c&Rru3256(Dc) Installation Guide(05)(PDF)-En

RRU3252(DC)&RRU3256(DC)

Installation Guide

Issue 05

Date 2014-11-10

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2014. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior writtenconsent of Huawei Technologies Co., Ltd. Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.All other trademarks and trade names mentioned in this document are the property of their respective holders. NoticeThe purchased products, services and features are stipulated by the contract made between Huawei and thecustomer. All or part of the products, services and features described in this document may not be within thepurchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,and recommendations in this document are provided "AS IS" without warranties, guarantees or representationsof any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in thepreparation of this document to ensure accuracy of the contents, but all statements, information, andrecommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.Address: Huawei Industrial Base

Bantian, LonggangShenzhen 518129People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

Issue 05 (2014-11-10) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.

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http://www.huawei.com

mailto:[email protected]

About This Document

OverviewThis document describes how to install DC RRU3252(DC)&RRU3256(DC) (referred to as RRUin this document).

Product Version

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

Product Name Solution Version Product Version

DBS3900 SRAN7.0 and later versions V100R007C00 and laterversions

eRAN TDD 3.0 and laterversions

V100R005C00 and laterversions

Intended AudienceThis document is intended for:

eNodeB installation personnel

Organization1 Changes in RRU3252(DC)&RRU3256(DC) Installation Guide

This chapter describes changes in the installation guide.

2 Installation Preparations

This chapter describes the reference documents, tools, and instruments that must be ready beforethe installation. In addition, it specifies the skills that installation engineers must have.

3 Information About the Installation

RRU3252(DC)&RRU3256(DC)Installation Guide About This Document


ii

This chapter describes remote radio unit (RRU) information, including its exterior, ports,installation scenarios, and installation clearance requirements. The information must be obtainedbefore the RRU installation.

4 Unpacking the Equipment

This chapter describes how to unpack and check the delivered equipment to ensure that all thematerials are included and intact.

5 Installation Process

This chapter describes how to install a remote radio unit (RRU), which involves installing anRRU and RRU cables, checking the RRU hardware installation, and powering on the RRU.

6 Hoisting the RRU and Cables onto a Tower

This section describes how to hoist the remote radio unit (RRU) and cables onto a tower andprovides important notes about the installation.

7 Installing RRU

This chapter describes how to install a remote radio unit (RRU).

8 Installing RRU Cables

This chapter describes how to install cables for a remote radio unit (RRU).

9 Checking the RRU Hardware Installation

This chapter describes how to check the hardware installation after a remote radio unit (RRU)is installed.

10 Checking the Power-on Status of an RRU

This chapter describes how to check the power-on status of a remote radio unit (RRU) after allthe devices are installed.

11 Appendix

This section describes how to add a tool-less female connector (pressfit type).

ConventionsSymbol Conventions

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

Symbol Description

Indicates an imminently hazardous situation which, if notavoided, will result in death or serious injury.

Indicates a potentially hazardous situation which, if notavoided, could result in death or serious injury.



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Symbol Description

Indicates a potentially hazardous situation which, if notavoided, may result in minor or moderate injury.

Indicates a potentially hazardous situation which, if notavoided, could result in equipment damage, data loss,performance deterioration, or unanticipated results.NOTICE is used to address practices not related to personalinjury.

Calls attention to important information, best practices andtips.NOTE is used to address information not related to personalinjury, equipment damage, and environment deterioration.

General Conventions

The general conventions that may be found in this document are defined as follows.

Convention Description

Times New Roman Normal paragraphs are in Times New Roman.

Boldface Names of files, directories, folders, and users are inboldface. For example, log in as user root.

Italic Book titles are in italics.

Courier New Examples of information displayed on the screen are inCourier New.

Command Conventions

The command conventions that may be found in this document are defined as follows.


Boldface The keywords of a command line are in boldface.

Italic Command arguments are in italics.

[ ] Items (keywords or arguments) in brackets [ ] are optional.

{ x | y | ... } Optional items are grouped in braces and separated byvertical bars. One item is selected.

[ x | y | ... ] Optional items are grouped in brackets and separated byvertical bars. One item is selected or no item is selected.



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{ x | y | ... }* Optional items are grouped in braces and separated byvertical bars. A minimum of one item or a maximum of allitems can be selected.

[ x | y | ... ]* Optional items are grouped in brackets and separated byvertical bars. Several items or no item can be selected.

GUI Conventions

The GUI conventions that may be found in this document are defined as follows.


Boldface Buttons, menus, parameters, tabs, window, and dialog titlesare in boldface. For example, click OK.

> Multi-level menus are in boldface and separated by the ">"signs. For example, choose File > Create > Folder.

Keyboard Operations

The keyboard operations that may be found in this document are defined as follows.

Format Description

Key Press the key. For example, press Enter and press Tab.

Key 1+Key 2 Press the keys concurrently. For example, pressing Ctrl+Alt+A means the three keys should be pressed concurrently.

Key 1, Key 2 Press the keys in turn. For example, pressing Alt, A meansthe two keys should be pressed in turn.

Mouse Operations

The mouse operations that may be found in this document are defined as follows.

Action Description

Click Select and release the primary mouse button without movingthe pointer.

Double-click Press the primary mouse button twice continuously andquickly without moving the pointer.



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Action Description

Drag Press and hold the primary mouse button and move thepointer to a certain position.



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Contents

About This Document.....................................................................................................................ii

1 Changes in RRU3252(DC)&RRU3256(DC) Installation Guide............................................1

2 Installation Preparations..............................................................................................................32.1 Reference Documents.....................................................................................................................................................42.2 Tools and Instruments....................................................................................................................................................42.3 Skills and Requirements for Onsite Personnel...............................................................................................................5

3 Information About the Installation...........................................................................................63.1 RRU Exterior..................................................................................................................................................................73.2 RRU Ports.......................................................................................................................................................................83.3 RRU Indicators...............................................................................................................................................................93.4 Installation Options and Restrictions............................................................................................................................113.5 Installation Clearance Requirements of an RRU..........................................................................................................173.5.1 Installation Clearance for a Single RRU...................................................................................................................173.5.2 Installation Clearance for Multiple RRUs.................................................................................................................203.5.3 Spacing Between RRUs.............................................................................................................................................23

4 Unpacking the Equipment.........................................................................................................26

5 Installation Process.....................................................................................................................28

6 Hoisting the RRU and Cables onto a Tower..........................................................................296.1 Installing an RRU on a Tower......................................................................................................................................306.2 Hoisting Fiber Optic Cable onto a Tower....................................................................................................................336.3 Hoisting Power Cables onto a Tower...........................................................................................................................35

7 Installing RRU.............................................................................................................................397.1 RRU Mounting Kits .....................................................................................................................................................407.2 Installing RRU on a Pole..............................................................................................................................................407.2.1 Installing a Single RRU.............................................................................................................................................457.2.2 Installing Two RRUs.................................................................................................................................................487.2.3 Installing Three or More RRUs.................................................................................................................................507.3 Installing an RRU on the U-Steel.................................................................................................................................557.4 Installing an RRU on the Angle Steel..........................................................................................................................597.5 Installing an RRU on a Wall.........................................................................................................................................62

RRU3252(DC)&RRU3256(DC)Installation Guide Contents


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8 Installing RRU Cables................................................................................................................678.1 Cabling Requirements..................................................................................................................................................698.2 Cable Connections........................................................................................................................................................758.3 Process of Installing RRU Cables................................................................................................................................798.4 RRU Cable List............................................................................................................................................................808.5 Installing an RRU PGND Cable...................................................................................................................................818.6 Installing an RRU RF Jumper......................................................................................................................................838.7 (Optional) Installing an RRU Alarm Cable..................................................................................................................868.8 Installing an RRU AISG Multi-Core Cable and an RRU AISG Extension Cable.......................................................878.9 Opening the Cover Plate of the RRU Cabling Cavity..................................................................................................908.10 Installing a CPRI Fiber Optic Cable...........................................................................................................................928.11 Installing an RRU power cable...................................................................................................................................938.12 Closing the Cover Plate of an RRU Cabling Cavity..................................................................................................95

9 Checking the RRU Hardware Installation..............................................................................98

10 Checking the Power-on Status of an RRU............................................................................99

11 Appendix...................................................................................................................................10111.1 Adding a Tool-less Female Connector (Pressfit Type) to an RRU Power Cable.....................................................102

RRU3252(DC)&RRU3256(DC)Installation Guide Contents


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1 Changes in RRU3252(DC)&RRU3256(DC)Installation Guide

This chapter describes changes in the installation guide.

05 (2014-11-10)

This is the fifth official release.

Compared with issue 04 (2014-10-24), this issue does not include any new information.

Compared with issue 04 (2014-10-24), this issue includes the following change.

Topic Change Description

8.11 Installing an RRU power cable Modified the precautions in the backgroundinformation.

11.1 Adding a Tool-less Female Connector(Pressfit Type) to an RRU Power Cable

Added the precaution that do not reverselyconnect the positive and negative poles in theprocedure.

No information in issue 04 (2014-10-24) is deleted from this issue.

04 (2014-10-24)

This is the fourth official release.




3.4 Installation Options and Restrictions Optimized the description of restrictions.

7 Installing RRU Optimized the description of the distancebetween the mounting kit and the ground.

RRU3252(DC)&RRU3256(DC)Installation Guide

1 Changes in RRU3252(DC)&RRU3256(DC) InstallationGuide


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03 (2014-04-30)

This is the third official release.




8.7 (Optional) Installing an RRU AlarmCable

Added precautions for installing alarmcables.


02 (2013-05-10)

This is the second official release.




8.4 RRU Cable List Modified the remote radio unit (RRU) cablelist.


01 (2013-03-01)

This is the first official release.

Compared with draft A (2012-11-30), this issue does not include any new information.

Compared with draft A (2012-11-30), this issue does not include any changes.

No information in draft A (2012-11-30) is deleted from this issue.

Draft A (2012-11-30)

This is a draft.

RRU3252(DC)&RRU3256(DC)Installation Guide

1 Changes in RRU3252(DC)&RRU3256(DC) InstallationGuide


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2 Installation Preparations

About This Chapter

This chapter describes the reference documents, tools, and instruments that must be ready beforethe installation. In addition, it specifies the skills that installation engineers must have.

2.1 Reference DocumentsThis section describes reference documents that installation engineers must comprehend beforethe installation.

2.2 Tools and InstrumentsThis section describes the tools and instruments that must be prepared before the remote radiounit (RRU) installation.

2.3 Skills and Requirements for Onsite PersonnelOnsite personnel must be qualified and trained. Before performing any operation, onsitepersonnel must be familiar with correct operation methods and safety precautions.

RRU3252(DC)&RRU3256(DC)Installation Guide 2 Installation Preparations


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2.1 Reference DocumentsThis section describes reference documents that installation engineers must comprehend beforethe installation.

The following reference documents are required during the remote radio unit (RRU) installation:l RRU3252(DC)&RRU3256(DC) Hardware Descriptionl DBS3900 Installation Guidel OCB-01M User Guide

This document describes how to install an RRU on a pole, U-steel, angle steel, or a wall. If RRUsare installed on an IFS06, the following reference document is required:l DBS3900 (ICR) Installation Guide

2.2 Tools and InstrumentsThis section describes the tools and instruments that must be prepared before the remote radiounit (RRU) installation.

Hammer drill (φ 12 bit to φ14 bit)

Electrostatic discharge(ESD) gloves

Vacuum cleaner

Heat gun Phillips screwdriver (M3 toM6)

Flat-head screwdriver (M3 toM6)

Rubber mallet COAX crimping tool Wire stripper

Power cable crimping tool RJ11 crimping tool Diagonal pliers



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Utility knife Cable cutter Hydraulic pliers

Adjustable wrench (capacity≥ 32 mm)

Torque wrench

Capacity: 16 mm, 17 mm, 21mm, or 32 mm

Combination wrench

Capacity: 16 mm, 17 mm, 21mm, or 32 mm

Torque screwdriver

5 mm

5 mm

(M3 to M6)

(M3 to M6)

Marker (diameter ≤ 10 mm)

Level

Torque socket

16 mm

Multimeter Measuring tape

Hex key Fixed pulley Lifting sling

2.3 Skills and Requirements for Onsite PersonnelOnsite personnel must be qualified and trained. Before performing any operation, onsitepersonnel must be familiar with correct operation methods and safety precautions.

Before the installation, pay attention to the following items:

l The customer's technical engineers must be trained by Huawei and be familiar with theproper installation and operation methods.

l The number of onsite personnel depends on the engineering schedule and installationenvironment. Generally, only three to five onsite personnel are necessary.



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3 Information About the Installation

About This Chapter

This chapter describes remote radio unit (RRU) information, including its exterior, ports,installation scenarios, and installation clearance requirements. The information must be obtainedbefore the RRU installation.

3.1 RRU ExteriorThis section describes the exterior and dimensions of an RRU.

3.2 RRU PortsAn RRU has a bottom panel, cabling cavity panel, and indicator panel.

3.3 RRU IndicatorsThere are six indicators on an RRU. They indicate the running status.

3.4 Installation Options and RestrictionsThis section describes remote radio unit (RRU) installation environment, restrictions, andoptions. An RRU can be installed on a pole, U-steel, angle steel, or a wall.

3.5 Installation Clearance Requirements of an RRUThis section describes the requirements for the installation clearance of a single remote radiounit (RRU) and multiple RRUs and the requirements for the installation spacing between RRUs.

RRU3252(DC)&RRU3256(DC)Installation Guide 3 Information About the Installation


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3.1 RRU ExteriorThis section describes the exterior and dimensions of an RRU.

Figure 3-1 shows an RRU.

Figure 3-1 RRU exterior

Figure 3-2 shows RRU dimensions.

Figure 3-2 RRU dimensions



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3.2 RRU PortsAn RRU has a bottom panel, cabling cavity panel, and indicator panel.

Figure 3-3 shows the ports on the RRU panels.

Figure 3-3 Ports on the RRU panels

Table 3-1 describes ports and indicators on the RRU panels.



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Table 3-1 Ports and indicators on the RRU panels

Item Silkscreen Description

1. Ports at the bottom ANT0-ANT3 TX/RX port. ANT0 port supports RET signaltransmission.

RET/EXT_ALM RET port for RET signal transmission, oralarm port for monitoring one RS485 signalinput and two dry contact signal inputs

RGPS RGPS port, transmitting RGPS signals

2. Ports in the cablingcavity

CPRI0/IR0 Optical port

CPRI1/IR1

RTN(+) Power supply ports

NEG(-)

3. Indicators RUN For details, see 3.3 RRU Indicators.

ALM

ACT

VSWR

CPRI0/IR0

CPRI1/IR1

NOTE

If only two RF ports are required, ANT0 and ANT1 are used by default.

Which port is used for transmitting RET signals is determined by the software.

3.3 RRU IndicatorsThere are six indicators on an RRU. They indicate the running status.

For detailed positions of RRU indicators, see 3.2 RRU Ports.

Table 3-2 describes RRU indicators.

Table 3-2 RRU indicators

Silkscreen

Color Status Description

RUN Green Steady on There is power supply, but the boardis faulty.



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Silkscreen


Steady off There is no power supply, or the boardis faulty.

Blinking (on for 1s and offfor 1s)

The board is running properly.

Blinking (on for 0.125s andoff for 0.125s)

Software is being loaded to the board,or the board is not started.

ALM Red Steady on Alarms are generated, and the modulemust be replaced.

Steady off No alarm is generated.


Alarms are generated. The alarmsmay be caused by the faults on therelated boards or ports. Therefore,you need to locate the fault beforedeciding whether to replace themodule.

ACT Green Steady on The module is running properly withTX channels enabled or the softwareis being loaded without RRU running.


The board is running properly withTX channels disabled.

VSWR Red Steady off No VSWR alarm is generated.

Steady on VSWR alarms are generated.

CPRI0/IR0

Red orgreen

Steady green The CPRI link is functioningproperly.

Steady red An optical module fails to receivesignals because the optical module isfaulty or the optical fiber is broken.

Blinking red (on for 1s andoff for 1s)

The CPRI link is out of lock becauseof mutual lock of dual-mode clocksources or mismatched data rates overCPRI ports (you are advised to checkthe system configuration to identifythe fault).

Steady off The SFP module is not properlyinstalled, or the optical module ispowered off.

CPRI1/IR1

Red orgreen

Steady green The CPRI link is functioningproperly.



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Silkscreen


Steady red An optical module fails to receivesignals because the optical module isfaulty or the optical fiber is broken.

Blinking red (on for 1s andoff for 1s)

The CPRI link is out of lock becauseof mutual lock of dual-mode clocksources or mismatched data rates overCPRI ports (you are advised to checkthe system configuration to identifythe fault).

Steady off The SFP module is not properlyinstalled, or the optical module ispowered off.

3.4 Installation Options and RestrictionsThis section describes remote radio unit (RRU) installation environment, restrictions, andoptions. An RRU can be installed on a pole, U-steel, angle steel, or a wall.

RestrictionsAmbient environment:

To ensure proper heat dissipation of the RRU, the following requirements must be met:l The RRU cannot be installed in an enclosed cabinet without a cooling system.l The RRU cannot be installed in an enclosed camouflage box.l The RRU cannot be installed in an enclosed equipment room without a cooling system.

NOTICEAn inappropriate ambient environment reduces the heat dissipation efficiency and an RRU maynot work properly, as shown in Figure 3-4.



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Figure 3-4 Inappropriate ambient environment

Installation Model The installation supports' specifications described in this document are only based on the

exterior and dimensions of the mounting kits. Before installing equipment, assess thestrength and reliability of the installation support to determine whether it can bear the weightof the equipment.

l To ensure the heat dissipation of the RRU and waterproofing of the ports at the bottom ofthe RRU, the vertical deviation angle of an RRU must be less than or equal to 10 degrees,as shown in Figure 3-5.

l An RRU can be installed on a pole, U-steel, or angle steel on a tower. The side-mountedinstallation mode is recommended for the RRU on the main pole secured on a tower. Thisinstallation mode allows multiple RRUs to be centrally installed. If the horizontal distancebetween the main and auxiliary poles on a tower is greater than or equal to 810 mm (23.62in.), the side-mounted installation mode is recommended for installing the RRU on theauxiliary pole. Otherwise, the standard installation mode is recommended for installing theRRU on the auxiliary pole.

Figure 3-5 Requirements for the vertical deviation angle of an RRU

1. RRU 2. RRU holder



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Installing an RRU on a PoleFigure 3-6 shows the diameter of a pole for installing an RRU.

Figure 3-6 Diameter of a pole

NOTICEl The diameter of a pole for installing an RRU ranges from 60 mm to 114 mm (2.36 in. to 4.49

in.). The recommended diameter is 80 mm (3.15 in.).l A pole with a diameter ranging from 60 mm to 76 mm (2.36 in. to 2.99 in.) can support a

maximum of three RRUs.l If more than three RRUs are required, a pole with a diameter ranging from 76 mm to 114

mm (2.99 in. to 4.49 in.) must be used to support them.l The recommended pole thickness is greater than or equal to 3.5 mm (0.14 in.).

Figure 3-7 shows a pole-mounted RRU.



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Figure 3-7 Pole-mounted RRU

Installing an RRU on the U-steelFigure 3-8 shows U-steel specifications.

Figure 3-8 U-steel specifications

NOTE

It is recommended that only one RRU be installed on one U-steel.

Figure 3-9 shows a U-steel-mounted RRU.



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Figure 3-9 U-steel-mounted RRU

Installing an RRU on the Angle SteelFigure 3-10 shows angle steel specifications.

Figure 3-10 Angle steel specifications

NOTE

It is recommended that only one RRU be installed on one angle steel.

Figure 3-11 shows an angle steel-mounted RRU.



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Figure 3-11 Angle steel-mounted RRU

Installing an RRU on a WallThe wall on which RRUs are installed must meet the following requirements:l When a single RRU is installed, the wall can bear at least four times the weight of the RRU.l Expansion bolts must be tightened with a torque of 30 N·m (265.52 lbf·in.) to ensure the

bolts work properly and the wall remains intact without cracks in it.

Figure 3-12 shows a wall-mounted RRU.



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Figure 3-12 Wall-mounted RRU

3.5 Installation Clearance Requirements of an RRUThis section describes the requirements for the installation clearance of a single remote radiounit (RRU) and multiple RRUs and the requirements for the installation spacing between RRUs.

l The recommended installation clearance ensures normal running and provides anappropriate space for operation and maintenance (OM). When the ambient space issufficient, the recommended installation clearance can be adopted.

l The minimum installation clearance ensures normal running and heat dissipation, but OMactivities, such as checking indicator status and opening the maintenance cavity, cannot beproperly conducted. When the ambient space is restricted, the minimum installationclearance can be adopted.

If an RRU is installed on the bitumen ground, the RRU must be at least 500 mm (700 mm ormore as recommended) away from the bitumen ground. The following describes the spacerequirements for installing RRUs on the non-bitumen ground.

3.5.1 Installation Clearance for a Single RRUThis section describes the recommended and minimum installation clearance for a single remoteradio unit (RRU).

If an RRU is installed on the bitumen ground, the RRU must be at least 500 mm (700 mm ormore as recommended) away from the bitumen ground. The following describes the spacerequirements for installing a single RRU on the non-bitumen ground.



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Recommended Installation Clearance for a Single RRUFigure 3-13 shows the recommended clearance for a single RRU.

Figure 3-13 Recommended installation clearance for a single RRU

Minimum Installation Clearance for a Single RRUFigure 3-14 shows the minimum installation clearance for a single RRU.



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Figure 3-14 Minimum installation clearance for a single RRU

Minimum Installation Clearance for a Single RRU on a TowerFigure 3-15 shows the minimum installation clearance for a single RRU on a tower.

Figure 3-15 Minimum installation clearance for a single RRU on a tower



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3.5.2 Installation Clearance for Multiple RRUsThis section describes the recommended and minimum installation clearance for multiple remoteradio units (RRUs).

If an RRU is installed on the bitumen ground, the RRU must be at least 500 mm (700 mm ormore as recommended) away from the bitumen ground. The following describes the spacerequirements for installing multiple RRUs on the non-bitumen ground.

Recommended Installation Clearance for Multiple RRUs Installed in CentralizedMode

Figure 3-16 shows the recommended installation clearance for multiple RRUs installed incentralized mode.

Figure 3-16 Recommended installation clearance for multiple RRUs installed in centralizedmode

Minimum Installation Clearance for Multiple RRUs Installed in Centralized ModeFigure 3-17 shows the minimum installation clearance for multiple RRUs installed in centralizedmode.



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Figure 3-17 Minimum installation clearance for multiple RRUs installed in centralized mode

Recommended Installation Clearance for Multiple RRUs Installed on a Wall inStandard Mode

Determine the installation clearance for multiple RRUs installed on a wall in standard modebased on the recommended installation clearance for a single RRU and the recommendedinstallation clearance shown in Figure 3-18.

Figure 3-18 Recommended installation clearance for multiple RRUs installed on a wall instandard mode



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Minimum Installation Clearance for Multiple RRUs Installed on a Wall inStandard Mode

Determine the minimum installation clearance for multiple RRUs installed on a wall in standardmode based on the minimum installation clearance for a single RRU and the minimuminstallation clearance shown in Figure 3-19.

Figure 3-19 Minimum installation spacing between multiple RRUs installed on a wall instandard mode

Recommended Clearance for Multiple RRUs Side-Mounted on a WallDetermine the installation clearance for multiple RRUs side-mounted on a wall based on therecommended installation clearance for a single RRU side-mounted on a wall and therecommended installation clearance shown in Figure 3-20.



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Figure 3-20 Spacing between multiple RRUs side-mounted on a wall

3.5.3 Spacing Between RRUsThis section describes the horizontal and vertical installation spacing between remote radio units(RRUs).

Recommended Horizontal Spacing Between RRUs

Figure 3-21 shows the recommended horizontal spacing between RRUs.

Figure 3-21 Recommended horizontal spacing between RRUs

Minimum Horizontal Spacing Between RRUs

Figure 3-22 shows the minimum horizontal spacing between RRUs.



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Figure 3-22 Minimum horizontal spacing between RRUs

Recommended Vertical Spacing Between RRUsFigure 3-23 shows the recommended vertical spacing between RRUs.

Figure 3-23 Recommended vertical spacing between RRUs



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Minimum Vertical Spacing Between RRUsFigure 3-24 shows the minimum vertical spacing between RRUs.

Figure 3-24 Minimum vertical spacing between RRUs



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4 Unpacking the Equipment

This chapter describes how to unpack and check the delivered equipment to ensure that all thematerials are included and intact.

ContextNOTE

When transporting, moving, or installing the equipment, components, or parts, you must:

l Prevent them from colliding with doors, walls, shelves, or other objects.

l Wear clean gloves, and avoid touching the equipment, components, or parts with bare hands, sweat-soaked gloves, or dirty gloves.

NOTICEl After a cabinet or an BBU is unpacked, it must be powered on within 7 days.

l After an RRU is unpacked, it must be powered on within 24 hours.

Procedure

Step 1 Check the total number of articles in each case according to the packing list.

If ... Then ...

The total number tallies with the packinglist

Go to Step 2.

The total number does not tally with thepacking list

Find out the cause and report any missingarticles to the local Huawei office.

Step 2 Check the exterior of the packing case.

RRU3252(DC)&RRU3256(DC)Installation Guide 4 Unpacking the Equipment


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If ... Then ...

The outer packing is intact Go to Step 3.

The outer packing is severely damaged orsoaked

Find out the cause and report it to the localHuawei office.

Step 3 Check the type and quantity of the equipment in the cases according to the packing list.

If ... Then ...

Types and quantity of the article tally withthose on the packing list

Sign the Packing List with the customer.

Either shipment shortage, wrong shipmentor damaged articles.

Report to the local Huawei office.

CAUTIONl To protect the equipment and prevent damage to the equipment, you are advised to keep the

unpacked equipment and packing materials indoors, take photos of the stocking environment,packing case or carton, packing materials, and any rusted or eroded equipment, and then filethe photos.

l Verify that the insulation layers of all RRU cables are intact. If the insulation layers aredamaged or broken, water will penetrate into the cables, which may cause damages to RRUsor human injury.

----End

RRU3252(DC)&RRU3256(DC)Installation Guide 4 Unpacking the Equipment


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5 Installation Process

This chapter describes how to install a remote radio unit (RRU), which involves installing anRRU and RRU cables, checking the RRU hardware installation, and powering on the RRU.

Figure 5-1 shows the flowchart for installing an RRU.

Figure 5-1 Flowchart for installing an RRU

RRU3252(DC)&RRU3256(DC)Installation Guide 5 Installation Process


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6 Hoisting the RRU and Cables onto a Tower

About This Chapter

This section describes how to hoist the remote radio unit (RRU) and cables onto a tower andprovides important notes about the installation.

6.1 Installing an RRU on a TowerThis section describes how to install a remote radio unit (RRU) on a tower and provides importantnotes about the installation. An RRU can be installed on a pole, U-steel, or angle steel on a tower.

6.2 Hoisting Fiber Optic Cable onto a TowerThis section describes how to hoist fiber optic cables onto a tower and provides important notesabout the hoisting.

6.3 Hoisting Power Cables onto a TowerThis section describes how to hoist a power cable onto a tower and provides important notesabout the hoisting.

RRU3252(DC)&RRU3256(DC)Installation Guide 6 Hoisting the RRU and Cables onto a Tower


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6.1 Installing an RRU on a TowerThis section describes how to install a remote radio unit (RRU) on a tower and provides importantnotes about the installation. An RRU can be installed on a pole, U-steel, or angle steel on a tower.

PrerequisitesPlace a foam pad or cardboard on the ground to protect the housing of the RRU from damagebefore the binding. Do not stand the RRU upright because the radio frequency (RF) ports at theRRU bottom has a low load-bearing capacity.

ProcedureStep 1 Hoist the mounting kits and RRU onto a tower one by one, as shown in Figure 6-1.

NOTE

l The mounting kits are installed on a tower before the RRU is hoisted onto the tower.

l When hoisting the RRU or mounting kits, protect it or them from colliding with the tower.

Figure 6-1 Hoisting the RRU onto the tower

1. Lifting sling 2. Fixed pulley 3. Traction sling

1. Technician A climbs the tower, secures a fixed pulley to the support on the tower platform,

and then routes the lifting sling through the fixed pulley.2. Technician C uses the lifting sling to bind the RRU mounting kits, as shown in Figure

6-2. Then, technician C uses the lifting sling and traction sling to bind the RRU and hoistit, as shown in Figure 6-3.



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Figure 6-2 Binding RRU mounting kits

Figure 6-3 Binding an RRU

1. Lifting sling 2. Lifting eye 3. Traction sling 4. Handle



31

NOTICEl The load-bearing capacity of each sling must be greater than 200 kg (441 lb) and the

diameter of each sling must be less than 25 mm (0.98 in.). The angle at the top of thetraction sling (by the knot) must be less than or equal to 60°.

l When hoisting the RRU, protect it from colliding with the tower.l Install an RRU on a pole, angle steel, or U-steel after hoisting the RRU onto a tower.l Do not hoist the RRU by the handle or lifting eye only, as shown in Figure 6-4 and

Figure 6-5.

Figure 6-4 Forbidding hoisting an RRU by the handle only

Figure 6-5 Forbidding hoisting an RRU by the lifting eye only



32

3. Technician B pulls the lifting sling downwards, and technician C pulls the traction slingoutwards to protect the RRU from colliding with the tower.

Step 2 Technician A catches the RRU on a tower and install it.

Step 3 Remove the lifting sling and traction sling.

NOTE

The previous hoisting procedure is for reference only.

----End

6.2 Hoisting Fiber Optic Cable onto a TowerThis section describes how to hoist fiber optic cables onto a tower and provides important notesabout the hoisting.

Context

Cabling requirements for fiber optic cables are met. For details, see "Cabling Requirements".

Procedure

Step 1 Hoist the fiber optic cables onto the tower, as shown in Figure 6-6.

Figure 6-6 Hoisting the fiber optic cables onto a tower

1. Lifting sling 2. Fixed pulley 3. Traction sling



33

NOTICEBefore hoisting fiber optic cables onto the tower, connect the fiber optic cables to the remoteradio unit (RRU) or baseband unit (BBU) based on the labels on both ends of the cables anddetermine the hoisting direction.

1. Technician A climbs the tower, secures a fixed pulley to the support on the tower platform,and then routes the lifting sling through the fixed pulley.

2. Technician B places the fiber coiler for coiling fiber optic cables on the fiber spools, andtechnician D leads the lifting sling through the stretch sling of the fiber optic cables anduse the other sling as a traction sling to secure the cables 4 m (13.12 ft) away from thelifting sling, as shown in Figure 6-7.

Figure 6-7 Binding the fiber optic cables

1. Lifting sling 2. Stretch sling 3. Traction sling

NOTICEDo not remove the stretch sling and protection pipe or bind fiber optic cables using onesling, as shown in Figure 6-8.



34

Figure 6-8 Incorrect binding method

3. Technician B rotates the fiber spools at the speed of 5 m to 15 m (16.4 ft to 49.21 ft) per

minute to coil the fiber optic cables.4. Technician C pulls the lifting sling downwards, and technician D pulls the traction sling

outwards to protect the fiber optic cables from colliding with the tower.

Step 2 Secure the fiber optic cables to the tower vertically using cable clips.

Step 3 Remove the lifting sling, traction sling, and protection pipe.

NOTE


----End

6.3 Hoisting Power Cables onto a TowerThis section describes how to hoist a power cable onto a tower and provides important notesabout the hoisting.

ContextCabling requirements for power cables are met. For details, see "Cabling Requirements".

The connector to the RRU power cable on the RRU side is prepared off the tower. For details,see 11.1 Adding a Tool-less Female Connector (Pressfit Type) to an RRU Power Cable.

Procedure

Step 1 Hoist the power cables onto the tower, as shown in Figure 6-9.



35

Figure 6-9 Hoisting power cables onto the tower

1. Lifting sling 2. Fixed pulley

1. Technician A climbs the tower, secures a fixed pulley to the support on the tower platform,and then routes the lifting sling through the fixed pulley.

2. Installation engineer B secures three cable ties to the power cable connector, and thensecures the power cable to the lifting sling, as shown in Figure 6-10.

NOTE

The connector on the power cable in the figure is only an example. The actual connector may varyaccording to the situation.



36

Figure 6-10 Binding cable ties

3. Technician B wraps the power cable connector with a layer of PVC insulation tape, as

shown in Figure 6-11.NOTE

Wrap the PVC insulation tape from 30 mm (1.18 in.) away from one end of the connector until itreaches the other end of the connector. The total length of the wrapped connector is 100 mm (3.94in.).

Figure 6-11 Wrapping the PVC insulation tape



37

4. Technician C pulls the lifting sling downwards, and technician B pulls the traction sling

outwards to protect the power cables from colliding with the tower.

Step 2 Secure the power cables to the tower vertically using cable clips.

Step 3 Remove the lifting sling and traction sling.

NOTE


----End



38

7 Installing RRU

About This Chapter

This chapter describes how to install a remote radio unit (RRU).

NOTICEl Do not stand the RRU upright because the radio frequency (RF) ports at the RRU bottom

cannot support the weight of the RRU.l Place a foam pad or cardboard under an RRU to protect the RRU housing from damage

during the installation.

7.1 RRU Mounting KitsThis section describes the remote radio unit (RRU) bracket assembly, attachment plate.

7.2 Installing RRU on a PoleThis section describes how to install one or more remote radio units (RRUs) on a pole.

7.3 Installing an RRU on the U-SteelThis section describes how to install a remote radio unit (RRU) on the U-steel and providesimportant notes about the installation. The RRU installed on the U-steel can be mounted to atower or placed on the ground. It is recommended that only one RRU be installed on the U-steel.

7.4 Installing an RRU on the Angle SteelThis section describes how to install a remote radio unit (RRU) on the angle steel and providesimportant notes about the installation. The RRU installed on the angle steel can be mounted toa tower or placed on the ground. It is recommended that only one RRU be installed on the anglesteel.

7.5 Installing an RRU on a WallThis section describes how to install a remote radio unit (RRU) on a wall and provides importantnotes about the installation.

RRU3252(DC)&RRU3256(DC)Installation Guide 7 Installing RRU


39

7.1 RRU Mounting KitsThis section describes the remote radio unit (RRU) bracket assembly, attachment plate.

Figure 7-1 shows the bracket assembly for an RRU.

Figure 7-1 Bracket assembly for an RRU

1. Plastic screw cap 2. Standard M10 nut 3. Spring washer 4. Thick flat washer

5. M10x150 bolt 6. Auxiliary bracket 7. Hoist clamp on the main bracket 8. Main bracket

Figure 7-2 shows the rear view of an RRU.

Figure 7-2 Rear view of an RRU

1. Attachment plate

7.2 Installing RRU on a PoleThis section describes how to install one or more remote radio units (RRUs) on a pole.

Figure 7-3 shows a single pole-mounted RRU.



40

Figure 7-3 Single RRU installed on a pole

Figure 7-4 shows two RRUs installed on a pole.



41

Figure 7-4 Two RRUs installed on a pole

NOTE

l When you install two RRUs in back-to-back mode, ensure that the distance between the mounting kitsof the two RRUs equals the height of an RRU.

l Install the upper RRU first and then install the lower RRU.

Figure 7-5, Figure 7-6, and Figure 7-7 show three or more RRUs installed on a pole.



42

Figure 7-5 Three RRUs installed on a pole



43

Figure 7-6 Four RRUs installed on a pole



44

Figure 7-7 Six RRUs installed on a pole

7.2.1 Installing a Single RRUThis section describes how to install a single remote radio unit (RRU) on a pole and providesimportant notes about the installation.

Prerequisites

Before you install an RRU on a tower, the RRU and mounting kits are hoisted onto the tower.For details, see 6.1 Installing an RRU on a Tower.

The hoist clamp on the main bracket is secured properly.

Procedure

Step 1 Determine a position for installing the main bracket.



45

l If the RRU must be installed on a tower, see 3.5.1 Installation Clearance for a SingleRRU to determine a position.

l If the RRU must be installed on the ground, see Figure 7-8 to determine a position.

Figure 7-8 Distance between the main bracket and the ground

NOTE

As shown in the figure above, it is recommended that the main bracket be installed at a position 1200mm (47.24 in.) to 1600 mm (59.06 in.) high above the ground. If the space is insufficient, only the3.5 Installation Clearance Requirements of an RRU needs to be provided.

Step 2 Loosen the two M10 nuts on the mounting kits counterclockwise and move the M10x150 boltout of the U-shaped slot on the auxiliary component, as shown in Figure 7-9.

Figure 7-9 Opening the mounting kits

Step 3 Install the main and auxiliary mounting brackets onto a pole, and then tighten the bolt to the U-shaped slot on the auxiliary mounting bracket, as shown in Figure 7-10.



46

Figure 7-10 Main and auxiliary mounting brackets onto a pole

Step 4 Use a torque wrench (16 mm) to tighten the two M10 nuts with a torque of 40 N·m to ensurethat the main and auxiliary mounting brackets are fixed onto the pole, as shown in Figure7-11.

Figure 7-11 Tightening the main and auxiliary mounting brackets

1. Plastic screw cap

NOTE

l Do not remove the plastic screw cap on the bolt of the mounting kits.

l Tighten the two M10 bolts alternately to ensure that the extrusion parts of the two bolts have the samelength.



47

Step 5 Install the RRU onto the main bracket until the RRU snaps shut, as shown in Figure 7-12.

Figure 7-12 Installing the RRU onto the main bracket

----End

7.2.2 Installing Two RRUsThis section describes how to install two remote radio units (RRUs) on a pole and providesimportant notes about the installation.

Procedure

Step 1 Install the first RRU, as shown in Figure 7-13. For details, see 7.2.1 Installing a Single RRU.

Figure 7-13 Installing the first RRU



48

Step 2 Install the mounting kits of the second RRU. The distance between the mounting kits of the twoRRUs is the height of an RRU.

Step 3 Interchange the cover plate in the front with the attachment plate at the rear of the second RRU,as shown in Figure 7-14.

Figure 7-14 Interchanging the cover plate in the front with the attachment plate at the rear ofthe second RRU

1. Use an inner hexagon screwdriver to remove the attachment plate from the rear of the RRU.2. Install the attachment plate onto the front of the RRU, and use a torque screwdriver to

tighten the inner hexagon screws on the attachment plate to 5 N·m (55.31 lbf·in.).

Step 4 Install the second RRU on the second main bracket, as shown in Figure 7-15.

NOTE

When you install two RRUs in back-to-back mode, ensure that the cabling cavities of these two RRUs facethe same direction.



49

Figure 7-15 Installing the second RRU onto the main bracket

1. RRU installed in standard mode 2. RRU installed in reverse mode 3. Cabling cavity

----End

7.2.3 Installing Three or More RRUsThis section describes how to install three or more remote radio units (RRUs) on a pole andprovides important notes about the installation.

Context

A pole supports the installation of three, four, or six RRUs. The procedures for installing themare the same. Following is the procedure for installing four RRUs on a pole.

Procedure

Step 1 Install the first set of mounting kits on a pole. For details, see 7.2.1 Installing a Single RRU.

Step 2 Remove an attachment plate from the rear of the RRU, and install it on one side of the RRU, asshown in Figure 7-16. (Repeat this step to change the positions of all the other attachment platesof the RRU.)



50

Figure 7-16 Moving the attachment plate from the rear of the RRU to one side of the RRU

1. Use an inner hexagon screwdriver to remove the attachment plate from the rear of the RRU.2. Install the attachment plate onto the side of the RRU, and use a torque screwdriver to tighten

the stainless steel screws on the attachment plate with a torque of 5 N·m (44.25 lbf·in.).

Step 3 Install the first RRU on the main bracket in the first set of mounting kits, as shown in Figure7-17.

Figure 7-17 Installing the first RRU onto the main bracket

Step 4 Install the second main bracket on the side of the first main bracket, as shown in Figure 7-18.



51

Figure 7-18 Installing the second main bracket

Step 5 Install the second RRU on the second main bracket, as shown in Figure 7-19.

Figure 7-19 Installing the second RRU onto the main bracket

Step 6 Install the third main bracket and the third RRU, as shown in Figure 7-20.



52

Figure 7-20 Installing the third RRU on the main bracket

NOTE

Install the third and second RRUs on both sides of the first RRU.

Step 7 At a proper position above or below the first set of RRU mounting kits, install the second set ofRRU mounting kits, as shown in Figure 7-21.



53

Figure 7-21 Installing the second set of mounting kits

Step 8 Install the fourth RRU on the main bracket of the second set of mounting kits, as shown inFigure 7-22.



54

Figure 7-22 Installing the fourth RRU on the main bracket

----End

7.3 Installing an RRU on the U-SteelThis section describes how to install a remote radio unit (RRU) on the U-steel and providesimportant notes about the installation. The RRU installed on the U-steel can be mounted to atower or placed on the ground. It is recommended that only one RRU be installed on the U-steel.

Prerequisites



Context

Figure 7-23 shows the top view of the RRU installed on the U-steel.



55

Figure 7-23 Top view of the RRU installed on the U-steel

1. U-steel

NOTE

If the flange width of the U-steel is less than 40 mm (1.57 in.), only mode a and mode b in Figure 7-23are supported.

Procedure







56

NOTE

As shown in the figure above, it is recommended that the main bracket be installed at a position 1200mm (47.24 in.) to 1600 mm (59.06 in.) high above the ground. If the space is insufficient, only the 3.5Installation Clearance Requirements of an RRU needs to be provided.



Step 3 Slide the main and auxiliary brackets onto the U-steel and fit a bolt into the U-shaped slot, asshown in Figure 7-26.

Figure 7-26 Sliding the main and auxiliary brackets onto the U-steel

Step 4 Use a 16 mm (0.63 in.) torque wrench to tighten the two M10 nuts with a torque of 40 N·m(354.03 lbf·in.) so that the main and auxiliary brackets are tightly secured onto the U-steel, asshown in Figure 7-27.



57



NOTE







58

----End

7.4 Installing an RRU on the Angle SteelThis section describes how to install a remote radio unit (RRU) on the angle steel and providesimportant notes about the installation. The RRU installed on the angle steel can be mounted toa tower or placed on the ground. It is recommended that only one RRU be installed on the anglesteel.

Prerequisites



Context

Figure 7-29 shows the top view of the RRU installed on the angle steel.

Figure 7-29 Top view of the RRU installed on the angle steel

1. Angle steel

Procedure






59


NOTE

As shown in the figure above, it is recommended that the main bracket be installed at a position 1200mm (47.24 in.) to 1600 mm (59.06 in.) high above the ground. If the space is insufficient, only the 3.5Installation Clearance Requirements of an RRU needs to be provided.



Step 3 Slide the main and auxiliary brackets onto the angle steel and fit a bolt into the U-shaped slot,as shown in Figure 7-32.

Figure 7-32 Sliding the main and auxiliary brackets onto the angle steel



60

Step 4 Use a 16 mm (0.63 in.) torque wrench to tighten the two M10 nuts with a torque of 40 N·m(354.03 lbf·in.) so that the main and auxiliary brackets are tightly secured onto the angle steel,as shown in Figure 7-33.



NOTE






61


----End

7.5 Installing an RRU on a WallThis section describes how to install a remote radio unit (RRU) on a wall and provides importantnotes about the installation.

Prerequisites


Context

Requirements for installing an RRU on the wall are as follows:

l When a single RRU is installed, the wall must be capable of bearing at least four times theweight of the RRU.

l Expansion bolts must be tightened with a torque of 15 N·m (115.06 lbf·in.) to ensure thebolts work properly and the wall remains intact without cracks in it.

Procedure

Step 1 Remove the plastic cap, M10 nut, spring washer, thick flat washer, auxiliary bracket, andM10x150 bolt one by one. Reserve the main bracket for the wall-mounted installation.

Step 2 Place the main bracket against the installation position, use a level to verify that the main bracketis placed horizontally, and then mark anchor points with a marker, as shown in Figure 7-35.



62

Figure 7-35 Marking anchor points

1. Main bracket 2. RRU

NOTE

As shown in the figure above, it is recommended that the main bracket be installed at a position 1200 mm(47.24 in.) to 1600 mm (59.06 in.) high above the ground. If the space is insufficient, only the 3.5Installation Clearance Requirements of an RRU needs to be provided.

Figure 7-36 Expansion bolt

1. M8x85 bolt 2. Spring washer 8 3. Plastic tube 4. Flat washer 8 5. Expansion tube

Step 3 Drill holes at the anchor points, and then install expansion bolts, as shown in Figure 7-37.



63

Figure 7-37 Drilling a hole and installing an expansion bolt

1. Use a hammer drill with a Ф12 bit to drill holes vertically at the marked anchor points with

the depth ranging from 55 mm (2.17 in.) to 60 mm (2.36 in.), use a vacuum cleaner to clearthe dust out from inside and around the holes, and measure the distances between holes. Ifany of the hole is beyond the acceptable range, mark a new anchor point and drill a newhole.

CAUTIONTo prevent inhalation or eye contact with dust, take adequate preventive measures whendrilling holes.

2. Place one expansion bolt vertically into each hole, and pound it with a rubber mallet untilthe expansion tube completely enters the hole.

3. Partially tighten the expansion bolts clockwise.4. Rotate the bolts counterclockwise to loosen them, and remove each M10x65 bolt, spring

washer, plastic tube, and flat washer in sequence.

NOTE

After completely removing an expansion bolt, store the plastic tube properly.

Step 4 Hammer the two M8x85 expansion bolts removed from the main bracket into the wall and usea combination wrench to tighten the nuts of the expansion bolts with a torque of 15 N·m (132.76lbf·in.), as shown in Figure 7-38.



64

Figure 7-38 Installing the main bracket on the wall

1. M8x85 expansion bolt 2. Spring washer 3. Flat washer




65

Figure 7-39 Installing an RRU

----End



66

8 Installing RRU Cables

About This Chapter

This chapter describes how to install cables for a remote radio unit (RRU).

8.1 Cabling RequirementsCables must be routed according to the specified cabling requirements to prevent signalinterference.

8.2 Cable ConnectionsThis section describes the cable connections for a remote radio unit (RRU).

8.3 Process of Installing RRU CablesThis section describes how to install remote radio unit (RRU) cables.

8.4 RRU Cable ListThis section describes the cables for the RRU. It also describes the connectors at the two endsof the cables and the cable connections of the RRU.

8.5 Installing an RRU PGND CableThis section describes how to install the protection ground (PGND) cable for a remote radio unit(RRU).

8.6 Installing an RRU RF JumperThis section describes how to install a remote radio unit (RRU) RF jumper.

8.7 (Optional) Installing an RRU Alarm CableThis section describes how to install the alarm cable for a remote radio unit (RRU).

8.8 Installing an RRU AISG Multi-Core Cable and an RRU AISG Extension CableThis section describes how to install a remote radio unit (RRU) AISG multi-core cable and anRRU AISG extension cable. AISG is short for Antenna Interface Standards Group.

8.9 Opening the Cover Plate of the RRU Cabling CavityThis section describes how to open the cover plate of a remote radio unit (RRU) cabling cavity.

8.10 Installing a CPRI Fiber Optic CableThis section describes how to install a CPRI fiber optic cable.

8.11 Installing an RRU power cable

RRU3252(DC)&RRU3256(DC)Installation Guide 8 Installing RRU Cables


67

This section describes how to install a remote radio unit (RRU) power cable.

8.12 Closing the Cover Plate of an RRU Cabling CavityThis section describes how to close the cover plate of a remote radio unit (RRU) cabling cavity.



68

8.1 Cabling RequirementsCables must be routed according to the specified cabling requirements to prevent signalinterference.

NOTE

If a cable listed below is not required, skip the requirements for routing the cable.

General Cabling Requirements

Bending Radius Requirementsl The bending radius of a 7/8'' feeder must be more than 250 mm (9.84 in.), and the bending

radius of a 5/4'' feeder must be more than 380 mm (14.96 in.).

l The bending radius of a 1/4'' jumper must be more than 35 mm (1.38 in.). The bendingradius of a super-flexible 1/2'' jumper must be more than 50 mm (1.97 in.), and the bendingradius of an ordinary 1/2'' jumper must be more than 127 mm (5 in.).

l The bending radius of a power cable or PGND cable must be at least three times the lengthof the cable diameter.

l The bending radius of a fiber optic cable is at least 20 times the diameter of the fiber opticcable, and the minimum bending radius of the breakout cable at each end of the fiber opticcable is 30 mm (1.18 in.).

l The bending radius of an E1/T1 cable must be at least three times the length of its diameter.

l The bending radius of a signal cable must be at least five times the length of its diameter.

Cable Binding Requirementsl Cables of the same type must be bound together.

l Different types of cable must be separately routed with a minimum spacing of 30 mm (1.18in.) and cannot be entangled.

l The cables are bound tightly and neatly and the sheath of the cables is intact.

l The cable ties must face the same direction, and those at the same horizontal line must bein a straight line.

l The extra length of each indoor cable tie must be cut off. A slack of 5 mm (0.2 in.) isreserved for each outdoor cable tie before the extra length is cut off. All cut surfaces haveno sharp edges.

l Labels or nameplates are attached to both ends, joints, or turns of cables after they areinstalled.

Security Requirementsl When routing cables, avoid sharp objects, for example sharp edges on the wall. If necessary,

use tubes to protect the cables.

l Cables are routed away from heat sources, or heat-insulation materials are added betweencables and heat sources.

l A clearance is reserved at turns of a cable or the position close to a device, facilitating cableand device maintenance. The recommended clearance is about 0.1 m (0.33 ft).

Indoor Cabling Requirements



69

l Cables are routed indoors through the feeder window.l Drip loops must be prepared outside the feeder window, and the requirements for the

minimum bending radius are met.l When cables are routed indoors, engineers are required indoors for cooperation.l The feeder window must be waterproofed.

Outdoor Cabling Requirementsl Cables routed outdoors must be routed through a pipe to protect them from being damaged.l AC power cables, transmission cables, and cables buried in the ground must be protected.l If cables at the cabinet bottom need to be routed through a pipe along the ground, lead the

pipe into the cabinet base for about 30 mm to 50 mm (1.18 in. to 1.97 in.), not into thecabinet. Block the pipe with waterproof tape or silicon gel, and secure the pipe to the cablehole at the cabinet base with metal piece.

l If cables at the cabinet bottom need to be routed through a pipe along the metal cable trough,do not lead the pipe into the cabinet base. The cable trough must be sealed and routedthrough the cable hole at the cabinet base.

l When routing RRU cables, ensure that the highest positions of the routes of all RRU cables(except RF cables and AISG cables) must be lower than the bottom of the RRU.

l Cables are secured with cable clips.l Cables are routed neatly along the specified cabling direction and secured with cable clips.l The positions for cable clips are determined onsite. For example, the cable clips for the

7/8" feeder are installed at a spacing of 1.5 m to 2 m (4.92 ft to 6.56 ft) in the same direction,and the cable clips for the power cables are also installed at a spacing of 1.5 m to 2 m (4.92ft to 6.56 ft) in the same direction.

l Cable clips must be vertical with cables, and the cables in a cable clip must be parallel.l After routing cables neatly and correctly, tighten the screws on cable clips.

Figure 8-1 shows how to secure cables on a cable tray.



70

Figure 8-1 Securing cables on a cable tray

Figure 8-2 shows how to secure cables on a tower.



71

Figure 8-2 Securing cables on a tower

Special Cabling RequirementsCabling Requirements for Power Cablesl Positions for routing power cables meet requirements of the engineering design.l The power cable is long enough without any connectors or soldering joints in the middle.l Cables must be routed only under well-planned instructions, by qualified professionals,

and with ready communication facilities.l Do not circle or twist cables.l After routing a DC power cable onto the platform on a tower, lay out the cable on the

guardrail with the shortest distance and route the cable along the guardrail.



72

l After routing a DC power cable near a device on the tower, use clips to secure the powercable onto a pole or the rails surrounding the platform. Ensure that the device is not too faraway from the position where the power cable is secured.

Cabling Requirements for Protection Ground (PGND) Cablesl PGND cables for a base station must be connected to the same ground bar.l PGND cables must be buried in the ground or routed indoors. They should not be routed

overhead before they are led into the equipment room.l Outer conductors of coaxial cables and both ends of the shield layers on shielded cables

are in proper electrical contact with the metal surface of the equipment to which they areconnected.

l PGND cables and signal cables must be installed untangled and orderly. A certain distancemust be reserved between them to prevent interference from each other.

l Fuses or switches must not be installed on the PGND cables.l Other devices must not be used for electrical connections of the PGND cables.l All the metal parts in the housing of the equipment must be reliably connected to the ground

terminal.

Cabling Requirements for E1 Cablesl E1 cables must not cross power cables, PGND cables, or RF cables when routed. If

transmission cables are routed with power cables, PGND cables, or RF cables in parallel,the spacing between them must be greater than 30 mm (1.18 in.).

l E1 cables are routed straightly and bound neatly with cable ties.l Sufficient slack is reserved in E1 cables at turns.l E1 cables cannot be squeezed by the cabinet door when routed through the cabinet, as

shown in Figure 8-3.

Figure 8-3 E1 cables routed through the cabinet

Cabling Requirements for Fiber Optic Cablesl A minimum of three qualified or trained personnel are required to route fiber optic cables.l The ambient temperature for fiber optic cables ranges from -40°C to +60°C (-40°F to +140°

F). If the actual temperature exceeds the range, preventive measures are taken or a newcabling route is required.

l Do not circle or twist cables.



73

l Do not tie fiber optic cables at turns.l Do not stretch, step on, or place heavy objects on fiber optic cables. Keep the fiber optic

cables away from sharp objects.l When fiber optic cables are routed, the extra length of the cables must be coiled around

special devices, such as a fiber coiler.l An unarmored fiber optic cable must be bound using binding straps. If a fiber optic patch

cord needs to be secured in a cabinet or a piece of equipment, use binding straps to bind itand then use cable ties to secure the binding straps to the cabinet or equipment. Ensure thatthe fiber optic cables can flexibly move in the cable ties. Do not bend the fiber optic cablessharply. The following figure shows how to bind the fiber optic cables correctly.

Figure 8-4 Binding fiber optic cables

l When coiling fiber optic cables, apply even strength. Do not bend the cables with force.l Vacant optical connectors must be covered with dustproof caps.l Fiber optic cables cannot be squeezed by a cabinet door when they are routed along the

inner side of the cabinet, as shown in Figure 8-5, Figure 8-6, and Figure 8-7.

Figure 8-5 CPRI fiber optic cables routed in a cabinet (1)



74

Figure 8-6 CPRI fiber optic cables routed in a cabinet (2)

Figure 8-7 FE/GE fiber optic cables routed in the cabinet

l If fiber optic cables need to be routed on the platform on a tower, lay out the cables on theguardrail with the shortest distance and route the cables along the guardrail.

l If fiber optic cables need to be routed near a device on the tower, the fiber optic cables aresecured to the guard rail or pole with cable clips and the device cannot be far away fromthe position where fiber optic cables are secured.

l If the fiber optic cables near a device on the tower are too long, the redundant parts mustbe coiled and secured on the tower.

8.2 Cable ConnectionsThis section describes the cable connections for a remote radio unit (RRU).

NOTE

A lower-level RRU obtains power directly from the external power system, instead of from an upper-levelRRU using a power cable.

For details about cable connections between the RRU and an optional device, such as the Remote GlobalPositioning System (RGPS) or the auxiliary filter (AUF), see the instructions for the RGPS or the filter.

Figure 8-8 shows the cable connections for a single RRU when the alarm monitoring functionis performed.



75

Figure 8-8 Cable connections for a single RRU (1)

1. PGND cable 2. RRU RF jumper 3. RRU alarm cable

4. CPRI optical fiber 5. RRU power cable 6. RGPS signal cable

Figure 8-9 shows the cable connections for a single RRU when the RET function is performed.



76

Figure 8-9 Cable connections for a single RRU (2)

1. PGND cable 2. RRU RF jumper 3. RRU AISG multi-core cable

4. RRU AISG extension cable 5. CPRI optical fiber 6. RRU power cable

7. RGPS signal cable

Figure 8-10 shows the cable connections for multiple RRUs when the alarm monitoring functionis performed.



77

Figure 8-10 Cable connections for multiple RRUs (1)

1. PGND cable 2. RRU RF jumper 3. RRU alarm cable

4. CPRI optical fiber/SFP high-speed cable for cascaded RRUs 5. RRU power cable 6. RGPS signal cable

NOTE

If you must cascade two or more RRUs in the same cell, for example, when expanding capacity, install thealarm cable to the last RRU.

Figure 8-11 shows the cable connections for multiple RRUs when the RET function isperformed.



78

Figure 8-11 Cable connections for multiple RRUs (2)

1. PGND cable 2. RRU RF jumper 3. RRU AISG multi-core cable

4. RRU AISG extension cable 5. CPRI optical fiber/SFP high-speed cable forcascaded RRUs

6. RRU power cable

7. RGPS signal cable

8.3 Process of Installing RRU CablesThis section describes how to install remote radio unit (RRU) cables.

Figure 8-12 shows the flowchart for installing RRU cables.



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Figure 8-12 Flowchart for installing RRU cables

8.4 RRU Cable ListThis section describes the cables for the RRU. It also describes the connectors at the two endsof the cables and the cable connections of the RRU.

Table 8-1 lists RRU cables.

Table 8-1 RRU cables

Cable One End The Other End

Connector Connectedto...

Connector Connected to...

RRU PGNDCable

OT terminal(M6)

Groundterminal on theRRU

OT terminal(M8)

Ground terminalon the ground bar



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Cable One End The Other End

Connector Connectedto...

Connector Connected to...

RRU PowerCable

Tool-lessfemaleconnector(pressfit type)

NEG(-) andRTN(+) portson the RRU

Depending onthe power supplyequipment

External powerequipment

CPRI OpticalFiber

DLC connector CPRI0/IR0 porton the RRU

DLC connector CPRI port on theLBBP in theBBU

CPRI1/IR1 porton the RRU

CPRI0/IR0 porton the RRU

RRU RFJumper

Type Nconnector

ANT0 to ANT3ports on theRRU

Type Nconnector

Antenna system

RRU AlarmCable (optional)

DB9waterproofconnector

RET/EXT_ALMport on theRRU

Cord endterminal

External alarmdevice

RGPS SignalCable (optional)

DB15waterproofmale connector

RGPS port onthe RRU

Round 12-pinconnector

RGPS antenna

RRU AISGMulti-WireCable (optional)

DB9waterproofmale connector

RET/EXT_ALMport on theRRU

Standard AISGfemale connector

Standard AISGmale connectoron the RCU or onthe AISGextension cable

RRU AISGExtensionCable (optional)

Standard AISGmale connector

Standard AISGfemaleconnector onthe AISG multi-wire cable

Standard AISGfemale connector

Standard AISGmale connectoron the RCU

8.5 Installing an RRU PGND CableThis section describes how to install the protection ground (PGND) cable for a remote radio unit(RRU).

Procedure

Step 1 Prepare an RRU PGND cable.

1. Cut the cables to the length suitable for the actual cable route.



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2. Add an OT terminal to each end of the cable by referring to Assembling the OT Terminaland the Power Cable.

Step 2 Install the RRU PGND cable.

Connect the M6 OT terminal at one end of the PGND cable to the ground terminal at the bottomof the RRU and the M8 OT terminal at the other end to the external ground bar, as shown inFigure 8-13.

Figure 8-13 Installing an RRU PGND cable

NOTE

Crimp OT terminals in correct directions, as shown in Figure 8-14.

Figure 8-14 Correct direction of an OT terminal



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Step 3 Label the installed PGND cable by referring to Attaching a Cable-Tying Label.

----End

8.6 Installing an RRU RF JumperThis section describes how to install a remote radio unit (RRU) RF jumper.

ContextAn RF jumper connects one of the ports on an RRU and the mapping port on the antenna. Figure8-15 shows the mapping relationship between the RF ports and the antenna ports.

Figure 8-15 Mapping relationship between the RF ports and the antenna ports

NOTE

The labels on ports on the antennas and on the RRU bottom as shown in Figure 8-15 are for referenceonly.

Procedure

Step 1 Remove the dust-proof caps from the ANT ports on the RRU and save the caps for future usage.

Step 2 Connect the Type N connector at one end of each RRU RF jumper to an ANT port on the RRUand use a torque wrench to tighten the connector with a torque of 1 N·m (8.85 lbf·in.), as shownin Figure 8-16.



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Figure 8-16 Installing an RRU RF jumper

NOTICEOn AC-powered electric railways, such as high-speed railways, when leaky cables are connectedto RRUs installed in tunnels, high-voltage-resistance DC blocks must be installed between RRURF jumpers and the leaky cables to protect the RRUs against damage.

Step 3 Connect the other end of the RF jumper to the external antenna system.

Step 4 Waterproof the ANT ports on the RRU, as shown in Figure 8-17.

Figure 8-17 Waterproofing connectors on the RRU RF jumpers



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1. PVC insulation tape 2. Waterproof tape

1. Wrap each connector with one layer of PVC insulation tape from bottom up.2. Wrap each connector with three layers of waterproof tape, first from bottom up, then from

top down, and finally from bottom up. Wrap each layer of tape around the connector tightly.3. Wrap each connector with three layers of PVC insulation tape, first from bottom up, then

from top down, and finally from bottom up. Wrap each layer of tape around the connectortightly.

NOTE

l Before wrapping waterproof tape, stretch the tape evenly until the length of the tape is twice of its originallength. Do not stretch the PVC insulation tape before wrapping.

l Wrap each layer of tape around the connector tightly and ensure that the adhesive surface of the tape overlapsthe lower layer and each layer of tape overlaps more than 50% of the preceding layer.

l Leave an extra length of 3 mm to 5 mm (0.12 in. to 0.20 in.) when cutting the extra part of the cable ties.

Step 5 Do not remove dustproof caps from the RF ports that are not used. The RF ports must bewaterproofed, as shown in Figure 8-18.

Figure 8-18 Waterproofing an RF port equipped with a dustproof cap

1. Dustproof cap 2. PVC insulation tape 3. Waterproof tape

1. Verify that dustproof caps are not removed.2. Wrap each connector with one layer of PVC insulation tape from bottom up.3. Wrap each connector with three layers of waterproof tape, first from bottom up, then from

top down, and finally from bottom up. Wrap each layer of tape around the connector tightly.4. Wrap each connector with three layers of PVC insulation tape, first from bottom up, then

from top down, and finally from bottom up. Wrap each layer of tape around the connectortightly.



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NOTE

l Before wrapping waterproof tape, stretch the tape evenly until the length of the tape is twice of its originallength. Do not stretch the PVC insulation tape before wrapping.

l Wrap each layer of tape around the connector tightly and ensure that the adhesive surface of the tape overlapsthe lower layer and each layer of tape overlaps more than 50% of the preceding layer.

l Leave an extra length of 3 mm to 5 mm (0.12 in. to 0.20 in.) when cutting the extra part of the cable ties.

Step 6 Route the cable by referring to section "Cabling Requirements". Then, use the cable tie to secureit.

Step 7 Label the installed cable by referring to Attaching a Sign Plate Label.

Step 8 Apply color-coding to the installed cable by referring to Attaching the Color Ring.

----End

8.7 (Optional) Installing an RRU Alarm CableThis section describes how to install the alarm cable for a remote radio unit (RRU).

Procedure

Step 1 Connect the DB9 connector at one end of the RRU alarm cable to the RET/EXT_ALM port atthe RRU bottom, as shown in Figure 8-19.

Figure 8-19 Installing an RRU alarm cable

NOTE

Install the waterproof DB15 male connector on the RRU alarm cable with caution, preventing the pinassignment from being damaged.



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Step 2 Connect the eight cord end terminals at the other end of the RRU alarm cable to the alarm device.

NOTE

Use insulating adhesive tapes to wrap cord end terminals that are not in use and fix them at a proper positionbased on the onsite situations. This prevents false alarm reporting and equipment damage due to contactof exposed cables. Figure 8-20 shows the method for handling cord end terminals not in use.

Figure 8-20 Method for handling cord end terminals that are not in use


Step 4 Label the installed cable by referring to Attaching an L-Shaped Label.

----End

8.8 Installing an RRU AISG Multi-Core Cable and an RRUAISG Extension Cable

This section describes how to install a remote radio unit (RRU) AISG multi-core cable and anRRU AISG extension cable. AISG is short for Antenna Interface Standards Group.

ContextWhen the distance between an RRU and a remote control unit (RCU) is longer than 5 m (16.4ft.), an AISG multi-core cable cannot connect the RR and the RCU because it is not long enough.In this case, an AISG extension cable is used to extend the AISG multi-core cable.

Procedurel Install the AISG multi-core cable without installing the AISG extension cable.

1. Connect the waterproof DB9 connector at one end of the AISG multi-core cable tothe RET/EXT_ALM port on the bottom of the RRU, as shown in Figure 8-21.



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Figure 8-21 Installing an RRU AISG multi-core cable

2. Connect the other end of the cable to the standard AISG male connector on the RCU.3. Route the cable by referring to section "Cabling Requirements". Then, use the cable

tie to secure it.4. Label the installed cable by referring to Attaching an L-Shaped Label.

l Install the AISG multi-core cable with an AISG extension cable.1. Connect the waterproof DB9 connector at one end of the AISG multi-core cable to

the RET/EXT_ALM port on the bottom of the RRU, and the other end of the cable tothe standard AISG male connector of the AISG extension cable, as shown in Figure8-22.



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2. Connect the other end of the AISG extension cable to the standard AISG maleconnector on the RCU, as shown in Figure 8-23.


3. Route the cable by referring to section "Cabling Requirements". Then, use the cabletie to secure it.



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4. Label the installed cable by referring to Attaching an L-Shaped Label.

----End

8.9 Opening the Cover Plate of the RRU Cabling CavityThis section describes how to open the cover plate of a remote radio unit (RRU) cabling cavity.

Procedure

Step 1 Wear ESD gloves.

NOTICETake proper ESD protection measures, for example, wear ESD gloves, to prevent electrostaticdamage to the boards, modules, or electronic components.

Step 2 Loosen the protection screw on the cover plate of the RRU cabling cavity and then open thecover plate, as shown in Figure 8-24.

Figure 8-24 Opening the cover plate of the RRU cabling cavity

1. Protection screw

Figure 8-25 shows the RRU cabling cavity.



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Figure 8-25 RRU cabling cavity

1. Cover plate 2. Cable diagram on labels 3. Cable trough for the optical fiber

4. Cable trough for the power cable 5. Waterproof block 6. Clip

7. Cabling cavity - -

Step 3 Loosen the screws on the clip and open the clip, as shown in Figure 8-26.

NOTE

Open the clip only for the associated cable.

Figure 8-26 Opening clips

----End



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8.10 Installing a CPRI Fiber Optic CableThis section describes how to install a CPRI fiber optic cable.

Prerequisites

Before the installation, single-mode optical modules must be distinguished from multi-modeoptical modules in either of the following ways:

l SM and MM labels on an optical module: SM indicates a single-mode optical module, andMM indicates a multi-mode optical module.

l Color of the puller on an optical module: Blue indicates a single-mode optical module, andblack or gray indicates a multi-mode optical module.

NOTICEThe optical modules to be installed must match the rates of their corresponding CPRI ports.

Context

A CPRI fiber optic cable transmits CPRI signals between a BBU and an RRU or between RRUs.

Procedure

Step 1 Lower the pullers of two optical modules, insert one optical module into the CPRI port on theRRU and the other optical module into the CPRI port on the BBU, and raise the pullers, as shownin Figure 8-27.

Figure 8-27 Installing an optical module

NOTICELong-time exposure to the air causes performance exceptions on the optical module. Therefore,the optical module must be connected to fiber optic cables within 20 minutes after beingunpacked.



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Step 2 Connect the end labeled 1A and 1B of the CPRI fiber optic cable to the optical module on theRRU side, as shown in Figure 8-28.

Figure 8-28 Installing a CPRI fiber optic cable

NOTICEThe CPRI fiber optic cable must be installed in the cable clip near the power cable to avoid beingseverely bent. The torque used to screw the cable clips is 1.4 N·m (12.39 lbf·in.).

Step 3 Connect the end labeled 2A and 2B of the CPRI fiber optic cable to the optical module on theBBU side.


Step 5 Label the installed cable by referring to Attaching an L-Shaped Label.

----End

8.11 Installing an RRU power cableThis section describes how to install a remote radio unit (RRU) power cable.

Prerequisites

A tool-less female connector (pressfit type) is added to the RRU power cable on the RRU side.For details, see 11.1 Adding a Tool-less Female Connector (Pressfit Type) to an RRU PowerCable.



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Context

CAUTIONWhen installing the RRU power cable, connect the power cable to the RRU connector first andthen to the power equipment connector. Incorrect connection sequence or reverse connection ofpositive and negative poles may damage the RRU or cause personal injury.

Procedurel Install an RRU power cable that feeds power to an RRU from the DCDU when a DCDU

is configured.

1. Connect the tool-less female connector (pressfit type) at one end of the RRU powercable to the power supply socket on the RRU, as shown in Figure 8-29.

Figure 8-29 Installing an RRU power cable

NOTICEEnsure that the exposed shield layer of the power cable is properly tightened underthe clip.

2. Connect the other end of the RRU power cable to the output terminal on the DCDU.

3. Route the RRU cable following the instructions in "Cabling Requirements" and usecable ties to secure it.

4. Label the installed cable by referring to Attaching a Cable-Tying Label.



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l Install an RRU power cable that feeds power to an RRU from the emergency power supply(EPS) or embedded power subrack unit (EPU) when an EPS or EPU is configured.1. Connect the tool-less female connector (pressfit type) at one end of the RRU power

cable to the power supply socket on the RRU, as shown in Figure 8-29.2. Connect the tool-less female connector (pressfit type) at the other end of the RRU

power cable to one of the ports from RRU0 to RRU5 on the EPS or EPU.NOTE

l The blue core wire in the tool-less female connector (pressfit type) is connected to the leftport on the EPS or EPU, and the black/brown core wire is connected to the right port onthe EPS or EPU.

l Each EPS or EPU provides power for a maximum of six RRUs. An RRU power cable canbe connected to any of the RRU0 to RRU5 ports on the EPS or EPU.

3. Route the RRU cable following the instructions in "Cabling Requirements" and usecable ties to secure it.

4. Label the installed cable by referring to Attaching a Cable-Tying Label.

----End

8.12 Closing the Cover Plate of an RRU Cabling CavityThis section describes how to close the cover plate of a remote radio unit (RRU) cabling cavity.

ProcedureStep 1 Use a torque screwdriver to close clips and tighten the screws on each clip with a torque of 1.4

N·m (12.39 lbf·in.), as shown in Figure 8-30.

Figure 8-30 Closing clips



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NOTICEEnsure that the exposed shield layer of the DC power cable is properly tightened under the clip.

Step 2 Insert waterproof blocks into vacant cable troughs in the cabling cavity, as shown in Figure8-31. The operation is based on the cable installation, and the following is for reference only.

Figure 8-31 Checking waterproof blocks

Step 3 Use a torque screwdriver to close the cover plate of the RRU cabling cavity and tighten thescrews on the cover plate with a torque of 0.8 N·m (7.08 lbf·in.), as shown in Figure 8-32.

Figure 8-32 Closing the cover plate of the RRU cabling cavity

1. Protection screw



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NOTICEBefore tightening the screws on the cover plate, ensure that cables and waterproof blocks areproperly inserted into troughs.

Step 4 Take off the ESD gloves, and pack up all the tools.

----End



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9 Checking the RRU Hardware Installation

This chapter describes how to check the hardware installation after a remote radio unit (RRU)is installed.

Table 9-1 provides the checklist for the RRU hardware installation.

Table 9-1 Checklist for the RRU hardware installation

No. Item

1 The installation position of each device strictly complies with the engineeringdesign and meets clearance requirements. Sufficient space is reserved for equipmentmaintenance.

2 The RRU is securely installed.

3 The cover plate is securely installed on the RRU cabling cavity.

4 Waterproof blocks are securely installed in vacant cable troughs of the RRU cablingcavity, and the cover plate for the cabling cavity is securely installed. In addition,vacant RF ports are covered with dustproof caps and the caps are tightened.

5 There must be no connectors or joints on each power cable or PGND cable.

6 The terminals at both ends of the power cable or PGND cable are securely solderedor crimped.

7 The power cable or the PGND cable are intact and correctly connected. They arenot short-circuited.

8 Power cables and PGND cables are separately bound from other cables.

9 The protection grounding of the RRU and the surge protection grounding of thebuilding share one group of ground conductors.

10 The connectors of each signal cable are intact and securely connected, and thesecables are not damaged or broken.

11 Labels are correct, legible, and complete at both ends of each cable, feeder, andjumper.

RRU3252(DC)&RRU3256(DC)Installation Guide 9 Checking the RRU Hardware Installation


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10 Checking the Power-on Status of an RRU

This chapter describes how to check the power-on status of a remote radio unit (RRU) after allthe devices are installed.

NOTICEAfter you unpack an RRU, power it on within 24 hours. If you power off the RRU formaintenance, restore it to power within 24 hours.

Figure 10-1 shows the RRU power-on check process.

RRU3252(DC)&RRU3256(DC)Installation Guide 10 Checking the Power-on Status of an RRU


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Figure 10-1 RRU power-on check process

NOTE

l The status of the RUN indicator is on for 1s and off for 1s, and the ALM indicator is steady off.

l The normal input voltage of a DC RRU is -48 V DC. The voltage of the external power supply shouldrange from -32 V DC to -60 V DC.

RRU3252(DC)&RRU3256(DC)Installation Guide 10 Checking the Power-on Status of an RRU


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11 Appendix

About This Chapter

This section describes how to add a tool-less female connector (pressfit type).

11.1 Adding a Tool-less Female Connector (Pressfit Type) to an RRU Power CableThis section describes how to add a tool-less female connector (pressfit type) to the remote radiounit (RRU) power cable on the RRU side.

RRU3252(DC)&RRU3256(DC)Installation Guide 11 Appendix


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11.1 Adding a Tool-less Female Connector (Pressfit Type) toan RRU Power Cable

This section describes how to add a tool-less female connector (pressfit type) to the remote radiounit (RRU) power cable on the RRU side.

Procedure

Step 1 Open the cabling cavity and take out the tool-less female connector (pressfit type). Then, markthe lengths of the power cable for different operations based on the label on the cover of thecabling cavity, as shown in Figure 11-1.

Figure 11-1 Marking the lengths of the power cable for different operations

Step 2 Use a cable cutter and wire stripper to strip off the specified length of the sheath from the powercable, as shown in Figure 11-2.

Figure 11-2 Stripping the sheath off the power cable

Step 3 Strip off the sheath from each core wire, as shown in Figure 11-3.

Figure 11-3 Stripping the sheath off each core wire



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NOTE

Ensure that the length of the sheath stripped off from each core wire must match the length of the notch inthe tool-less female connector (pressfit type), as shown in Figure 11-4.

Figure 11-4 Stripping an FE/GE Ethernet cable

Step 4 Strip off the sheath from the power cable to expose its shield layer, as shown in Figure 11-5.

Figure 11-5 Stripping off the sheath from the power cable to expose its shield layer

Step 5 Use a Phillips screwdriver to loosen the screws, as shown in Figure 11-6.

Figure 11-6 Tightening screws



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Step 6 Connect the blue core wire labeled NEG(-) to the - port and connect the black core wire labeledRTN(+) to the + port on the tool-less female connector (pressfit type). Then, tighten the screwsusing a Phillips screwdriver, and then use a torque screwdriver to tighten the M4 screws to 1.4N·m (12.39 lbf·in.), as shown in Figure 11-7.

DANGERDo not reversely connect the positive and negative poles. Reverse connection of positive andnegative poles may result in equipment malfunctions or personal injury. Therefore, check thepower cable connection before powering on the RRU.

Figure 11-7 Adding a tool-less female connector (pressfit type) to two core wires

Each core wire is exposed outside the tool-less female connector (pressfit type) for 1.5 mm (0.06in.), as shown in Figure 11-8.

Figure 11-8 Tool-less female connectors (pressfit type) installed in different ways



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NOTICEIf the wire connections are incorrect, the equipment cannot be powered on. Correctly connectthe wires 10 seconds later.

Step 7 Confirm that the core wires are securely connected to the connector, as shown in Figure 11-9.

Figure 11-9 Tool-less female connector (pressfit type)

----End



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