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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: [email protected]

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

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Contents

About This Document.....................................................................................................................1

1 Safety Information.....................................................................................................................1-1

1.1 Safety Precautions...........................................................................................................................................1-1

1.2 Electricity Safety.............................................................................................................................................1-31.3 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 Site Requirements of the DBS3900.........................................................................................2-1

2.1 Site Selection Requirements of the NodeB.....................................................................................................2-2

2.2 Requirements of the DBS3900 for Installation Space....................................................................................2-22.2.1 Space Requirements of the BBU3900....................................................................................................2-3

2.2.2 Space Requirements of the RRU and SRXU.........................................................................................2-4

2.2.3 Space Requirements of the SLPU..........................................................................................................2-8

2.3 Construction Requirements of the BBU3900 Equipment Room..................................................................2-10

2.4 Requirements for the Tower Where the RRU is Installed.............................................................................2-12

2.5 Working Environment Requirements of the DBS3900.................................................................................2-13

3 Power Supply Requirements of the DBS3900......................................................................3-1

4 Grounding Requirements of the DBS3900............................................................................4-1

5 Transmission Requirements of the NodeB Site...................................................................5-1

6 Preparing Auxiliary Facilities for the DBS3900 Site...........................................................6-1

6.1 Installing the Cable Rack................................................................................................................................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 Outdoor Cable Rack.........................................................................................................6-4

6.1.4 Connecting Cable Ladders.....................................................................................................................6-7

6.1.5 Installing the Cable Trough..................................................................................................................6-13

6.1.6 Installing Accessories...........................................................................................................................6-17

6.2 Installing the Grounding Bar of the NodeB..................................................................................................6-19

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6.3 Preparing the Metal Pole...............................................................................................................................6-21

7 Preparing Auxiliary Facilities for the DBS3900 Antenna System.................................... 7-1

7.1 Requirements for the Tower............................................................................................................................7-2

7.2 Installing the Antenna Support on the Tower.................................................................................................7-37.3 Installing the Antenna Support on the Rooftop...............................................................................................7-5

8 Requirements for NodeB Cables.............................................................................................8-1

8.1 Requirements for the Materials of the Outdoor NodeB Cables......................................................................8-2

8.2 Cabling Specifications for the NodeB.............................................................................................................8-2

9 Checklist for the DBS3900 Site Preparation......................................................................... 9-1

Index.................................................................................................................................................i-1

Contents

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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 BBU3900 in the 19-inch cabinet (unit: mm)...........................................2-3

Figure 2-2 Space requirements of the BBU3900 on the wall (unit: mm)............................................................2-4

Figure 2-3 Recommended space requirements of one RRU with and without the SRXU (unit: mm)................2-5

Figure 2-4 Minimal space requirements of one RRU with and without the SRXU (unit: mm)...........................2-6

Figure 2-5 Space requirements of two combined RRUs (unit: mm)....................................................................2-6

Figure 2-6 Recommended space requirements of multiple RRUs with and without the SRXUs (unit: mm)......2-7

Figure 2-7 Minimal space requirements of multiple RRUs with and without the SRXUs (unit: mm)................2-8

Figure 2-8 Space requirements of the SLPU in the 19-inch cabinet (unit: mm)..................................................2-9

Figure 2-9 Space requirements of the SLPU on the wall (unit: mm)...................................................................2-9

Figure 6-1 Cable ladder........................................................................................................................................6-3Figure 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...........................................................................................................................................6-3

Figure 6-8 Cable trough.............................................................................. .........................................................6-3

Figure 6-9 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 Rectangular frame.............................................................................................................................6-5

Figure 6-15 Installing the outdoor cable rack on the floor...................................................................................6-6

Figure 6-16 Installing the outdoor cable rack on the wall....................................................................................6-7

Figure 6-17 Docking cable ladders......................................................................................................................6-8

Figure 6-18 Ladders turned on the same level (no cable trough).........................................................................6-9

Figure 6-19 Turning the cable ladder at different levels....................................................................................6-10

Figure 6-20 Connecting the cable ladder to the wall..........................................................................................6-11

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Figure 6-21 Front connection of cable ladders...................................................................................................6-12

Figure 6-22 Side connection of cable ladders....................................................................................................6-12

Figure 6-23 Oblique connection of cable ladders...............................................................................................6-13

Figure 6-24 Connecting cable troughs...............................................................................................................6-14

Figure 6-25 Installing a cable trough on the 200-mm or 400-mm wide cable ladder........................................6-14

Figure 6-26 Installing cable troughs onto the 600-mm wide cable ladder.........................................................6-15

Figure 6-27 Cutting off the upper side of the triangle aperture .........................................................................6-16

Figure 6-28 Installing a sloping cable trough.....................................................................................................6-16

Figure 6-29 Installed sloping cable trough ........................................................................................................6-17

Figure 6-30 Cable manager on the cable rack that is not installed with a cable trough.....................................6-18

Figure 6-31 Cable manager on the cable rack that is installed with a cable trough...........................................6-18

Figure 6-32 Installing the end cover, bushing, and baffle ring..........................................................................6-19

Figure 6-33 Grounding bar of the NodeB..........................................................................................................6-20

Figure 6-34 Installing the grounding bar............................................................................................................6-20

Figure 6-35 Profile chart for installing the grounding bar.................................................................................6-21

Figure 6-36 Installing the metal pole on the concrete floor...............................................................................6-22

Figure 6-37 Two stay poles with a metal pole...................................................................................................6-22

Figure 6-38 Base................................................................................................................................................6-23

Figure 6-39 Two metal poles with a stay pole...................................................................................................6-23

Figure 7-1 Tower for telecommunication purpose...............................................................................................7-2

Figure 7-2 Structure of the antenna support (unit: mm).......................................................................................7-4

Figure 7-3 Installing the antenna support on the tower........................................................................................7-5

Figure 7-4 Structure of the antenna support directly installed on the rooftop......................................................7-6Figure 7-5 Installing the antenna support on the parapet (height of the parapet > 1,200 mm)............................7-7

Figure 7-6 Installing the fixing clip for the antenna support on the parapet........................................................7-7

Figure 7-7 Installing the antenna support on the parapet (height of the parapet < 1,200 mm)............................7-8

Figure 7-8 Structure and installation of the antenna support base ...................................................................... 7-9

Figures

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Tables

Table 2-1 Climatic requirements........................................................................................................................2-13

Table 2-2 Requirements for the density of physically active materials..............................................................2-14

Table 2-3 Requirements for the density of chemically active materials............................................................2-14

Table 2-4 Mechanical stress requirements.........................................................................................................2-14

Table 3-1 Power supply requirements of the DBS3900.......................................................................................3-1

Table 6-1 Items required for mounting a cable rack.............................................................................................6-3

Table 8-1 Requirements for the materials of the outdoor NodeB cables.............................................................8-2

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About This Document

Purpose

Before installing the DBS3900 hardware, you need to conduct site survey to select an appropriate

site. This ensures proper operation of the DBS3900.

This document serves as a reference for conducting the DBS3900 site survey. It describes the

site requirements in terms of the site location, power supply, transmission, grounding, and

auxiliary facilities of the site and antenna system. To ensure smooth site construction, the site

requirements described in this document must be met.

Product Version

The following table lists the product version related to this document.

Product Name Product Version

DBS3900 V200R010

Intended Audience

This document is intended for NodeB installers.

Change History

For changes in the document, refer to Changes in the DBS3900 Site Preparation

Guidelines.

Organization

1 Safety Information

2 Site Requirements of the DBS3900

This describes the site requirements of the DBS3900. The proper installation, commissioning,

and operation of the DBS3900 are ensured only when the installation space is planned and

prepared in compliance with the site requirements. The site requirements of the DBS3900 consist

of the site selection, installation space, construction of the BBU3900 equipment room and thetower where the RRU is installed, and the operating environment requirements.

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3 Power Supply Requirements of the DBS3900

This describes the power supply requirements of the DBS3900. To ensure the proper operation

of the power system of the DBS3900, the power supply of all the functional modules must

comply with the related specifications.

4 Grounding Requirements of the DBS3900

Grounding requirements of the BBU3900 and RRU in the DBS3900 system must be satisfied.

5 Transmission Requirements of the NodeB Site

This describes the transmission requirements of the NodeB. The transmission devices and

auxiliary devices must be prepared before the site construction. Transmission requirements of

the NodeB site consist of the requirements for the DDF/ODF and transmission mode.

6 Preparing Auxiliary Facilities for the DBS3900 Site

This describes how to prepare the auxiliary facilities such as the cable rack, grounding bar, andmetal pole for the DBS3900 site. Before you install the DBS3900, the auxiliary facilities must

be prepared.

7 Preparing Auxiliary Facilities for the DBS3900 Antenna System

This describes how to prepare the auxiliary facilities such as the tower and antenna support for

the DBS3900 antenna system in different installation scenarios.

8 Requirements for NodeB Cables

This describes the requirements for materials and routing of the NodeB cables such as the power

cables, signal cables, and PGND cables.

9 Checklist for the DBS3900 Site Preparation

This describes how to check the NodeB site preparations. Before installing the NodeB, you need

to check the site, power supply, transmission system, grounding system, antenna system,

auxiliary facilities, and cables.

Conventions

1. Symbol Conventions

The following symbols may be found in this document. They are defined as follows

Symbol Description

DANGER

Indicates a hazard with a high level of risk that, if not avoided,

will result in death or serious injury.

WARNING

Indicates a hazard with a medium or low level of risk which, if

not avoided, could result in minor or moderate injury.

CAUTION

Indicates a potentially hazardous situation that, if not avoided,

could cause equipment damage, data loss, and performance

degradation, or unexpected results.

About This Document

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Symbol Description

TIP Indicates a tip that may help you solve a problem or save your

time.

NOTE Provides additional information to emphasize or supplement

important points of the main text.

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 userroot .

Italic Book titles are in italics.

Courier New Terminal display is in Courier New.

3. Command Conventions


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


Boldface Buttons,menus,parameters,tabs,window,and dialog titles are in

boldface. For example,clickOK.

> Multi-level menus are in boldfaceand separated by the ">" signs.

For example,choose File > Create > Folder .

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5. Keyboard Operation


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 Description

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 Press and hold the primary mouse button and move the pointer

to a certain position.

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1 Safety Information1.1 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.

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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 groundconductor.

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 To prevent electric shock, do not connect safety extra-low voltage (SELV) circuits to

telecommunication network voltage (TNV) circuits.

l To prevent laser radiation from injuring your eyes, never look into the optical fiber outlet

with unaided eyes.

l 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.


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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.

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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.


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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

DANGERBefore 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 Prevent any short-circuit.

l Prevent the electrolyte from overflowing and leakage.

Electrolyte overflow may damage the device. It will corrode the metal parts and the circuitboards, and ultimately damage the device and cause short-circuit of the circuit boards.

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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.


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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

The antenna should be located in an area that is inaccessible to the public where the RFradiation exceeds the stipulated value.

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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 thepublic 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 Only the trained personnel can cut and splice optical fibers.

l 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.


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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 weight-

bearing 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).

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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.


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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 Before drilling a hole on the cabinet, remove the cables from the cabinet.

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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 preventthem 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.


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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, orconnection 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.

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2 Site Requirements of the DBS3900About This Chapter

This describes the site requirements of the DBS3900. The proper installation, commissioning,

and operation of the DBS3900 are ensured only when the installation space is planned and

prepared in compliance with the site requirements. The site requirements of the DBS3900 consist

of the site selection, installation space, construction of the BBU3900 equipment room and the

tower where the RRU is installed, and the operating environment requirements.

2.1 Site Selection Requirements of the NodeB

This describes the site selection requirements of the NodeB. To ensure the stable running of the

NodeB overa long term, the site for the NodeB must meet the requirements fortelecommunication network planning, communications technology, hydrology, geology, and

traffic.

2.2 Requirements of the DBS3900 for Installation Space

DBS3900This describes the space requirements of the DBS3900. The space requirements of the

DBS3900 consist of the space requirements of the BBU3900, the RRU3804, and the SRXU.

2.3 Construction Requirements of the BBU3900 Equipment Room

This describes the construction requirements of the equipment room in which the BBU3900 is

installed.

2.4 Requirements for the Tower Where the RRU is Installed

This describes the requirements for the tower where the RRU is installed. To ensure the safetyof installers and equipment, the towers must meet the related construction requirements.

2.5 Working Environment Requirements of the DBS3900

This describes the working environment requirements of the DBS3900.

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2.1 Site Selection Requirements of the NodeB

This describes the site selection requirements of the NodeB. To ensure the stable running of the

NodeB over a long term, the site for the NodeB must meet the requirements for

telecommunication network planning, communications technology, hydrology, geology, and

traffic.

The selection of the NodeB site must meet the follows requirements:

l The site is not exposed to excessive heat, dust, harmful gases, flammable or explosive

materials, or unstable voltage.

l The site is not located at places that are prone to frequent earthquakes and exposed to loud

noise.

l The site is far from power transformer station, industrial boiler, and heating boiler.

l The site is located far from high-power radio transmitters, radar stations, or otherinterference sources. The interference field intensity is not higher than the shielding

specifications of the NodeB for useless radiation.

l The equipment room for the indoor NodeB is constructed at least 3.7 km away from the

seaside or a salt lake. If this requirement cannot be met, the equipment room must be

enclosed and configured with air conditioners. In addition, avoid using salt soil as the

building material for the room. Otherwise, the equipment that can withstand the adverse

weather must be configured.

l The distance between the outdoor NodeB and the sea exceeds 500 m.

l The site is away from pollution sources. If this requirement cannot be met, ensure that the

site is in the perennial upwind direction of the pollution source.

The site is at least 5 km away from heavy pollution sources such as a smelting plant or

a coal mine.

The site is at least 3.7 km away from medium pollution sources such as a chemical plant,

a rubber plant, or an electric plating plant.

The site is at least 2 km away from light pollution sources such as a food products factory

or a leather processing factory.

l The air inlets of the telecommunication equipment are far away from the sewer pipe, septic

tank, and sewage disposal pool. The equipment are in positive pressure state and free from

corrosive gas. Otherwise, electronic components and circuit boards may corrode.

l The room for feeding poultry and the chemical fertilizer warehouse cannot be used as the

equipment room for the indoor NodeB. If this requirement cannot be met, ensure that the

equipment room is constructed in the perennial upwind direction of the room for feeding

poultry or the chemical fertilizer warehouse.

l The equipment room for the indoor NodeB is preferably on the second floor or higher. If

this requirement cannot be met, ensure that the room is located at least 600 mm above the

maximum local flood level.

2.2 Requirements of the DBS3900 for Installation Space

DBS3900This describes the space requirements of the DBS3900. The space requirements of the

DBS3900 consist of the space requirements of the BBU3900, the RRU3804, and the SRXU.


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2.2.1 Space Requirements of the BBU3900

This describes the space requirements of the BBU3900. When installed in a 19-inch cabinet, the

BBU3900 has the minimal space requirements for cabling and OM. In addition, Huawei offers

the recommended space requirements.

2.2.2 Space Requirements of the RRU and SRXUIn different installation modes, the RRU and SRXU have the minimal space requirements for

cabling and OM. Based on the engineering practice, Huawei offers the recommended space

requirements.

2.2.3 Space Requirements of the SLPU

This describes the space requirements of the SLPU. When installed in a 19-inch cabinet on a

wall, the SLPU has the minimal space requirements for cabling and OM. In addition, Huawei

offers the recommended space requirements.

2.2.1 Space Requirements of the BBU3900

This describes the space requirements of the BBU3900. When installed in a 19-inch cabinet, theBBU3900 has the minimal space requirements for cabling and OM. In addition, Huawei offers

the recommended space requirements.

Space Requirements of the BBU3900 in the 19-Inch Cabinet

Figure 2-1 shows the space requirements of the BBU3900 when it needs to be installed in the

19-inch cabinet.

Figure 2-1 Space requirements of the BBU3900 in the 19-inch cabinet (unit: mm)

The minimal space around the BBU3900 is as follows:l 25 mm on both sides for ventilation

l 70 mm in front of the panel for cabling

Space Requirements of the BBU3900 on the Wall

Figure 2-2 shows the recommended space requirements when a single BBU3900 is installed on

the wall.

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Figure 2-2 Space requirements of the BBU3900 on the wall (unit: mm)

The minimal space around the BBU3900 is as follows:

l 20 mm above the equipment for maintenance

l 800 mm between the bottom and the ground for cabling and maintenance

l 50 mm on both sides for ventilation

l 600 mm in front of the equipment for maintenance

2.2.2 Space Requirements of the RRU and SRXU

In different installation modes, the RRU and SRXU have the minimal space requirements for

cabling and OM. Based on the engineering practice, Huawei offers the recommended space

requirements.

NOTE

The following figures related to the space requirements assume that the cabling cavities are on the left side

of the RRU and SRXU. If the RRU and SRXU are installed with the cabling cavities on the right, the

horizontal space requirements are opposite to what are shown in the figures.

Space Requirements of One RRU with and Without the SRXU

Figure 2-3 shows the recommended space requirements of one RRU with and without the

SRXU.


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Figure 2-3 Recommended space requirements of one RRU with and without the SRXU (unit:

mm)

The recommended space around the equipment is as follows:

l At least 500 mm under the equipment for cabling. It is recommended that the space be

1,200 mm between the bottom and the ground for easy maintenance.

l At least 800 mm in front of the equipment for maintenance.

l

At least 200 mm above the equipment for maintenance.l At least 600 mm on the left of the equipment for maintenance.

l At least 300 mm on the right of the equipment for maintenance.

l Regardless of whether the SRXU is fixed to the RRU, the space requirements are the same.

Figure 2-4 shows the minimal space requirements of one RRU with and without the SRXU.

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Figure 2-4 Minimal space requirements of one RRU with and without the SRXU (unit: mm)

The minimal space around the equipment is as follows:

l 300 mm under the equipment for cabling. It is recommended that the space be 1,200 mm

between the equipment bottom and the ground for easy maintenance.

l 600 mm in front of the equipment for maintenance.

l 200 mm above the equipment for maintenance.

l 400 mm on the left of the equipment for maintenance.

l 100 mm on the right of the equipment for maintenance.

When two RRUs need to be combined, space requirements of each RRU must be met. In addition,

the space between the two RRUs should stay within the range shown in Figure 2-5.

Figure 2-5 Space requirements of two combined RRUs (unit: mm)

The space between the two RRUs is as follows:


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l When two RRUs are installed horizontally, the space is 1,200 mm at most.

l When two RRUs are installed vertically, the space is 800 mm at most.

NOTE

The space requirements of two combined SRXUs are the same as those of two combined RRUs.

Space Requirements of Multiple RRUs with and Without the SRXUs

Figure 2-6 shows the recommended space requirements of multiple RRUs with and without the

SRXUs.

Figure 2-6 Recommended space requirements of multiple RRUs with and without the SRXUs

(unit: mm)

The recommended space around the equipment is as follows:

l At least 500 mm under the equipment for cabling. It is recommended that the space be

1,200 mm between the bottom and the ground for easy maintenance.

l At least 800 mm in front of the equipment for maintenance.

l At least 200 mm above the equipment for maintenance.

l At least 800 mm on the left of the equipment for maintenance.

l At least 800 mm on the right of the equipment for maintenance.

l Regardless of whether the SRXUs are fixed to the RRU, the space requirements are the

same.

l Regardless of whether the RRUs are in two-module or three-module centralized installation

mode, the space requirements are the same.

Figure 2-7 shows the minimal space requirements of multiple RRUs with and without the

SRXUs.

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Figure 2-7 Minimal space requirements of multiple RRUs with and without the SRXUs (unit:

mm)

The minimal space around the equipment is as follows:

l 300 mm under the equipment for cabling. It is recommended that the space be 1,200 mm

between the equipment bottom and the ground for easy maintenance.

l 600 mm in front of the equipment for maintenance.

l 200 mm above the equipment for maintenance.

l 600 mm on the left of the equipment for maintenance.

l 600 mm on the right of the equipment for maintenance.

2.2.3 Space Requirements of the SLPU

This describes the space requirements of the SLPU. When installed in a 19-inch cabinet on a

wall, the SLPU has the minimal space requirements for cabling and OM. In addition, Huawei

offers the recommended space requirements.

Space Requirements of the SLPU in the 19-Inch CabinetFigure 2-8 shows the space requirements of the SLPU when it needs to be installed in the 19-

inch cabinet.


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Figure 2-8 Space requirements of the SLPU in the 19-inch cabinet (unit: mm)

The minimal space around the SLPU is as follows:


l 70 mm in front of the panel for cabling

Space Requirements of the SLPU on the Wall

Figure 2-9 shows the space requirements of the SLPU when it needs to be installed on the wall.

Figure 2-9 Space requirements of the SLPU on the wall (unit: mm)

The minimal space around the SLPU is as follows:

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l 20 mm above the equipment for maintenance

l 800 mm between the SLPU bottom and the ground for cabling and maintenance


l 800 mm in front of the SLPU for maintenance

2.3 Construction Requirements of the BBU3900 EquipmentRoom

This describes the construction requirements of the equipment room in which the BBU3900 is

installed.

Requirements for the Area of the Equipment Room

l The equipment room is large enough for equipment installation and future capacityexpansion.

l The feeder window is installed and feeders can be routed in the room.

l Sufficient space is provided for easy installation and maintenance of the equipment.

l The cabinet door can be opened and closed conveniently.

Requirements for the Height of the Equipment Room

The height of the equipment room refers to the distance between the horizontal beam or the air

vent and the floor. The room is high enough (generally 3 m to 3.5 m) to facilitate the installation

of cable racks and the layout of cables and feeders.

Requirements for the Bearing Capacity of the Equipment Room

The equipment is heavy. Thus, the architectural and structural engineers must check the bearing

capacity of the room based on the equipment weight, footprint of the equipment, installation

position, and structure of the equipment room.

The bearing capacity of the equipment room floor is over 450 kg/m2. If the bearing capacity is

insufficient, reinforce the building to ensure a sufficient bearing capacity.

Requirements for the Floor of the Equipment Room

The floor of the equipment room is semiconductor and dustproof. Generally, the movable

Electrostatic Discharge (ESD) floorboards are used in the equipment room.

l Floorboards are laid down firmly and there is no space between the boards. The horizontal

error per square meter is within 2 mm.

l If the room does not have movable ESD floorboards, you need to use ESD floor with a

volume resistance between 1.0 x 107 ohms to 1.0 x 1010 ohms.

l The ESD floor or movable floorboards are grounded by using cables and 1-megaohm

current-limiting resistance. Tests must prove that the terrazzo floor (including the concrete

floor) can meet the requirement.


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l All cable holes in the floor are capped with cover plates. Positions for the holes are

determined in compliance with the engineering design and the dimensions are accurate to

ensure easy installation.

Requirements for the Door and Window of the Equipment Rooml The minimum dimension of the door is 2 m (height) x 1 m (width).

l The door and window are sealed with dustproof plastic tapes.

l Use reflecting paper on the windowpane or colored glass for windows that are exposed to

excessive sunlight. You may block the window if the light in the room is sufficient.

Requirements for the Walls and Rooftop of the Equipment Room

l The roof and walls are durable, well insulated, and leakproof.

l Waterproofing measures are taken if there are antenna poles or cable holes on the rooftop.

Ensure that the rooftop is strong enough to bear the weight of the equipment.

l Lusterless paint can be used on the walls. Avoid painting the walls with paint that chalks

off easily.

Shockproof Requirements of the Equipment Room

The equipment room is designed to resist one more degree of seismic intensity over the limit

stipulated in local regulations. If this requirement is not met, reinforce the equipment room until

it meets the shockproof requirements.

Requirements for ESD and EMI Performances of the Equipment Room

l The ESD floor or movable ESD floorboards are used in the equipment room and properlygrounded.

l The ESD work clothes and ESD wrist straps are provided in the equipment room.

l The density of the electric field is less than 300 mV/m. The density of the magnetic field

is less than 11 GS.

Lighting Requirements of the Equipment Room

l The equipment room is not exposed to direct sunlight. Otherwise, the circuit board and

other components of the equipment room are easily deformed.

l An anti-explosion lamp with soft lighting is installed in the room where the batteries are

located.l The unmanned equipment rooms are lit normally and powered by the mains.

l The DC power is provided as the emergency lighting for the equipment room of heavy

traffic or great importance.

Air Conditioning Requirements of the Equipment Room

The actual capacity of the air conditioner depends on the area of the equipment room and heating

values of the equipment. For details about the method of measuring the capacity, refer to

corresponding engineering design specifications.

For most NodeBs, two air conditioners are configured to work alternatively. The air conditionersettings are as follows:

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l Humidity: 30% to 75%, preferably 50% to 60%

l Temperature: 18 to 28, preferably 20 to 25

Fire Protection Requirements of the Equipment Room

l Telecommunication buildings are major fire protection units. Therefore, the NodeB

equipment room must be designed in compliance with the local fire protection regulations.

l There is no flammable, explosive substance in the equipment room.

l Fire-fighting equipment are provided in the equipment room. If there are alarm devices

such as a smoke sensor or temperature sensor, they function normally.

l Sockets of different voltages in the equipment room are clearly labeled.

l The holes left in the floor are capped with safe cover plates.

l In addition to the alarm devices such as the fire-alarm and smoke detector, the equipment

room can also be installed with the automatic fire extinguisher. This can extinguish or

control the fire in the initial stage of fire. A certain number of portable fire extinguishersare provided in the corridor outside the equipment room so that they can be used in the

initial stage of the fire.

l The fire fighting pool, if equipped in compliance with the fire fighting specifications, can

meet the water demand for both inside and outside of the equipment room during the fire,

assuming the fire lasts for two hours. The fire hydrant is placed in the corridors or stair

wells for easy accessibility.

Requirements for the Corridor of the Equipment Room

l The width of the transporting corridor is greater than 1.5 m and the height is greater than

2.5 m.

l The emergency exit is free from obstruction. The emergency exit sign is clearly visible in

the equipment room.

l The height of the elevator is greater than 2.4 m.

2.4 Requirements for the Tower Where the RRU is Installed

This describes the requirements for the tower where the RRU is installed. To ensure the safety

of installers and equipment, the towers must meet the related construction requirements.

The requirements for the tower where the RRU is installed are as follows:

l Engineering specifications of the tower comply with the requirements for communication

equipment installation.

l There is a maintenance channel on the tower with safety design. The channel is spacious

enough to hold at least one person.

l Sufficient space is provided for the RRU installation and future maintenance.

l The grounding system meets the grounding requirements of the site.

l A grounding bar for connecting the PGND cable of the RRU is installed. If the grounding

bar is not installed, sufficient space is provided for installing the grounding bar.

l A cable rack is installed for the routing of the RRU cables such as the power cables and

optical cables. If the cable rack is not installed, sufficient space is provided for installingthe rack.


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2.5 Working Environment Requirements of the DBS3900

This describes the working environment requirements of the DBS3900.

Climatic Requirements

Table 2-1 lists the climatic requirements for the working environment of the DBS3900.

Table 2-1 Climatic requirements

Item Specification

Altitude 4,000 m

Air pressure 70 kPa to 106 kPa

Temperature BBU3900: -20 to +55

RRU:

l -40 to +50 (with solar radiation)

l -40 to +55 (without solar radiation)

Relative humidity BBU3900: 5% to 85%

RRU: 5% to 100%

Absolute humidity BBU3900: 1 g/m3 to 25 g/m3

RRU: 1 g/m3 to 30 g/m3

Wind speed 67 m/s

Protection degree BBU3900: IP20

RRU: IP65

Biological Requirements

The working environment of the DBS3900 should not conducive for the growth of fungus or

mildew.

Air Cleanliness Requirements

The working environment of the DBS3900 should meet the following air cleanliness

requirements:

l There is no explosive, conductive, magneto-conductive or corrosive dust in the air.

l The density of the physically active materials meets the requirements listed in Table 2-2.

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Table 2-2 Requirements for the density of physically active materials

Physically ActiveMaterial

Unit Density

Suspended dust mg/m3 0.01

Falling dust mg/(m2h) 10

Sand mg/m3 There is no visible sand.

Note:

l Suspended dust: diameter 75 m

l Falling dust: 75 m diameter 150 m

l Sand: 150 m diameter 1,000 m

l The density of the chemically active materials meets the requirements listed in Table

2-3.

Table 2-3 Requirements for the density of chemically active materials

Chemically ActiveMaterial

Unit Density

SO2 mg/m3 1.50

NH3 mg/m3 0.15

Cl2 mg/m3 0.30

Mechanical Stress Requirements

Table 2-4 lists the mechanical stress requirements for the working environment of the

DBS3900.

Table 2-4 Mechanical stress requirements

Item Subitem Specification

Sinusoidal

vibration

(ETSI

requirements)

Offset 3.5 mm -

Acceleration - 10.0 m/s2

Frequency range 2 Hz to 9 Hz 9 Hz to 200 Hz

Sinusoidal

vibration

(GR63

requirements)

Frequency range: 5-100-5 Hz; acceleration: 1.0 x g; scanning

frequency: 0.25 oct/min; triaxial test


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Item Subitem Specification

Unsteady impact Impact response

spectrum II 100 m/s2

Static payload 0

Anti-seismic

requirements

Earthquake Frequency range: 0.3 Hz to 50 Hz

Zero Period Acceleration (ZPA): 1.5 x g

30s

Note:

l Impact response spectrum refers to the maximum acceleration response curve generated

by the equipment under the specified impact excitation. Impact response spectrum II means

that the duration of semi-sine impact response spectrum is 6 ms.

l Static payload refers to the capability of the equipment in a packing case to bear the pressure

from the top in normal pile-up method.

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3Power Supply Requirements of the DBS3900This describes the power supply requirements of the DBS3900. To ensure the proper operation

of the power system of the DBS3900, the power supply of all the functional modules must

comply with the related specifications.

Table 3-1 lists the power supply requirements of the DBS3900.

Table 3-1 Power supply requirements of the DBS3900

Functional Moduleof the DBS3900

Rated Voltage Voltage Range

BBU3900 -48 V DC -38.4 V DC to -57 V DC

RRU -48 V DC -36 V DC to -57 V DC

NOTE

If the voltage stability does not meet the requirements, you need to use voltage regulators to ensure a proper

power voltage range.

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4Grounding Requirements of the DBS3900Grounding requirements of the BBU3900 and RRU in the DBS3900 system must be satisfied.

Grounding Requirements of the BBU3900

l The green and yellow PGND cable of the BBU3900 must be copper-based and plastic-

insulated with the cross-sectional area no less than 6 mm2.

l The grounding resistance of the BBU3900 is less than 10 ohms.

l When the BBU3900 is installed in the equipment room, the PGND cable of the

BBU3900 is connected to the protection grounding bar of the equipment room.

l When the BBU3900 is installed in outdoor cabinets such as the APM30 or the APM100,

the PGND cable of the BBU3900 is connected to the grounding bar in the cabinet.

l When the BBU3900 is connected to the RRU, do not use fibers that has have strengthening

ribs.

l When the E1/T1 cable of the BBU3900 is routed out of the equipment room overhead, add

a surge protection box for the BBU3900 that is installed in the equipment room. Connect

the PGND cable of the BBU3900 to the grounding bar on the surge protection box, and

then route the PGND cable from the surge protection box to the grounding bar of the

equipment room.

l When the E1/T1 cable of the BBU3900 is routed outdoors, add a surge protection box for

the BBU3900 that is installed in an outdoor cabinet. Connect the PGND cable of the

BBU3900 to the grounding bar on the surge protection box, and then route the PGND cable

from the surge protection box to the grounding bar in the cabinet.

Grounding Requirements of the RRU

l The green and yellow PGND cable of the RRU must be copper-based and plastic-insulated

with a cross-sectional area not less than 25 mm2.

l The grounding resistance of the RRU is less than 10 ohms.

NOTE

Refer toAntenna System User Guide for the grounding requirements of the RRU, antennas, and feeders in

different scenarios.

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5 Transmission Requirements of the NodeBSite

This describes the transmission requirements of the NodeB. The transmission devices and

auxiliary devices must be prepared before the site construction. Transmission requirements of

the NodeB site consist of the requirements for the DDF/ODF and transmission mode.

Requirements for the DDF/ODF

The trunk cables and optical cables on the NodeB side are connected to the transmission device

through the DDF or ODF. The requirements for the DDF/ODF are listed as follows:

l The delivered transmission cables and connectors match the connectors on the DDF/ODF

on the transmission device side.

l Before you install the NodeB, the DDF/ODF is installed and external trunk cables or optical

cables are connected to the DDF/ODF.

l It is recommended that the copper wires be used to connect the DDF/ODF and the grounding

bar of the equipment room.

Requirements for the Transmission Mode

l Transmission resources must meet the upcoming requirements of the NodeB site and extra

resources must be reserved for capacity expansion.

l When RNCs and NodeBs are close to coverage of the Metropolitan Area Network (MAN)

or backbone network, they are directly connected to the networks through E1s or SDH

interfaces in ATM or IP transport mode. There are restrictions on the maximumtransmission distance for the trunk cables. Additional transmission devices are required if

the trunk cables are longer than the corresponding maximum transmission distance.

l If the NodeB is at the far end of the RNC and the MAN/backbone network, and is within

the Line of Sight (LOS) of microwave transmission, the microwave transmission is used.

The indoor units of the microwave transmission devices are installed in the reserved space.

l If the NodeB is at the far end of the RNC and the MAN/backbone network, and is not within

the LOS of microwave transmission, the xDSL transmission is used. It is recommended

that the devices for xDSL transmission be installed in the reserved space.

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6 Preparing Auxiliary Facilities for theDBS3900 Site

About This Chapter

This describes how to prepare the auxiliary facilities such as the cable rack, grounding bar, and

metal pole for the DBS3900 site. Before you install the DBS3900, the auxiliary facilities must

be prepared.

6.1 Installing the Cable Rack

This describes how to install the cable rack to facilitate the cable routing. The cable rack consists

of the cable ladders and cable troughs. The cable trough is optional and installed on the cableladder.

6.2 Installing the Grounding Bar of the NodeB

This describes how to install the grounding bar that is used to connect the PGND cables of the

NodeB cabinet.

6.3 Preparing the Metal Pole

This describes how to prepare the metal pole on which you can secure the RRU and APM30

when launching a site on the rooftop.

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6.1 Installing the Cable Rack

This describes how to install the cable rack to facilitate the cable routing. The cable rack consistsof the cable ladders and cable troughs. The cable trough is optional and installed on the cable

ladder.

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

This describes the procedure for installing the cable rack. The procedure for installing the cable

rack consists of installing the outdoor cable rack, connecting the cable ladders, installing the

cable troughs, and installing the accessories.

6.1.3 Installing the Outdoor Cable Rack

An outdoor cable rack can be installed on the floor or on the wall.

6.1.4 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 Installing the Cable Trough

This topic describes how to connect and install the cable troughs.

6.1.6 Installing AccessoriesDuring 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 For a 200-mm wide cabling ladder, use a 200-mm wide cabling trough.

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.


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Table 6-1 Items required for mounting a cable rack

Figure 6-1 Cable ladder Figure 6-2 U-shape connecting piece

Figure 6-3 Bracket angle Figure 6-4 Cable manager

Figure 6-5 Triangular support Figure 6-6 Connecting clip

Figure 6-7 Fixing clip Figure 6-8 Cable trough

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Figure 6-9 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

This describes the procedure for installing the cable rack. The procedure for installing the cable

rack consists of installing the outdoor cable rack, connecting the cable ladders, installing the

cable troughs, and installing the accessories.

ProcedureStep 1 6.1.3 Installing the Outdoor Cable Rack

Step 2 6.1.4 Connecting Cable Ladders

Step 3 6.1.5 Installing the Cable Trough

Step 4 6.1.6 Installing Accessories

----End

6.1.3 Installing the Outdoor Cable Rack

An outdoor cable rack can be installed on the floor or on the wall.


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Context

CAUTION

When you determine the location of the cable rack, place the rectangular frame correctly, as

shown in Figure 6-14.

Figure 6-14 Rectangular frame

6.1.3.1 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.6.1.3.2 Installing the Outdoor Cable Rack on the Wall

This topic 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 drillingholes. Ensure that each segment of the cable ladder is supported by two rectangular frame

dbs3900 site preparation guidelines(v200_01)

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