * Alternative items are grouped in braces and separated by vertical bars.A minimum of zero or a maximum of all can be selected. 4. GUI Conventions Convention Description Boldface Buttons,menus,parameters,tabs,window,and dialog titles are in boldface. For example,click OK. > Multi-level menus are in boldface and separated by the ">" signs. For example,choose File > Create > Folder . 5. Keyboard Operation Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3
  11. 11. BTS3900 GSM Site Preparation Guidelines About This Document Convention Description Key Press the key.For example,press Enter and press Tab. Key1+Key2 Press the keys concurrently.For example,pressing Ctrl+Alt+A means the three keys should be pressed concurrently. Key1,Key2 Press the keys in turn.For example,pressing Alt,A means the two keys should be pressed in turn. 6. Mouse Operation Action Click Select and release the primary mouse button without moving the pointer. Double-click Press the primary mouse button twice continuously and quickly without moving the pointer. Drag 4 Description Press and hold the primary mouse button and move the pointer to a certain position. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  12. 12. BTS3900 GSM Site Preparation Guidelines 1 Safety Information 1 Safety Information 1.1 Safety Precautions This section describes certain safety precautions and helps to choose the measurement device and testing device. Read and follow these safety precautions before installing, operating, and maintaining Huawei devices. Following All Safety Precautions Before any operation, read the instructions and precautions in this document carefully to minimize the possibility of accidents. The Danger, Caution, and Note items in the package of documents do not cover all the safety precautions that must be followed. They only provide the generic safety precautions for operations. Symbols DANGER This symbol indicates that casualty or serious accident may occur if you ignore the safety instruction. CAUTION This symbol indicates that serious or major injury may occur if you ignore the safety instruction. NOTE This symbol indicates that the operation may be easier if you pay attention to the safety instruction. Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 1-1
  13. 13. BTS3900 GSM Site Preparation Guidelines 1 Safety Information Complying with the Local Safety Regulations When operating the device, comply with the local safety regulations. The safety precautions provided in the documents are supplementary. You must comply with the local safety regulations. General Installation Requirements The personnel in charge of installation and maintenance must be trained and master the correct operating methods and safety precautions before beginning work. The rules for installing and maintaining the device are as follows: l Only the trained and qualified personnel can install, operate and maintain the device. l Only the qualified specialists are allowed to remove the safety facilities, and repair the device. l Any replacement of the device or part of the device (including the software) or any change made to the device must be performed by qualified or authorized personnel of Huawei. l Any fault or error that might cause safety problems must be reported immediately to the personnel in charge. Grounding Requirements The following requirements are applicable to the device to be grounded: l Ground the device before installation and remove the ground cable after uninstallation. l Do not operate the device in the absence of a ground conductor. Do not damage the ground conductor. l The unit (or system) must be permanently connected to the protection ground before operation. Check the electrical connection of the device before operation and ensure that the device is reliably grounded. Safety of Personnel Ensure the following: l When lightning strikes, do not operate the device and cables. l When lightning strikes, unplug the AC power connector. Do not use the fixed terminal or touch the terminal or antenna connector. NOTE The previous two requirements are suitable for the wireless fixed terminal. l l To prevent laser radiation from injuring your eyes, never look into the optical fiber outlet with unaided eyes. l 1-2 To prevent electric shock, do not connect safety extra-low voltage (SELV) circuits to telecommunication network voltage (TNV) circuits. To prevent electric shock and burns, wear the electrostatic discharge (ESD) clothing, gloves and wrist strap, and remove conductors such as jewelry and watch before operation. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  14. 14. BTS3900 GSM Site Preparation Guidelines 1 Safety Information Device Safety l Before operation, the device must be secured on the floor or other fixed objects, such as the walls and the mounting racks. l Do not block ventilation openings while the system is running. l When installing the panel, tighten the screw with the tool. 1.2 Electricity Safety High Voltage DANGER l The high voltage power supply provides power for running the system. Direct contact with the high voltage power supply or contact through damp objects may result in fatal danger. l Non-standard and improper high voltage operations may result in fire and electric shock. l The personnel who install the AC facility must be qualified to perform operations on high voltage and AC power supply facilities. l When installing the AC power supply facility, follow the local safety regulations. l When operating the AC power supply facility, follow the local safety regulations. l When operating the high voltage and AC power supply facilities, use the specific tools instead of common tools. l When the operation is performed in a damp environment, ensure that water is kept off the device. If the cabinet is damp or wet, shut down the power supply immediately. Thunderstorm The following requirements are suitable only for the wireless base station or the device with an antenna or GPS antenna. DANGER In a thunderstorm, do not perform operations on high voltage and AC power supply facilities or on a steel tower and mast. High Electrical Leakage CAUTION Ground the device before powering on the device. Otherwise, the personnel and device are in danger. Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 1-3
  15. 15. BTS3900 GSM Site Preparation Guidelines 1 Safety Information If the "high electrical leakage" flag is stuck to the power terminal of the device, you must ground the device before powering it on. Power Cable CAUTION Do not install and remove the power cable with a live line. 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. l Before installing or removing the power cable, turn off the power switch. l Before connecting the power cable, ensure that the power cable and label comply with the requirements of the actual installation. Fuse CAUTION To ensure that the system runs safely, when a fuse blows, replace it with a fuse of the same type and specifications. Electrostatic Discharge CAUTION 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 (LIC). In the following situations, the human body generates a static electromagnetic field: l Movement of body parts l Clothes friction l Friction between shoes and the ground l Holding plastic in hand The static electromagnetic field will remain within the human body for a long time. Before contacting the device, plug boards, circuit boards, and application specific integrated circuits (ASICs), wear a grounded ESD wrist strap. It can prevent the sensitive components from being damaged by the static electricity in the human body. Figure 1-1shows how to wear an ESD wrist strap. 1-4 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  16. 16. BTS3900 GSM Site Preparation Guidelines 1 Safety Information Figure 1-1 Wearing an ESD wrist strap 1.3 Inflammable Environment DANGER Do not place the device in the environment that has inflammable and explosive air or fog. Do not perform any operation in this environment. Any operation of the electrical device in the inflammable environment causes danger. 1.4 Battery Storage Battery DANGER Before handling the storage battery, read the safety precautions for the handling and connection of the storage battery. Incorrect operation of storage batteries may cause danger. During operation, ensure the following: l Issue 03 (2008-07-15) Prevent any short-circuit. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 1-5
  17. 17. BTS3900 GSM Site Preparation Guidelines 1 Safety Information l Prevent the electrolyte from overflowing and leakage. Electrolyte overflow may damage the device. It will corrode the metal parts and the circuit boards, and ultimately damage the device and cause short-circuit of the circuit boards. General Operations Before installing and maintaining the storage battery, ensure the following: l Use special insulation tools. l Use eye protection devices and operate with care. l Wear rubber gloves and an apron in case of an electrolyte overflow. l Always keep the battery upright when moving. Do not place the battery upside down or tilt it. Short-Circuit DANGER Short-circuit of the battery may cause injury. Although the voltage of a battery is low, high transient current generated by short-circuit will release a surge of power. Keep metal objects away from the battery to prevent short circuit. If they have to be used, disconnect the battery in use before performing any other operation. Harmful Gas CAUTION l Do not use unsealed lead-acid storage batteries, because the gas emitted from it may result in fire or device corrosion. l Lay the storage battery horizontally and fix it properly. The lead-acid storage battery in use will emit flammable gas. Therefore, store it in a place with good ventilation and take precautions against fire. High Temperature CAUTION High temperature may result in distortion, damage, and electrolyte overflow of the battery. When the temperature of the battery exceeds 60oC, check whether there is acid overflow. If acid overflow occurs, handle the acid immediately. 1-6 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  18. 18. BTS3900 GSM Site Preparation Guidelines 1 Safety Information Acid CAUTION If the acid overflows, it should be absorbed and neutralized immediately. When handling a leaky battery, protect against the possible damage caused by the acid. Use the following materials to absorb and neutralize acid spills: l Sodium bicarbonate (baking soda): NaHCO3 l Sodium carbonate (soda): Na2CO3 Antacids must be used according to the instructions provided by the battery manufacturer. Lithium Battery CAUTION There is danger of explosion if the battery is incorrectly replaced. l Replace the lithium battery with the same or equivalent type recommended by the manufacturer. l Dispose of the used battery according to the instructions provided by the manufacturer. l Do not dispose of the lithium battery in fire. 1.5 Radiation Electromagnetic Field Exposure CAUTION High power radio-frequency signals are harmful to human body. Before installing or maintaining an antenna on a steel tower or mast with a large number of transmitter antennas, the operator should coordinate with all parties to ensure that the transmitter antennas are shut down. The base transceiver station (BTS) has RF radiation (radiation hazard). Suggestions for the installation and operation of BTSs are given in the following section. Operators are also required to comply with the related local regulations on erecting BTSs. l Issue 03 (2008-07-15) The antenna should be located in an area that is inaccessible to the public where the RF radiation exceeds the stipulated value. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 1-7
  19. 19. BTS3900 GSM Site Preparation Guidelines 1 Safety Information l If the areas where RF radiation exceeds the stipulated value are accessible to workers, ensure that workers know where these areas are. They can shut down the transmitters before entering these areas. Such areas may not exist; but if they exist, the areas must be within a range of less than 10 m around the antennas. l Each forbidden zone should be indicated by a physical barrier and striking sign to warn the public or workers. Laser CAUTION When handling optical fibers, do not stand close to, or look into the optical fiber outlet with unaided eyes. Laser transceivers or transmitters are used in the optical transmission system and associated test tools. Because the laser that is transmitted through the optical fiber produces a small beam of light, it has a very high power density and is invisible to human eyes. If a beam of light enters the eye, the retina may be damaged. Normally, staring into the end of an unterminated optical fiber or broken optical fiber with the unaided eyes from a distance of more than 150 mm [5.91 in.] will not cause eye injury. Eyes may, however, be damaged if an optical tool such as a microscope, magnifying glass or eye loupe is used to stare into the bare optical fiber end. Read the following guidelines to prevent laser radiation: l Only the trained and authorized personnel can perform the operation. l Wear a pair of eye-protective glasses when you are handling lasers or optical fibers. l Ensure that the optical source is switched off before disconnecting optical fiber connectors. l Never look into the end of an exposed optical fiber or an open connector if you cannot ensure that the optical source is switched off. l To ensure that the optical source is switched off, use an optical power meter. l Before opening the front door of an optical transmission system, ensure that you are not exposed to laser radiation. l Never use an optical tool such as a microscope, a magnifying glass, or an eye loupe to look into the optical fiber connector or end. Read the following instructions before handling optical fibers: l l 1-8 Only the trained personnel can cut and splice optical fibers. Before cutting or splicing an optical fiber, ensure that the optical fiber is disconnected from the optical source. After disconnecting the optical fiber, use protecting caps to protect all the optical connectors. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  20. 20. BTS3900 GSM Site Preparation Guidelines 1 Safety Information 1.6 Working at Heights CAUTION When working at heights, ensure that the objects do not fall. When working at heights, ensure that the following requirements must be met: l The personnel who work at heights must be trained. l The operating machines and tools should be carried and handled safely to prevent them from falling. l Safety measures, such as wearing a helmet and a safety belt, should be taken. l In cold regions, warm clothes should be worn before working at heights. l Ensure that the lifting appliances are well prepared for working at heights. Lifting Weights CAUTION Do not access the areas under the arm of the crane and the goods in suspension when lifting weights. l Ensure that the operators have been trained and qualified. l Check the weight lifting tools and ensure that they are intact. l Lift the weight only when the weight lifting tools are firmly mounted onto the weightbearing object or the wall. l Use a concise instruction to prevent incorrect operation. l The angle between the two cables should be less than or equal to 90o in the lifting of weights (See Figure 1-2). Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 1-9
  21. 21. BTS3900 GSM Site Preparation Guidelines 1 Safety Information Figure 1-2 Lifting a weight Safety Guide on Ladder Use Checking the Ladder l Check the ladder before using it. Check the maximum weight that the ladder can support. l Never overload the ladder. Placing the Ladder l The slant angle is preferred to be 75o. The slant can be measured with the angle square or with arms, as shown in Figure 1-3. When using a ladder, place the wider end of the ladder on the ground and take protective measures on the base of the ladder against slippage. Place the ladder on a stable ground. When climbing the ladder, ensure the following: l The gravity of the body does not shift from the edge of the ladder. l Keep balance on the ladder before performing any operation. l Do not climb higher than the fourth highest step of the ladder. If you tend to climb to the roof, the length of the ladder should be at least one meter higher than the eave, as shown in Figure 1-4. 1-10 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  22. 22. BTS3900 GSM Site Preparation Guidelines 1 Safety Information Figure 1-3 Slant angle Figure 1-4 One meter higher than the eave 1.7 Mechanical Safety Drilling CAUTION Do not drill on the cabinet without permission. Inappropriate drilling on the cabinet may damage the electromagnetic shielding and internal cables. Metal shavings from the drilling may result in a short-circuit of the circuit board if they get into the cabinet. l Issue 03 (2008-07-15) Before drilling a hole on the cabinet, remove the cables from the cabinet. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 1-11
  23. 23. BTS3900 GSM Site Preparation Guidelines 1 Safety Information l During the drilling, wear blinkers to protect your eyes. l During the drilling, wear the protective gloves. l Prevent the metal shavings from getting into the cabinet. After drilling, clean the metal shavings in time. Handling Sharp Objects CAUTION When carrying the device by hand, wear the protective gloves to prevent injury by sharp objects. Handling Fans l When replacing a component, place the component, screw, and tool at a safe place to prevent them from falling into the running fan. l 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. Moving Heavy Objects Wear the protective gloves when moving heavy objects. CAUTION l Be careful when moving heavy objects. l When moving the chassis outwards, be aware about the unfixed or heavy objects on the chassis to prevent injury. l Two persons should be available to move a chassis; one person must not move a heavy chassis. When moving a chassis, keep your back straight and move stably to prevent a sprain. l When moving or lifting a chassis, hold the handle or bottom of the chassis. Do not hold the handle of the installed modules in the chassis, such as the power module, fan module, or board. 1.8 Others Inserting and Removing a Board CAUTION When inserting a board, wear the ESD wrist strap or gloves. Insert the board gently to prevent any bent pins on the backplane. 1-12 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  24. 24. BTS3900 GSM Site Preparation Guidelines 1 Safety Information l Insert the board along the guide rail. l Avoid contact of one board with another to prevent short-circuit or damage. l Do not remove the active board before powering off. l When holding a board in hand, do not touch the board circuit, components, connectors, or connection slots. Bundling Signal Cables CAUTION Bundle the signal cables separately from the strong current cables or high voltage cables. 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: l When installing cables, ensure that the environment temperature is above 0oC. l If cables are stored in the place below 0oC, move the cables into a place at a room temperature and store the cables for more than 24 hours before installation. l Move the cables with care, especially at a low temperature. Do not drop the cables directly from the vehicle. Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 1-13
  25. 25. BTS3900 GSM Site Preparation Guidelines 2 2 Requirements for the Equipment Room Requirements for the Equipment Room About This Chapter Planning the installation space in compliance with site requirements is essential for installing, commissioning, and stable running of the BTS3900. The requirements for the equipment room involve site selection, space and position, construction, and operating environment. 2.1 Site Selection Requirements for the BTS3900 This describes the requirements for site selection. To ensure constantly stable running of the BTS3900, you should select a proper site. Site selection is subject to the technical requirements for network planning and telecommunication equipment. In addition, hydrographic, geological, and transportation factors must be considered. 2.2 Space and Location Requirements of the BTS3900 The layout of the equipment room must be reasonable, feasible, and neat. The BTS3900 cabinet can be installed against the wall. 2.3 Construction Requirements for the Equipment Room The equipment room consists of exchange room, control room (area not less than 20 m2), and auxiliary room. The exchange and control rooms can be combined as one room if the environment is not satisfactory. Factors such as the shortest route of the feeders, bearing capacity of the equipment room, power supply, and transmission mode should be taken into consideration. 2.4 Environment Requirements for Operating the BTS3900 This describes the environment requirements for operating the BTS3900. It focuses on the climatic, biological, air purity, and mechanical stress requirements for operating the BTS3900. Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 2-1
  26. 26. 2 Requirements for the Equipment Room BTS3900 GSM Site Preparation Guidelines 2.1 Site Selection Requirements for the BTS3900 This describes the requirements for site selection. To ensure constantly stable running of the BTS3900, you should select a proper site. Site selection is subject to the technical requirements for network planning and telecommunication equipment. In addition, hydrographic, geological, and transportation factors must be considered. Requirements for site selection are as follows: l The site environment should be free from dust, harmful gas, excessive heat, explosive substance, or low air pressure. l The site should be located at a place where earthquakes or loud noise are unlikely to occur. l The site should be located far from a power substation. l The site should be located away from stagnant water. l The site should be far from high-power radio transmitters, radar stations, or other interference sources. The interference field intensity should not be higher than the shielding specifications of the BTS for useless radiation. l Air inlets of the telecommunication equipment should be placed far away from the sewer pipe, septic tank, or sewage disposal pool. The equipment is in positive pressure state and is free from corrosive gas. Otherwise, electronic components and circuit boards may corrode. l The equipment room must not be constructed either in a room for feeding poultry or in an unused chemical fertilizer warehouse. The site should be kept away from a pasture or poultry yard. If the site has to be constructed near a pasture or poultry yard, the site should be constructed in the upwind direction of a pasture or poultry yard. l The equipment room should be located on the second floor or higher. If this requirement cannot be met, the ground for the equipment room must be at least 600 mm higher than the maximum local flood line. 2.2 Space and Location Requirements of the BTS3900 The layout of the equipment room must be reasonable, feasible, and neat. The BTS3900 cabinet can be installed against the wall. Space Requirements Figure 2-1 shows the space requirements of the BTS3900 cabinet. 2-2 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  27. 27. BTS3900 GSM Site Preparation Guidelines 2 Requirements for the Equipment Room Figure 2-1 Space requirements of the BTS3900 cabinet (unit: mm) The space requirements of the BTS3900 cabinet are described as follows: l If the floor of the equipment room is made of precast slabs, do not install multiple cabinets on one slab, as shown in Figure 2-2. Figure 2-2 Installation directions of the cabinets 1 3 2 1 (1) Cabinet (2) Direction of the precast slab (3) Precast slab l The rear of the cabinet is in close contact with the wall. l The lateral side of the cabinet can be in close contact with the wall. l Huawei recommends that at least 800 mm width in front of the cabinet be reserved for maintenance. Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 2-3
  28. 28. BTS3900 GSM Site Preparation Guidelines 2 Requirements for the Equipment Room l For a single cabinet, a minimum space of 200 mm should be reserved above the top of the cabinet for the feeder cabling. l For stacked cabinets, a minimum space of 200 mm should be reserved above the top of the upper cabinet for the feeder cabling. Location Requirements Figure 2-3 shows the location requirements of the BTS3900 cabinet. Figure 2-3 Location requirements of the BTS3900 cabinet (unit: mm) BTS3900 BTS3900 BTS3900 BTS3900 BTS3900 BTS3900 800 feeder window The location requirements of the BTS3900 cabinet are described as follows: l The cabinet must be installed as close as possible to the feeder window to reduce the length of the feeder. l If the BSC, BTS, and power distribution frame (PDF) are installed in one equipment room, they should be installed in one row for easy cabling. l When the cabinet is installed side by side with other equipment, no space is required between them. 2.3 Construction Requirements for the Equipment Room The equipment room consists of exchange room, control room (area not less than 20 m2), and auxiliary room. The exchange and control rooms can be combined as one room if the environment is not satisfactory. Factors such as the shortest route of the feeders, bearing capacity of the equipment room, power supply, and transmission mode should be taken into consideration. Requirements for the Area of the Equipment Room l l The feeder window can be installed easily, and the routing of the feeders inside the equipment room is convenient. l 2-4 The room should be large enough for equipment installation and future capacity expansion. It is convenient and easy for the maintenance personnel to install or maintain the equipment. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  29. 29. BTS3900 GSM Site Preparation Guidelines l 2 Requirements for the Equipment Room It is convenient to open and close the cabinet door. Requirements for the Height of the Equipment Room The minimum height of the equipment room refers to the distance between the horizontal beam or the air vent and the floor. For easy installation of the cable racks and routing of cables and conduits, the minimum height of the equipment room should be three meters. Requirements for the Bearing Capacity Because the equipment is quite heavy, architectural and structural engineers should be invited to check the bearing capacity of the room before the equipment installation. The checking should be done in compliance with the weight, basal area, position for the equipment, and structure of the building. If the bearing capacity is not enough, reinforce the building. Requirements for the Floor l Floorboards should be laid down firmly, and there should be no space between the boards. The horizontal error per square meter should not be greater than 2 mm. l Cable holes in the floor should be capped with access covers to protect cables from rodents (such as rats). Position for the holes should be determined in compliance with the engineering design and the dimensions should be accurate to ensure easy installation. Requirements for the Door and Windows l The minimum dimensions of the door are 2 meters in height and 1 meter in width. l The door and the windows should be sealed with dustproof plastic tapes. l Reflectors or colored glass should be applied to the windows through which sunlight directly enters the room. Some windows can be blocked if the light in the room is sufficient. Requirements for Walls and Rooftop l The walls and the rooftop should be durable, heat-resistant and leakproof. l Leakage-proof measures should be taken if there are antenna poles or holes in the rooftop. The bearing capacity of the devices should also be taken into consideration. l Flat paint can be applied to the walls, but chalked paint is not recommended. Requirements for Dust Proofing in the Equipment Room Table 2-1 lists the requirements for the dust concentration in the equipment room. Table 2-1 Requirements for the dust concentration in the equipment room Maximum Diameter (μm) 3 5 10 Concentration (granule/m3) Issue 03 (2008-07-15) 1 ≤ 4 x 107 ≤ 7 x 105 ≤ 2.4 x 105 ≤ 1.3 x 105 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 2-5
  30. 30. BTS3900 GSM Site Preparation Guidelines 2 Requirements for the Equipment Room Requirements for the Quake Proofing of the Equipment Room The intensity requirement of the shockproof design of the equipment room must be one degree higher than the local intensity requirement. If the equipment room does not meet this requirement, reinforce the equipment room. 2.4 Environment Requirements for Operating the BTS3900 This describes the environment requirements for operating the BTS3900. It focuses on the climatic, biological, air purity, and mechanical stress requirements for operating the BTS3900. Climatic Requirements Table 2-2 lists the climatic requirements for the normal operation of the BTS. Table 2-2 Climatic requirements Item Specification Temperature -20℃ to +50℃ (long-term operating environment) +50℃ to +55℃ (short-term operating environment) Temperature variation rate ≤ 3 ℃/min Relative humidity 5% to 95% Altitude l The BTS operates normally when the altitude ranges from -60 m to 3,000 m. l When the altitude ranges from 3,000 m to 4,000 m, the operating temperature of the BTS drops by 1ºC each time the altitude increases by 200 m. Air pressure 70 kPa to 106 kPa Solar radiation ≤ 1120 W/s2 Solar radiation ≤ 600 W/s2 Wind speed ≤ 50 m/s NOTE l In the long-term operating environment, the BTS can operate properly for a long period. In the shortterm operating environment, the BTS must operate for less than 96 hours each time and less than 15 days each year in total to ensure proper operation without damaging the hardware. l The heat consumption of the DRFU should be smaller than 355 W. Biological Environment Requirements The biological requirements related to the operating environment are as follows: 2-6 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  31. 31. BTS3900 GSM Site Preparation Guidelines 2 Requirements for the Equipment Room l The environment should not be conducive for the growth of fungus or mildew. l There should be no rodents, such as rats. Air Purity Requirements The air purity requirements related to the operating environment are as follows: l The air should be free from explosive, conductive, magneto-conductive, or corrosive dust. l The density of chemically active substances should comply with the requirements listed in Table 2-3. Table 2-3 Requirements for the density of chemically active substances Chemically Active Substance Unit Density SO2 mg/m3 ≤ 0.30 H2S mg/m3 ≤ 0.10 NH3 mg/m3 ≤ 1.00 Cl2 mg/m3 ≤ 0.10 HCl mg/m3 ≤ 0.10 HF mg/m3 ≤ 0.01 O3 mg/m3 ≤ 0.05 NOx mg/m3 ≤ 0.05 Mechanical Stress Requirements Table 2-4 lists the mechanical stress requirements for the normal operation of the BTS. Table 2-4 Mechanical stress requirements Item Sub Item Specification Sinusoidal vibration Offset ≤ 3 mm None Acceleration speed None ≤ 10.0 m/s2 Frequency range 2-9 Hz 9-200 Hz Impact response spectrum II ≤ 250 m/s2 Unsteady impact Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 2-7
  32. 32. BTS3900 GSM Site Preparation Guidelines 2 Requirements for the Equipment Room Item Sub Item Specification Static payload 0 NOTE l l 2-8 Impact response spectrum refers to the maximum acceleration response curve generated by the equipment under specified impact excitation. Impact response spectrum II means that the duration of semi-sine impact response spectrum is 6 ms. Static payload refers to the capability of the equipment in package to bear the pressure from the top in normal pile-up method. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  33. 33. BTS3900 GSM Site Preparation Guidelines 3 3 Power Supply Requirements for the BTS3900 Power Supply Requirements for the BTS3900 To ensure proper operation of the BTS3900 power system, parameters of the power input must meet corresponding specifications. Requirements for the DC Supply When the BTS uses the -48 V DC or +24 V DC supply, the power supply system must meet the following requirements: l DC input – – Voltage range for the +24 V DC: +21 V DC to +29 V DC – The on/off overshoot amplitude is not greater than ±5% of the DC output voltage. – The peak-to-peak noise voltage is smaller than or equal to 200 mV. – l Voltage range for the -48 V DC: -38.4 V DC to -60 V DC Dynamic response: The restore time is less than 200 ms. The overshoot value is less than or equal to ±5% of the DC output voltage. DC supply system – – To shorten the DC feeder, place the power equipment close to the telecommunications equipment. To reduce power consumption and installation cost, ensure that the voltage drop of the loop between the battery port and the port on the equipment is less than 3.2 V. – For the office with large traffic volume, configure multiple power supply systems in different floors. The power supply systems are used for different equipment rooms. – For the office with medium traffic volume, configure a centralized power room or battery room, or adopt the distributed power supply mode. For the office with small traffic volume, use the integrated power supply. Note that you should prevent the corrosive gas released by the battery from eroding the board. – Issue 03 (2008-07-15) When designing the capacity of the DC power supply system, you should consider the maximum load of the system in dynamic and static modes. In addition, reserve the remaining system resource. The power supply in dispersed mode is preferred. Use multiple DC power supply systems and place power equipment in multiple positions. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-1
  34. 34. 3 Power Supply Requirements for the BTS3900 BTS3900 GSM Site Preparation Guidelines – – l Use the standard DC power supply system, and set the output voltage of the power system within the required range. Improve the reliability of the AC power supply system, and reduce storage batteries. For small offices, add batteries if it is difficult to enhance the reliability of the AC power supply system. High frequency switch rectifier The total capacity of the high frequency switch rectifier should meet the power specifications of the communication loading and battery charging. Configure the backup rectifier modules. If there are less than 10 active modules, configure one backup module. If there are more than 10 active modules, configure one backup module for every 10 active modules. l Storage battery Install the storage batteries in two or more groups. The capacity is determined by the duration when the storage batteries supply power to the load. The following lists recommended duration when the storage batteries supply power to the load for most offices. The duration is specified with the allowable power failure considered. – The backup duration for Class 1 mains ranges from 0.5 to 1 hour. – The backup duration for Class 2 mains ranges from 1 to 2 hours. – The backup duration for Class 3 mains ranges from 2 to 3 hours. – The backup duration for Class 4 mains is divided into two scenarios: – – – –If there is only one power input with frequent power failures, the backup duration ranges from 8 to 10 hours. –If there are seasonal power failures or unavailable mains that occupy a long time, the backup duration ranges from 20 to 24 hours. In the unmanned site, the following factors must be considered for the storage batteries: – –Time cost on preparations for rectifying the power failure – –Time cost on driving at an average speed from the location of maintainer to the unmanned site – –Time cost on rectifying the power failure – –No maintainer available at night for rectifying the fault at unmanned sites on top of maintains or at suburbs – –For the site equipped with the generator which can be started at a delayed time, the storage batteries should discharge power less than or equal to 20% of total capacity within the delayed period. Requirements for the AC Supply l l When determining the AC power distribution capacity in the equipment room, you should consider the working current and fault current of the equipment. Each equipment must have an independent AC distribution protection device. The current threshold of the distribution protection switch for the equipment must be greater than that for the lower-level equipment. l 3-2 Use independent power network of good power supply quality. If the voltage stability does not meet the requirement, you should use voltage regulators to guarantee the voltage range. The voltage regulator should be used in either of the following two scenarios: Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  35. 35. BTS3900 GSM Site Preparation Guidelines 3 Power Supply Requirements for the BTS3900 – When the equipment is powered directly by the mains, the power supply voltage exceeds the rated voltage by –10% to +15% or the voltage range allowed for the equipment. – When the equipment is not powered directly by the mains, the mains voltage exceeds the rated voltage by –10% to +15% or the AC input voltage range allowed for the DC equipment. l To ensure stable power supply, you should use the UPS or the inverter. l Configure the generator set for the office to ensure normal communication in case of mains failure. The capacity of the generator set should be at least 1.5–2 times greater than the capacity of the AC continuous power supply equipment. l For details on the AC voltage and its allowable range, refer to Table 3-1. Table 3-1 AC voltage and allowable range Input Voltage Range Voltage Distortion 90%–110% of the nominal value Issue 03 (2008-07-15) Frequency 98%–102% of the nominal value Total harmonious components are less than 10%. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-3
  36. 36. BTS3900 GSM Site Preparation Guidelines 4 4 Requirements for Lightning Protection and Grounding System of the BTS3900 Requirements for Lightning Protection and Grounding System of the BTS3900 To ensure smooth operation of the BTS3900, the lightning protection and grounding system must meet the specified requirements. Requirements for Lightning Protection of the Equipment Room l The reinforced concrete structure should be applied to the construction of the equipment room. l The lightning protection device must be installed in the equipment room. l The lightning protection grounding should share the same grounding body with the protection grounding of the equipment room. Requirements for Lightning Protection of the AC Supply System l The TN-S should be used as the AC power supply. l A dedicated power transformer must be used for the equipment room. Power cables must be covered with the metal jacket or insulation jacket, led through with the steel pipe, buried in the ground, and then routed to the equipment room. Both ends of the metal jacket or the steel pipe should be properly grounded nearby. The power cables that are buried in the ground must be at least 15 m long. l A seamless zinc oxide lightning arrester must be installed at the low voltage side of the AC power transformer for the BTS. Ground nearby and properly the enclosure of the transformer, the neutral lines at the low voltage side, and the metal jacket for the power cables connected to the enclosure of the transformer. Requirements for Lightning Protection of Led-In Power Cables l Lightning arresters must be installed for the power cables. l The AC/DC power cables must be not led in to or out of the equipment room in overhead mode. l After the low-voltage power cables are led into the equipment room, the lightning arrester for the power cables must be installed in the AC voltage regulator and the AC power distribution panel (box). The nominal discharging current of the lightning arrester must be greater than 20 kA, and the arrester must be grounded nearby and properly. Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 4-1
  37. 37. 4 Requirements for Lightning Protection and Grounding System of the BTS3900 BTS3900 GSM Site Preparation Guidelines l In urban areas, the nominal discharging current of the lightning arrester must be greater than 20 kA. l In suburbs with average thunderstorm days, the nominal through-current capacity of the lightning arrester must be greater than 40 kA. l In mountain areas where lightning strikes are frequent or in standalone high buildings, the nominal surge through-current capacity of the surge protector must be greater than 100 kA. l The grounding cable of the lightning arrester must be less than 1 m in length. Requirements for the Lightning Rod The antenna of the BTS must be protected by the lightning rod. If the lightning rod is installed on the building (especially on the rooftop) where the BTS is located, and the BTS antenna is in the protection coverage of the lightning rod, the pole of the BTS antenna need not be installed with a lightning rod. General Requirements for Grounding l The neutral line of the AC power cable must not be connected to the protection ground of any exchange or communications devices. l All grounding cables must be as short and straight as possible. The grounding cables cannot be twisted. l Fuses or switches cannot be installed on grounding cables. l The grounding busbar should not be oxidized. Oxidation may cause bad contact between the grounding cables and the grounding bar, and thus increasing the resistance. Ensure that the grounding cables are securely connected to the protection grounding bar of the equipment room. l If the galvanized steel down leads are placed 0.5 m above the ground or 0.5 m below the ground, antirust measures should be taken against heavy moisture. Requirements for Grounding of the DC Power Distribution System The positive and negative DC power cables must be connected to the DC output terminal of the AC/DC or connected to the DC power distribution panel. Requirements for Equipotential Grounding l l Protection grounding for all the equipment on a site should be finally connected to the grounding grids for the equipment room. l 4-2 All the equipment and auxiliary facilities in the equipment room must have protection grounds. The grounding grids for the equipment room, tower, and power transformer are interconnected in a multipoint manner underground. If the tower is on the roof of the equipment room and the power transformer is in the equipment room, the grounding grids of the tower and the transformer should be connected with the grounding grid of the equipment room, as shown in Figure 4-1. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  38. 38. BTS3900 GSM Site Preparation Guidelines 4 Requirements for Lightning Protection and Grounding System of the BTS3900 Figure 4-1 Grounding grids Horizontal grounding body Tower grounding grid l Vertical grounding body Equipment grounding grid Power distribution transformer grounding grid The cabling rack, steel shelf, rack or chassis, metallic air conduit, and metallic window and door must be grounded. Requirement for Grounding Resistance The grounding resistance of the BTS must be less than 10 ohms. Requirements for Cabling and Grounding of the Feeder l The feeder should be led into the equipment room through a cabling rack or under the ground. l Grounding clips should be installed for the feeder. The installation positions of grounding clips are as follows: – – A point within 1 m away from the outdoor cabling rack – A point outside the feeder window – l A point within 1 m away from the antenna Install a grounding clip for the feeder every 20 m. If the feeder along the tower is equal to or longer than 60 m, you should add a grounding clip for the feeder at the point 30 m away from the top of the tower. Both ends of a cable rack should be grounded properly. Requirements for Lightning Protection of Signal Cables l Overhead cabling must not be used. The signal cables should be routed under ground. l Signal cables led in to and out of the site must be covered with the metal jacket, or through a metal tube. l If it is difficult to route the signal cables under ground, lead the signal cables through metal tubes and ground both ends of the tubes securely. Install signal lightning arresters with large through–current capacity at the port where the signal cables are led into the equipment. The grounding cable of the lightning arrester should be as short as possible. Ground the idle lines in the cable. Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 4-3
  39. 39. BTS3900 GSM Site Preparation Guidelines 5 5 Transmission Requirements for the BTS Site Transmission Requirements for the BTS Site The transmission devices should be arranged before the site construction. The transmission requirements for the BTS3900 site consist of DDF and transmission requirements. Transmission Requirements l Transmission resources should meet the requirements for the site and extra resources should be reserved for future capacity expansion. l If the BSC and the BTS are deployed close to the Metropolitan Area Network (MAN) or backbone network, the BSC and the BTS can be directly connected to the transmission network through the E1 or SDH ports in ATM/IP mode. If the BTS is directly connected to the BSC through the E1 cable, the overhead transmission mode should be avoided. If you have to use the overhead transmission mode, the E1 cable must be coated with the metal jacket. The maximum transmission distance of the 75-ohm trunk cable is 200 meters. Additional transmission devices are required if the transmission distance is longer than 200 meters. The E1 or FE cables can be used in IP transmission mode. The IP transmission devices, such as LANSWITCH and ROUTER, are required. l If the BTS is deployed at the far end of the BSC and MAN or backbone network, and within the Line of Sight (LOS) of microwave transmission, the microwave transmission should be used. The indoor units of the microwave transmission devices are installed in the space reserved in the cabinet. l If the BTS is at the far end of the BSC and the MAN or backbone network, and is not within the LOS of microwave transmission, the xDSL transmission should be used when there are sufficient fixed lines. Huawei recommends that you install the xDSL transmission devices in the space reserved in the cabinet. DDF Requirements l The connector of the external DDF should match the E1 cable of the transmission equipment. l The DDF should be installed before the BTS is installed. l Use copper cable to connect the DDF to the grounding bar of the equipment room. Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 5-1
  40. 40. BTS3900 GSM Site Preparation Guidelines 6 6 Arranging for Auxiliary Facilities for the BTS3900 Site Arranging for Auxiliary Facilities for the BTS3900 Site About This Chapter Auxiliary facilities of the BTS3900 site consist of cable racks, cable troughs, grounding bars, and transmission devices. The auxiliary facilities should be arranged before you install the BTS3900. 6.1 Installing Cable Racks This section describes how to install the cable rack that facilitates the routing of cables. The cable racks are classified into indoor cable racks and outdoor cable racks. A cable rack consists of a cable ladder and a cable trough(s). The cable troughs, however, are optional. 6.2 Installing the Grounding Bar of the BTS This describes how to install the grounding bar of the BTS. The grounding bar for the BTS is used to connect PGND cables of the cabinet. Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 6-1
  41. 41. 6 Arranging for Auxiliary Facilities for the BTS3900 Site BTS3900 GSM Site Preparation Guidelines 6.1 Installing Cable Racks This section describes how to install the cable rack that facilitates the routing of cables. The cable racks are classified into indoor cable racks and outdoor cable racks. A cable rack consists of a cable ladder and a cable trough(s). The cable troughs, however, are optional. Context CAUTION For mounting the cable rack, an equipotential connection is required. 6.1.1 Introduction to Cable Racks For overhead cabling, a cable rack is required for cable installation in the equipment room. A cable rack consists of a cable ladder and a cable trough(s). Cable troughs, however, are optional. 6.1.2 Procedure for Installing the Cable Rack Cable racks are classified into indoor cable racks and outdoor cable racks. You must follow the related specifications when installing the cable rack. 6.1.3 Installing the Indoor Cable Rack An indoor cable rack can be installed on the ceiling, on the floor, against the wall, or on the top of the cabinet. 6.1.4 Installing the Outdoor Cable Rack An outdoor cable rack can be installed on the floor or on the wall. 6.1.5 Connecting Cable Ladders In actual installations, you may need to dock two cable ladders, to connect the cable ladders or cable troughs in a T shape, to connect the cable ladder to the wall, or to lay the cable ladder upwards or downwards. For details on how to connect the cable ladders, refer to the corresponding topic. 6.1.6 Installing the Cable Trough This topic describes how to connect and install the cable troughs. 6.1.7 Installing Accessories During the installation of the cable rack, the required accessories are the cable manager, end cover, bushing, and baffle ring. 6.1.1 Introduction to Cable Racks For overhead cabling, a cable rack is required for cable installation in the equipment room. A cable rack consists of a cable ladder and a cable trough(s). Cable troughs, however, are optional. Specifications Select the cabling troughs by observing the following rules: l 6-2 For a 200-mm wide cabling ladder, use a 200-mm wide cabling trough. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  42. 42. BTS3900 GSM Site Preparation Guidelines 6 Arranging for Auxiliary Facilities for the BTS3900 Site l For a 400-mm wide cabling ladder, use a 400-mm wide cabling trough. l For a 600-mm wide cable ladder, use a 400-mm wide cable trough and a 200-mm wide cable trough. The cable ladder is 2,500 mm long and the cable trough is 2,000 mm long. Items Table 6-1 shows the items required for mounting a cable rack. Table 6-1 Items required for mounting a cable rack Figure 6-1 Cable ladder Figure 6-3 Bracket angle Figure 6-4 Cable manager Figure 6-5 Triangular support Issue 03 (2008-07-15) Figure 6-2 U-shape connecting piece Figure 6-6 Connecting clip Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 6-3
  43. 43. BTS3900 GSM Site Preparation Guidelines 6 Arranging for Auxiliary Facilities for the BTS3900 Site Figure 6-7 Fixing clip Figure 6-8 Cable trough Figure 6-9 Movable bushing Figure 6-10 End cover Figure 6-11 Rectangular frame Figure 6-12 U-steel Figure 6-13 Over-cabinet support 6.1.2 Procedure for Installing the Cable Rack Cable racks are classified into indoor cable racks and outdoor cable racks. You must follow the related specifications when installing the cable rack. Procedure Step 1 Determine whether to install an indoor or outdoor cable rack based on the actual requirements. 6-4 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  44. 44. BTS3900 GSM Site Preparation Guidelines 6 Arranging for Auxiliary Facilities for the BTS3900 Site l If an indoor cable rack needs to be installed, go to 6.1.3 Installing the Indoor Cable Rack. l If an outdoor cable rack needs to be installed, see 6.1.4 Installing the Outdoor Cable Rack. Step 2 Connect the cable ladders. For details, go to 6.1.5 Connecting Cable Ladders. Step 3 Install the cable trough. For details, go to 6.1.6 Installing the Cable Trough. Step 4 Install the accessories. For details, see 6.1.7 Installing Accessories. ----End 6.1.3 Installing the Indoor Cable Rack An indoor cable rack can be installed on the ceiling, on the floor, against the wall, or on the top of the cabinet. Context CAUTION When you install a cable rack, ensure that the cable rack is insulated from the floor, ceiling, and wall. 6.1.3.1 Installing the Indoor Cable Rack on the Ceiling or on the Floor When the cabling rack cannot be mounted on the wall, you can install the cable rack on the ceiling or on the floor. 6.1.3.2 Installing the Indoor Cable Rack on the Wall This task describes how to install the cable rack when the cable rack is against the wall. 6.1.3.3 Installing the Indoor Cable Rack over the Cabinet When the cables are routed over the cabinet, the cable rack can be installed on the top of the cabinet. The cable trough, however, is excluded to facilitate heat dissipation. Installing the Indoor Cable Rack on the Ceiling or on the Floor When the cabling rack cannot be mounted on the wall, you can install the cable rack on the ceiling or on the floor. Context l When you install the cable rack on the ceiling, connect the suspending levers to the ceiling. l When you install the cable rack on the floor, connect the supporting levers to the floor. You can follow the same method for installing a cable rack on the ceiling as that for installing a cable rack on the floor The following part illustrates how to install a cable rack on the ceiling. Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 6-5
  45. 45. 6 Arranging for Auxiliary Facilities for the BTS3900 Site BTS3900 GSM Site Preparation Guidelines CAUTION l The spacing between two suspending levers or two supporting levers must be an integer multiple of 50 mm. When the recommended 1,250-mm spacing is used, each segment of the cable ladder is supported by two suspending levers. l For facilitating the installation of the cable trough, the suspending levers and supporting levers must be mounted on the outer side of the cable ladder. In addition, insulating pads and insulating washers must be used to insulate the cable rack from the ceiling or the floor. l When you fix the bracket angle to the ceiling or to the floor by using expansion bolts, replace the flat washers with large flat washers 8. Procedure Step 1 Based on the engineering design, determine the location of the cable rack. Step 2 Based on the location of the cable rack, determine and mark the positions for installing the suspending levers. Step 3 Use a Ф10 bit to drill holes at the marked positions. Ensure that the depth of the holes is between 60 mm and 65 mm. Step 4 Use a screwdriver to fasten the nut in the counterclockwise direction to the top of the M8 x 80 expansion bolt, and feed the bolt vertically into the hole. Hammer the expansion bolt until the tube is completely buried in the ceiling. Remove the flat washer, spring washer, and nut from the expansion bolt. Step 5 Based on the height of the cable rack and the equipment room, cut an appropriate length of the U-steel that is used as a suspending lever. If the required length exceeds 2,500 mm, you can join two U-steels together. For details on how to join two U-steels, refer to 6.1.5.1 Docking Cable Ladders. Be sure to apply paint to the surface of the cut section. Step 6 Use a M6 x 20 bolt and a M6 nut to mount the bracket angles onto both ends of the suspending lever. Step 7 Apply insulating pads to the expansion bolts, and then lead the expansion bolts through the holes on the bracket angle. Place the insulating washers, large flat washers 8, spring washers 8, and M8 nuts sequentially onto the expansion bolts, and then fasten the M8 nuts to fix the suspending lever. Step 8 Use a bolt M8 x 20 and a nut M8 to connect the cable ladder to the suspending lever. Figure 6-14 shows the cable rack installed on the ceiling. 6-6 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  46. 46. BTS3900 GSM Site Preparation Guidelines 6 Arranging for Auxiliary Facilities for the BTS3900 Site Figure 6-14 Cable rack installed on the ceiling CAUTION Use a bolt M6 x 20 to connect the bracket angle and the suspending lever. If the cable ladder is equipped with a cable trough, the bolt M6 x 20 must be as close to the top end as possible, and the spacing between the bolt and the cable ladder must be greater than 40 mm, as shown in Figure 6-14. Step 9 If there is an obstacle on the ceiling or the required support span is wide, you can use the U-steel to connect the two suspending levers and fix the U-steel perpendicular to the cable ladder, as shown in Figure 6-15. Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 6-7
  47. 47. 6 Arranging for Auxiliary Facilities for the BTS3900 Site BTS3900 GSM Site Preparation Guidelines Figure 6-15 Cable rack installed on the ceiling with an obstacle ----End Installing the Indoor Cable Rack on the Wall This task describes how to install the cable rack when the cable rack is against the wall. Context NOTE When you use a triangular support for installing the cable rack, abide by the following rules: l When you fix the triangular support to the wall, ensure that you insulate the support from the wall by using insulating pads and insulating washers. l When you use expansion bolts to fix the triangular support to the wall, ensure that you replace the flat washers of the expansion bolts with large flat washers 8. l The spacing between two adjacent triangular supports must be an integer multiple of 50 mm. Otherwise, the triangular supports cannot hold the cable ladder stably. The recommended spacing is 1,250 mm, that is, each segment of the cable ladder is supported by two triangular supports. l Two insulating pads must be installed between the wall and an upright beam of the triangular support. An insulating washer must be installed between the nut and the upright beam. Procedure Step 1 Based on the engineering design, determine the location of the cable rack. Step 2 Determine the location of the triangular support and accordingly mark the positions of the drilling holes. Ensure that each segment of the cable ladder is supported by two triangular supports and that the spacing between two adjacent triangular supports is 1,250 mm. Step 3 Use a Ф10 bit to drill holes at the marked positions. Ensure that the depth of the holes is between 60 mm and 65 mm. Step 4 Use a screwdriver to fasten the nuts in the counterclockwise direction to the top of the M8 x 80 expansion bolts, and insert the bolts vertically into the holes. Hammer the expansion bolts until the tubes are completely buried in the wall. Step 5 Remove the flat washers, spring washers, and nuts from the expansion bolts, and lead the expansion bolts through the insulating pads. 6-8 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  48. 48. BTS3900 GSM Site Preparation Guidelines 6 Arranging for Auxiliary Facilities for the BTS3900 Site Step 6 Lead the expansion bolts through the holes on the triangular support. Install in sequence the insulating washers, large flat washers 8, spring washers 8, and nuts M8. Fasten the nuts to fix the triangular support to the wall, as shown in Figure 6-16. Figure 6-16 Fixing the triangular support Step 7 Place the cable ladder on the horizontal beam of the triangular support, align the holes on the lower side of the U-steel with the holes in the horizontal beam of the triangular support, and connect the cable ladder and the triangular support by using bolts M6 x 20 and nuts M6, as shown in Figure 6-17. Figure 6-17 Fixing the cable ladder ----End Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 6-9
  49. 49. 6 Arranging for Auxiliary Facilities for the BTS3900 Site BTS3900 GSM Site Preparation Guidelines Installing the Indoor Cable Rack over the Cabinet When the cables are routed over the cabinet, the cable rack can be installed on the top of the cabinet. The cable trough, however, is excluded to facilitate heat dissipation. Prerequisite The required over-cabinet supports should be available. Procedure Step 1 Use bolts M8 × 20 to fix the supports to the top of the cabinet, as shown in Figure 6-18. Figure 6-18 Fixing the over-cabinet supports CAUTION The spacing between two adjacent triangular supports must be an integer multiple of 50 mm. Otherwise, the triangular supports cannot hold the cable ladder stably. The recommended spacing is 1,250 mm, that is, each segment of the cable ladder is supported by two triangular supports. Step 2 Use bolts M6 × 20 and nuts M6 to fix the cable ladder to the supports, as shown in Figure 6-19. 6-10 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  50. 50. BTS3900 GSM Site Preparation Guidelines 6 Arranging for Auxiliary Facilities for the BTS3900 Site Figure 6-19 Fixing the cable ladder ----End 6.1.4 Installing the Outdoor Cable Rack An outdoor cable rack can be installed on the floor or on the wall. Context CAUTION When you determine the location of the cable rack, place the rectangular frame correctly, as shown in Figure 6-20. Figure 6-20 Rectangular frame 6.1.4.1 Installing the Outdoor Cable Rack on the Floor An outdoor cable rack can be installed on the floor if the cable rack cannot be mounted on the wall. 6.1.4.2 Installing the Outdoor Cable Rack on the Wall Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 6-11
  51. 51. 6 Arranging for Auxiliary Facilities for the BTS3900 Site BTS3900 GSM Site Preparation Guidelines This task describes how to install an outdoor cable rack on the wall. Installing the Outdoor Cable Rack on the Floor An outdoor cable rack can be installed on the floor if the cable rack cannot be mounted on the wall. Procedure Step 1 Based on the engineering design, determine the location of the cable rack. Step 2 Determine the location of the rectangular frame and accordingly mark the positions of the drilling holes. Ensure that each segment of the cable ladder is supported by two rectangular frames and that the spacing between two adjacent rectangular frames is 1,250 mm. Step 3 Use a Ф10 bit to drill holes at the marked positions. Ensure that the depth of the holes is between 60 mm and 65 mm. Step 4 Use a screwdriver to fasten the nuts in the counterclockwise direction to the top of the M8 x 80 expansion bolts, and insert the bolts vertically into the holes. Hammer the expansion bolts until the tubes are completely buried in the wall. Step 5 Remove the flat washers, spring washers, and nuts from the expansion bolts, and lead the expansion bolts through the insulating pads. Step 6 Lead the expansion bolts through the holes in the rectangular frame. Add in sequence the insulating washers, large flat washers 8, spring washers 8, and nuts M8 to the expansion bolts, and then fasten the M8 nuts to fix the rectangular frame to the floor, as shown in Figure 6-21. Step 7 Place the cable ladder on the horizontal beam of the rectangular frame, align the holes on the lower side of the U-steel with the holes in the horizontal beam of the triangular support, and fix the cable ladder to the rectangular frame by using bolts M6 x 20 and nuts M6, as shown in Figure 6-21. 6-12 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  52. 52. BTS3900 GSM Site Preparation Guidelines 6 Arranging for Auxiliary Facilities for the BTS3900 Site Figure 6-21 Installing the outdoor cable rack on the floor ----End Installing the Outdoor Cable Rack on the Wall This task describes how to install an outdoor cable rack on the wall. Procedure Step 1 Based on the engineering design, determine the location of the cable rack. Step 2 Determine the location of the rectangular frame and accordingly mark the positions of the drilling holes. Ensure that each segment of the cable ladder is supported by two rectangular frames and that the spacing between two adjacent rectangular frames is 1,250 mm. Step 3 Use a Ф10 bit to drill holes at the marked positions. Ensure that the depth of the holes is between 60 mm and 65 mm. Step 4 Use a screwdriver to fasten the nuts in the counterclockwise direction to the top of the M8 x 80 expansion bolts, and insert the bolts vertically into the holes. Hammer the expansion bolts until the tubes are completely buried in the wall. Step 5 Remove the flat washers, spring washers, and nuts from the expansion bolts, and lead the expansion bolts through the insulating pads. Step 6 Lead the expansion bolts through the holes in the vertical beam of the rectangular frame. Add in sequence the insulating washers, large flat washers 8, spring washers 8, and nuts M8 to the expansion bolts, and then fasten the nuts to fix the rectangular frame to the wall. as shown in Figure 6-22. Step 7 Place the cable ladder on the horizontal beam of the rectangular frame, align the holes on the lower side of the U-steel with the holes in the horizontal beam of the triangular support, and fix Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 6-13
  53. 53. 6 Arranging for Auxiliary Facilities for the BTS3900 Site BTS3900 GSM Site Preparation Guidelines the cable ladder to the rectangular frame by using bolts M6 x 20 and nuts M6, as shown in as shown in Figure 6-22. Figure 6-22 Installing the outdoor cable rack on the wall ----End 6.1.5 Connecting Cable Ladders In actual installations, you may need to dock two cable ladders, to connect the cable ladders or cable troughs in a T shape, to connect the cable ladder to the wall, or to lay the cable ladder upwards or downwards. For details on how to connect the cable ladders, refer to the corresponding topic. 6.1.5.1 Docking Cable Ladders If a long cable ladder is required, you can use U-shape connecting pieces to connect several cable ladders together. You then need to use three grounding cables to connect every two adjacent cable ladders to ensure reliable grounding. 6.1.5.2 Connecting Cable Ladders or Cable Troughs in T Shape If both cable ladders that are connected in a T shape are installed with cable troughs, or neither of them is installed with a cable trough, the two cable ladders or cable troughs should be connected in a T shape. The method for connecting two cable ladders in a T shape is the same as that for connecting cable troughs in a T shape. This section illustrates how to connect two cable ladders in a T shape. 6.1.5.3 Connecting the Cable Ladder to the Cable Trough in T Shape If one of the two cable ladders that are connected in a T shape is installed with a cable trough but the other one is not, a cable ladder and the cable trough of the other ladder should be connected in a T shape. 6.1.5.4 Connecting the Cable Ladder to the Wall This describes how to use bracket angles, insulating pads, insulating washers, spring washers, flat washers, and expansion bolts to connect a cable ladder to the wall. 6.1.5.5 Connecting Cable Ladders on Different Planes The cable ladders on different planes can be connected by a front connection, side connection, or oblique connection, as shown in 6-14 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  54. 54. BTS3900 GSM Site Preparation Guidelines 6 Arranging for Auxiliary Facilities for the BTS3900 Site Docking Cable Ladders If a long cable ladder is required, you can use U-shape connecting pieces to connect several cable ladders together. You then need to use three grounding cables to connect every two adjacent cable ladders to ensure reliable grounding. Context NOTE If the length of the cable ladder is not an integer multiple of 2.5 m, cut off the surplus part. You then need to apply paint to the sections for rust prevention and for visual appeal. Procedure Step 1 Connect two cable ladders by using U-shape connecting pieces. Use a grounding cable to connect the first and the fourth bolts that connect the cable ladder and the U-shape connecting piece. as shown in Figure 6-23. Figure 6-23 Docking cable ladders Step 2 Use a grounding cable to connect the second or the third bolt to the corresponding bolt. as shown in Figure 6-23. ----End Connecting Cable Ladders or Cable Troughs in T Shape If both cable ladders that are connected in a T shape are installed with cable troughs, or neither of them is installed with a cable trough, the two cable ladders or cable troughs should be connected in a T shape. The method for connecting two cable ladders in a T shape is the same as that for connecting cable troughs in a T shape. This section illustrates how to connect two cable ladders in a T shape. Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 6-15
  55. 55. 6 Arranging for Auxiliary Facilities for the BTS3900 Site BTS3900 GSM Site Preparation Guidelines Procedure Use bracket angles, bolts, and nuts to connect the two cable ladders, and ensure the two ladders are on the same level, as shown in Figure 6-24. Figure 6-24 Ladders turned on the same level (no cable trough) ----End Connecting the Cable Ladder to the Cable Trough in T Shape If one of the two cable ladders that are connected in a T shape is installed with a cable trough but the other one is not, a cable ladder and the cable trough of the other ladder should be connected in a T shape. Context CAUTION Ensure that the cable ladder and the cable trough are connected at the same level. Procedure If one of the two cable ladders has a cable trough segment, use bracket angles, bolts, and nuts to connect the two cable ladders. Figure 6-25 shows how to turn two cable ladders at different levels. 6-16 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  56. 56. BTS3900 GSM Site Preparation Guidelines 6 Arranging for Auxiliary Facilities for the BTS3900 Site Figure 6-25 Turning the cable ladder at different levels ----End Connecting the Cable Ladder to the Wall This describes how to use bracket angles, insulating pads, insulating washers, spring washers, flat washers, and expansion bolts to connect a cable ladder to the wall. Procedure Step 1 Use expansion bolts M6 x 20 to connect the bracket angles to the cable ladder, as shown in ① in Figure 6-26. Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 6-17
  57. 57. 6 Arranging for Auxiliary Facilities for the BTS3900 Site BTS3900 GSM Site Preparation Guidelines Figure 6-26 Connecting the cable ladder to the wall Step 2 Use expansion bolts M8 x 80 to connect the bracket angles to the wall, as shown in ② in Figure 6-26. ----End Connecting Cable Ladders on Different Planes The cable ladders on different planes can be connected by a front connection, side connection, or oblique connection, as shown in Procedure Step 1 Choose a cable ladder of corresponding length and use it as a climbing ladder. Step 2 Use bracket angles, bolts, and nuts to connect the climbing ladder and the cable ladder. The cable ladders on different planes can be connected by a front connection, side connection, or oblique connection, as shown in Figure 6-27, Figure 6-28, and Figure 6-29. 6-18 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  58. 58. BTS3900 GSM Site Preparation Guidelines 6 Arranging for Auxiliary Facilities for the BTS3900 Site Figure 6-27 Front connection of cable ladders Figure 6-28 Side connection of cable ladders Issue 03 (2008-07-15) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 6-19
  59. 59. 6 Arranging for Auxiliary Facilities for the BTS3900 Site BTS3900 GSM Site Preparation Guidelines Figure 6-29 Oblique connection of cable ladders ----End 6.1.6 Installing the Cable Trough This topic describes how to connect and install the cable troughs. Context Troughs can be 200-mm or 400-mm wide. Thus, the cable troughs can be installed on the following: l 200-mm or 400-mm wide cable ladders l 600-mm wide cable ladders 6.1.6.1 Connecting the Cable Troughs If a long cable trough is required, you should connect cable troughs first and then install them. 6.1.6.2 Installing the Cable Trough on the Cable Ladder This section describes how to install a cable trough onto the cable ladder. The cable ladder can be 200-mm, 400-mm, or 600-mm wide. 6.1.6.3 Installing the Sloping Cable Trough This task describes how to install a sloping cable trough. Connecting the Cable Troughs If a long cable trough is required, you should connect cable troughs first and then install them. Procedure As the cable troughs taper, you can connect two cable troughs by inserting the thinner end of a cable trough into the thicker end of the other one, as shown in Figure 6-30. The length of the inserted part must not exceed 250 mm. 6-20 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 03 (2008-07-15)
  60. 60. BTS3900 GSM Site Preparation Guidelines 6 Arranging for Auxiliary Facilities for the BTS3900 Site Figure 6-30 Connecting cable troughs ----End Installing the Cable Trough on the Cable Ladder This section describes how to install a cable trough onto the cable ladder. The cable ladder can be 200-mm, 400-mm, or 600-mm wide. Prerequisite The cable ladder should be installed. Procedure l Install a cable trough onto the 200-mm or 400-mm wide cable ladder. 1. Based on the width of the cable ladder, choose a cable trough of the same width. 2. Place the cable trough on the cable ladder. 3. Fix the cable trough to the cable ladder by using fixing clips. A combined cable trough requires four clips, two on each side. The clips on both sides are laid symmetrically. Figure 6-31 shows how to join and install the cable troughs. Figure 6-31 Installing a cable trough on the 200-mm or 400-mm wide cable ladder l Issue 03 (2008-07-15) Install the cable troughs on the 600-mm wide cable ladder. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 6-21

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