Huawei Technologies RRU3256-2500 Remote Radio Unit User Manual RRU3252 RRU3256 Installation Guide

Huawei Technologies Co.,Ltd Remote Radio Unit RRU3252 RRU3256 Installation Guide

RRU3256 Installation Guide-EN

DBS3900

V100R005C00

RRU3252/RRU3256 Installation

Guide

Issue Draft A

Date 2012-11-30

HUAWEI TECHNOLOGIES CO., LTD.

No part of this document may be reproduced or transmitted in any form or by any means without prior written

consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice

The purchased products, services and features are stipulated by the contract made between Huawei and the

customer. All or part of the products, services and features described in this document may not be within the

purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,

and recommendations in this document are provided "AS IS" without warranties, guarantees or representations

of any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in the

preparation of this document to ensure accuracy of the contents, but all statements, information, and

recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base

Bantian, Longgang

Shenzhen 518129

People's Republic of China

Website: http://www.huawei.com

Email: support@huawei.com

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About This Document

Purpose

This document describes the process of installing a DC RRU3252/RRU3256 (referred to as RRU

in this document).

Product Version

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

Product Name Product Version

DBS3900 LTE TDD V100R005C00 and later versions

Intended Audience

This document is intended for:

Base station installation engineers

Organization

1 Change History

This chapter describes changes in the RRU3252/RRU3256 Installation Guide.

2 Installation Preparations

This chapter describes the reference documents, tools, and instruments that must be ready before

the installation. In addition, it specifies the skills that installation engineers must have.

3 Information About the Installation

Before installing an RRU, you must be familiar with its exterior, ports, installation options,

physical supports, and installation clearance requirements.

4 Unpacking the Equipment

This chapter describes how to unpack and check the delivered equipment to ensure that all the

materials are included and intact.

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5 Installation Process

The installation process involves installing an RRU 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 RRU and Cables onto a tower and provides important

notes about the installation.

7 Installing the RRU

This chapter describes the procedure for installing the RRU. The RRU can be installed on a pole,

U-steel, angle steel, or wall as required.

8 Installing RRU Cables

This chapter describes the procedure for installing RRU cables.

9 Checking the RRU Hardware Installation

This section describes how to check RRU hardware installation after the installation is complete.

10 Powering On an RRU

This section describes how to check the power-on status of an RRU after all the devices are

installed.

11 Appendix

This section describes the procedure for adding an easy power receptacle (pressfit type)

connector.

Conventions

Symbol Conventions

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

Symbol Description

Indicates a hazard with a high level of risk, which if not

avoided, will result in death or serious injury.

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

if not avoided, could result in minor or moderate injury.

Indicates a potentially hazardous situation, which if not

avoided, could result in equipment damage, data loss,

performance degradation, or unexpected results.

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

time.

Provides additional information to emphasize or supplement

important points of the main text.

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iii

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 in

boldface. For example, log in as user root.

Italic Book titles are in italics.

Courier New Examples of information displayed on the screen are in

Courier New.

Command Conventions

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

Convention Description

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 by

vertical bars. One item is selected.

[ x | y | ... ] Optional items are grouped in brackets and separated by

vertical bars. One item is selected or no item is selected.

{ x | y | ... }*Optional items are grouped in braces and separated by

vertical bars. A minimum of one item or a maximum of all

items can be selected.

[ x | y | ... ]*Optional items are grouped in brackets and separated by

vertical 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.

Convention Description

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

are in boldface. For example, click OK.

>Multi-level menus are in boldface and separated by the ">"

signs. For example, choose File > Create > Folder.

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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 means

the 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 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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Contents

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

1 Change History..............................................................................................................................1

2 Installation Preparations..............................................................................................................2

2.1 Reference Documents.........................................................................................................................................3

2.2 Tools and Instruments........................................................................................................................................3

2.3 Skills and Requirements for Onsite Personnel...................................................................................................4

3 Information About the Installation...........................................................................................5

3.1 RRU Exterior......................................................................................................................................................6

3.2 RRU Ports...........................................................................................................................................................7

3.3 RRU Indicators...................................................................................................................................................8

3.4 Installation Options...........................................................................................................................................10

3.5 Installation Clearance Requirements of an RRU..............................................................................................15

3.5.1 Clearance for a Single RRU....................................................................................................................15

3.5.2 Clearance for Multiple RRUs..................................................................................................................17

3.5.3 Spacing Between RRUs...........................................................................................................................20

4 Unpacking the Equipment.........................................................................................................23

5 Installation Process.....................................................................................................................25

6 Hoisting the RRU and Cables onto a Tower..........................................................................26

6.1 Hoisting an RRU onto a Tower........................................................................................................................27

6.2 Hoisting Fiber Optic Cables onto a Tower.......................................................................................................31

6.3 Hoisting Power Cables onto a Tower...............................................................................................................33

7 Installing the RRU.......................................................................................................................37

7.1 Mounting Kits for an RRU...............................................................................................................................38

7.2 Installing the RRU on a Pole............................................................................................................................38

7.2.1 Installing a Single RRU...........................................................................................................................43

7.2.2 Installing Two RRUs...............................................................................................................................46

7.2.3 Installing Multiple RRUs.........................................................................................................................48

7.3 Installing the RRU on U-Steel..........................................................................................................................53

7.4 Installing the RRU on Angle Steel...................................................................................................................57

7.5 Installing the RRU on a Wall...........................................................................................................................60

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8 Installing RRU Cables................................................................................................................65

8.1 Cabling Requirements......................................................................................................................................67

8.2 Cable Connections............................................................................................................................................72

8.3 Installation Process...........................................................................................................................................75

8.4 RRU Cable List................................................................................................................................................76

8.5 Installing an RRU PGND Cable.......................................................................................................................78

8.6 Installing an RRU RF Jumper..........................................................................................................................79

8.7 Installing an RRU Alarm Cable........................................................................................................................82

8.8 Installing an RRU AISG Multi-Wire Cable and an RRU AISG Extension Cable...........................................83

8.9 Opening the Cover Plate of an RRU Cabling Cavity.......................................................................................86

8.10 Installing an RRU Power Cable......................................................................................................................88

8.11 Installing an Optical Fiber Cable ...................................................................................................................89

8.12 Closing the Cover Plate of an RRU Cabling Cavity......................................................................................91

9 Checking the RRU Hardware Installation..............................................................................94

10 Powering On an RRU...............................................................................................................95

11 Appendix.....................................................................................................................................97

11.1 Adding an Easy Power Receptacle (Pressfit Type) Connector to an RRU Power Cable...............................98

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1 Change History

This chapter describes changes in the RRU3252/RRU3256 Installation Guide.

Draft A (2012-11-30)

This is a draft.

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2 Installation Preparations

About This Chapter

This chapter describes the reference documents, tools, and instruments that must be ready before

the installation. In addition, it specifies the skills that installation engineers must have.

2.1 Reference Documents

Before the installation, you must be familiar with reference documents.

2.2 Tools and Instruments

All tools and instruments required for RRU installation must be ready before the installation.

2.3 Skills and Requirements for Onsite Personnel

Onsite personnel must be qualified and trained. Before performing any operation, onsite

personnel must be familiar with correct operation methods and safety precautions.

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2.1 Reference Documents

Before the installation, you must be familiar with reference documents.

The following reference documents are required during RRU installation:

lRRU3252/RRU3256 Hardware Description

lDBS3900 Installation Guide

lOCB-01M User Guide

This document describes the RRU installation on a pole, U-steel, angle steel, or wall. If RRUs

are installed on the IFS06, the following reference document is required:

lDBS3900 (ICR) Installation Guide

2.2 Tools and Instruments

All tools and instruments required for RRU installation must be ready before the installation.

Hammer drill (φ 12 bit to φ

14 bit)

Electrostatic discharge

(ESD) gloves

Vacuum cleaner

Heat gun Phillips screwdriver (M3 to

M6)

Flat-head screwdriver (M3 to

M6)

Rubber mallet Hydraulic pliers Wire stripper

Utility knife Cable cutter Level

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Adjustable wrench (capacity

≥ 32 mm)

Torque wrench

Capacity: 17 mm, 21 mm,

and 32 mm

Combination wrench

Capacity: 17 mm, 21 mm,

and 32 mm

Torque screwdriver

5 mm

(M3 to M6)

Torque socket

Multimeter Marker (diameter ≤ 10 mm) Measuring tape

2.3 Skills and Requirements for Onsite Personnel

Onsite personnel must be qualified and trained. Before performing any operation, onsite

personnel must be familiar with correct operation methods and safety precautions.

Before the installation, pay attention to the following items:

lThe customer's technical engineers must be trained by Huawei and be familiar with the

proper installation and operation methods.

lThe number of onsite personnel depends on the engineering schedule and installation

environment. Generally, only three to five onsite personnel are necessary.

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3 Information About the Installation

About This Chapter

Before installing an RRU, you must be familiar with its exterior, ports, installation options,

physical supports, and installation clearance requirements.

3.1 RRU Exterior

This section describes the exterior and dimensions of an RRU.

3.2 RRU Ports

This section describes ports on the RRU panels. An RRU has a bottom panel, cabling cavity

panel, and indicator panel.

3.3 RRU Indicators

This section describes six indicators on an RRU. They indicate the running status.

3.4 Installation Options

This section describes RRU installation options. An RRU can be installed on a pole, U-steel,

angle steel, or wall.

3.5 Installation Clearance Requirements of an RRU

This section describes the requirements for the installation clearance of a single RRU and

multiple RRUs and the requirements for the installation spacing between RRUs.

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3.1 RRU Exterior

This 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 Ports

This section describes ports on the RRU panels. An 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 Label Description

(1) Ports at the bottom ANT0-ANT3 TX/RX ports. ANT0 port supports RET signal

transmission.

RET/EXT_ALM Communication port for the RET antenna or

port for alarm reporting, supporting RET

signal transmission

RGPS RGPS port, which is optional.

(2) Ports in the cabling

cavity

CPRI0/IR0 Optical port

CPRI1/IR1

RTN(+) Power supply socket

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.

The RET ports to be used are determined by the software configuration.

3.3 RRU Indicators

This section describes six indicators on an RRU. They indicate the running status.

For the specific positions of RRU indicators, see 3.2 RRU Ports.

Table 3-2 describes RRU indicators.

Table 3-2 Indicators on the RRU

Label Color Status Description

RUN Green Steady on There is power supply, but the module

is faulty.

Steady off There is no power supply, or the

module is faulty.

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Label Color Status Description

Blinking on for 1s and off

for 1s

The module is working properly.

Blinking on for 0.125s and

off for 0.125s

Software is being loaded to the

module, or the module is not started.

ALM Red Steady on Alarms are generated, and the module

must be replaced.

Steady off No alarm is generated.

Blinking on for 1s and off

for 1s

Alarms are generated. The alarms

may be caused by the faults on the

related modules or ports. Therefore,

the necessity for module replacement

is uncertain.

ACT Green Steady on The module is working properly with

TX channels enabled or software is

being loaded without RRU running.

Blinking on for 1s and off

for 1s

The module is working properly with

TX channels disabled.

VSWR Red Steady off No VSWR alarm is generated.

Steady on A VSWR alarm is generated.

CPRI0/

IR0

Red or

green

Steady green The CPRI link is functioning

properly.

Steady red An optical module fails to transmit or

receive signals possibly because the

optical module is faulty or the optical

fiber cable is broken.

Blinking red on for 1s and

off for 1s

The CPRI link is out of lock possibly

because of mutual lock of dual-mode

clock sources or mismatched data

rates over CPRI ports. (You are

advised to check the system

configuration to rectify the fault.)

Steady off The SFP module is not properly

installed, or the optical module is

powered off.

CPRI1/

IR1

Red or

green

Steady green The CPRI link is functioning

properly.

Steady red An optical module fails to transmit or

receive signals possibly because the

optical module is faulty or the optical

fiber cable is broken.

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Label Color Status Description

Blinking red on for 1s and

off for 1s

The CPRI link is out of lock possibly

because of mutual lock of dual-mode

clock sources or mismatched data

rates over CPRI ports. (You are

advised to check the system

configuration to rectify the fault.)

Steady off The SFP module is not properly

installed, or the optical module is

powered off.

3.4 Installation Options

This section describes RRU installation options. An RRU can be installed on a pole, U-steel,

angle steel, or wall.

Installing an RRU on a Pole

Figure 3-4 shows the diameter of a metal pole for installing an RRU.

Figure 3-4 Diameter of a pole

CAUTION

lThe 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.).

lIf the diameter of a pole ranges from 60 mm to 76 mm (2.36 in. to 2.99 in.), a maximum of

three RRUs can be installed on the pole and the side-mounted installation must not be

adopted.

lIf three or more RRUs must be installed on a pole in centralized mode, the diameter of the

pole must range from 76 mm to 114 mm (2.99 in. to 4.49 in.).

lThe recommended pole thickness is 3.5 mm (0.14 in.) or thicker.

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Figure 3-5 shows an RRU installed on a pole.

Figure 3-5 RRU installed on a pole

Installing an RRU on U-steel

CAUTION

lYou are advised to install only one RRU on the same U-steel or angle steel.

lThe angle between the vertical plane and the pole, angle steel, or U-steel must be smaller

than or equal to 10°, as shown in Figure 3-6.

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Figure 3-6 Requirement of the angle between the ground and the pole, angle steel, or U-steel

(1) RRU (2) Pole, angle steel, or U-steel

Figure 3-7 shows U-steel specifications.

Figure 3-7 U-steel specifications

Figure 3-8 shows an RRU installed on U-steel.

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Figure 3-8 RRU installed on U-steel

Installing an RRU on Angle Steel

Figure 3-9 shows angle steel specifications.

Figure 3-9 Angle steel specifications

CAUTION

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

lThe vertical deviation angle of angle steel must be less than or equal to 10°, as shown in

Figure 3-6.

Figure 3-10 shows an RRU installed on angle steel.

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Figure 3-10 RRU installed on angle steel

Installing an RRU on a Wall

The wall on which RRUs are installed must meet the following requirements:

lWhen a single RRU is installed, the wall has a capacity of bearing at least four times the

weight of the RRU.

lExpansion 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.

CAUTION

The brackets must not be combined when RRUs are installed on a wall.

Figure 3-11 shows an RRU installed on a wall.

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Figure 3-11 RRU installed on a wall

3.5 Installation Clearance Requirements of an RRU

This section describes the requirements for the installation clearance of a single RRU and

multiple RRUs and the requirements for the installation spacing between RRUs.

NOTE

The recommended installation clearance ensures normal running and provides an appropriate space for

OM. If there is sufficient space, leave the recommended installation clearance.

The minimum installation clearance ensures normal running and heat dissipation, but OM activities such

as checking indicator status and opening the maintenance cavity cannot be properly conducted. If the

installation space is restricted, leave the minimum installation clearance.

3.5.1 Clearance for a Single RRU

This section describes the recommended and minimum clearance for a single RRU.

Recommended Clearance for a Single RRU

Figure 3-12 shows the recommended clearance for a single RRU.

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Figure 3-12 Recommended clearance for a single RRU

Minimum Clearance for a Single RRU

Figure 3-13 shows the minimum clearance for a single RRU.

Figure 3-13 Minimum clearance for a single RRU

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Minimum Clearance for a Single RRU Installed on a Tower

Figure 3-14 shows the minimum clearance for a single RRU installed on a tower.

Figure 3-14 Minimum clearance for a single RRU installed on a tower

3.5.2 Clearance for Multiple RRUs

This section describes the recommended and minimum clearance for multiple RRUs.

Recommended Clearance for Multiple RRUs Installed in Centralized Mode

Figure 3-15 shows the recommended clearance for multiple RRUs installed in centralized mode.

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Figure 3-15 Recommended clearance for multiple RRUs installed in centralized mode

Minimum Clearance for Multiple RRUs Installed in Centralized Mode

Figure 3-16 shows the minimum clearance for multiple RRUs installed in centralized mode.

Figure 3-16 Minimum clearance for multiple RRUs installed in centralized mode

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Recommended clearance for multiple RRUs installed on a wall in standard mode

Figure 3-17 shows the recommended clearance for multiple RRUs installed on a wall in standard

mode.

Figure 3-17 Recommended clearance for multiple RRUs installed on a wall in standard mode

Minimum clearance for multiple RRUs installed on a wall in standard mode

Figure 3-18 shows the minimum clearance for multiple RRUs installed on a wall in standard

mode.

Figure 3-18 Minimum clearance for multiple RRUs installed on a wall in standard mode

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Recommended Clearance for Multiple RRUs Side-Mounted on a Wall

Figure 3-19 shows the recommended clearance for multiple RRUs side-mounted on a wall.

Figure 3-19 Recommended clearance for multiple RRUs side-mounted on a wall

3.5.3 Spacing Between RRUs

This section describes the horizontal and vertical installation spacing between RRUs.

Recommended horizontal spacing between RRUs

Figure 3-20 shows the recommended horizontal spacing between RRUs.

Figure 3-20 Recommended horizontal spacing between RRUs

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Minimum horizontal spacing between RRUs

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

Figure 3-21 Minimum horizontal spacing between RRUs

Recommended vertical spacing between RRUs

Figure 3-22 shows the recommended vertical spacing between RRUs.

Figure 3-22 Recommended vertical spacing between RRUs

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Minimum vertical spacing between RRUs

Figure 3-23 shows the minimum vertical spacing between RRUs.

Figure 3-23 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 the

materials are included and intact.

Context

NOTE

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

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

lWear clean gloves, and avoid touching the equipment, components, or parts with bare hands, sweat-

soaked gloves, or dirty gloves.

CAUTION

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

lAfter 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 packing

list

Go to Step 2.

The total number does not tally with the

packing list

Find out the cause and report any missing

articles to the local Huawei office.

Step 2 Check the exterior of the packing case.

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If ... Then ...

The outer packing is intact Go to Step 3.

The outer packing is severely damaged or

soaked

Find out the cause and report it to the local

Huawei office.

The shockwatch label is red Stop unpacking the wooden crate, and then

report it to the transportation company.

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 with

those on the packing list

Sign the Packing List with the customer.

Either shipment shortage, wrong shipment

or damaged articles.

Report to the local Huawei office.

WARNING

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 file the

photos.

----End

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5 Installation Process

The installation process involves installing an RRU and RRU cables, checking the RRU

hardware installation, and powering on the RRU.

Figure 5-1 shows the process of installing an RRU.

Figure 5-1 Process of installing an RRU

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6 Hoisting the RRU and Cables onto a Tower

About This Chapter

This section describes how to hoist the RRU and Cables onto a tower and provides important

notes about the installation.

6.1 Hoisting an RRU onto a Tower

This section describes the procedures and precautions for hoisting an RRU and its mounting kits

onto a tower. In tower-mounted scenario, the RRU can be installed on a pole, U-steel, or angle

steel.

6.2 Hoisting Fiber Optic Cables onto a Tower

This section describes the procedure for hoisting fiber optic cables onto a tower and the

precautions that must be taken.

6.3 Hoisting Power Cables onto a Tower

This section describes the procedure for hoisting power cables onto a tower and the precautions

that must be taken.

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6.1 Hoisting an RRU onto a Tower

This section describes the procedures and precautions for hoisting an RRU and its mounting kits

onto a tower. In tower-mounted scenario, the RRU can be installed on a pole, U-steel, or angle

steel.

Prerequisites

Place a foam pad or cardboard on the ground to protect the housing of the RRU from damage

before the binding. Do not stand the RRU upright because the load-bearing capacity of the RF

ports at the RRU bottom is low.

CAUTION

When installed on a tower, only one RRU can be installed in standard mode or reverse mode,

and two RRUs can be installed on a pole in back-to-back mode. RRUs cannot be installed on a

tower with its side mounted, and the brackets for more than two RRUs cannot be combined.

Procedure

Step 1 Hoist the RRU and mounting kits onto the tower respectively, as shown in Figure 6-1.

NOTE

Hoist mounting kits onto the tower and then install the mounting kits before hoisting the RRU onto the

tower. When hoisting the mounting kits and RRU, protect them from colliding with the tower.

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Figure 6-1 Hoisting the RRU onto the tower

(1) Lifting sling (2) Fixed pulley (3) Traction sling

1. After climbing up to the tower, installation engineer A secures the fixed pulley to the tower

platform support and leads the lifting sling through the fixed pulley.

2. Installation engineer C binds the RRU mounting kits properly using a lifting sling, as shown

in Figure 6-2, and binds the RRU using a lifting sling and a traction sling, as shown in

Figure 6-3.

Figure 6-2 Binding mounting kits for the RRU

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Figure 6-3 Binding the RRU

(1) Lifting sling (2) Lifting eye (3) Traction sling (4) Handle

CAUTION

lThe 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 the

lifting sling [by the knot] must not be greater than 60 degrees.

lWhen hoisting the RRU and mounting kits onto the tower, protect them from colliding

with the ground and tower.

lHoist the RRU onto the tower before it is installed on a pole, angle steel, or U-steel.

lDo not hoist the RRU by the handle or lifting eye only, as shown in Figure 6-4 and

Figure 6-5.

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Figure 6-4 Incorrect binding method

Figure 6-5 Incorrect binding method

3. Installation engineer B pulls the lifting sling downwards, and installation engineer C pulls

the traction sling outwards to protect the RRU from colliding with the tower.

Step 2 Installation engineer A catches the RRU, install the RRU on the main bracket until the RRU

snaps shut.

Step 3 Remove the lifting sling and traction sling.

NOTE

The procedure for hoisting the RRU and mounting kits onto the tower is for your reference only.

----End

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6.2 Hoisting Fiber Optic Cables onto a Tower

This section describes the procedure for hoisting fiber optic cables onto a tower and the

precautions that must be taken.

Context

Cabling requirements for power 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 fiber optic cables onto the tower

(1) Lifting sling (2) Fixed pulley (3) Traction sling

CAUTION

Before hoisting fiber optic cables onto the tower, connect the fiber optic cables to the RRU or

BBU based on the labels on both ends of the cables and determine the hoisting direction.

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1. After climbing up to the tower, installation engineer A secures the fixed pulley to the tower

platform support and leads the lifting sling through the fixed pulley.

2. Installation engineer B places the fiber coiler for coiling fiber optic cables on the fiber

spools, and installation engineer D lead the lifting sling through the stretch sling of the fiber

optic cables and use the other sling as a traction sling to secure the cables 4 m (13.12 ft)

away from the lifting sling, as shown in Figure 6-7.

Figure 6-7 Binding fiber optic cables

(1) Lifting sling (2) Stretch sling (3) Traction sling

CAUTION

Do not remove the stretch sling and protection pipe or bind fiber optic cables using one

sling, as shown in Figure 6-8.

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Figure 6-8 Incorrect binding method

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

ft) per minute to coil the fiber optic cables.

4. Installation engineer C pulls the lifting sling downwards, and installation engineer 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

The procedure for hoisting the fiber optic cables onto the tower is for your reference only.

----End

6.3 Hoisting Power Cables onto a Tower

This section describes the procedure for hoisting power cables onto a tower and the precautions

that must be taken.

Context

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

The procedure for adding a connector to the RRU power cable on the RRU side is done under

the tower.

Procedure

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

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Figure 6-9 Hoisting power cables onto the tower

(1) Lifting sling (2) Fixed pulley

1. After climbing up to the tower, installation engineer A secures the fixed pulley to the tower

platform support and leads the lifting sling through the fixed pulley.

2. Installation engineer B secures three cable ties to the power cable connector, and then

secures 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 vary

according to the situation.

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Figure 6-10 Binding cable ties

3. Installation engineer 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 it

reaches the other end of the connector. The total length of the wrapped connector is 100 mm (3.94

in.).

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Figure 6-11 Wrapping the PVC insulation tape

4. Installation engineer C pulls the lifting sling downwards, and installation engineer B pulls

the other end of the lifting 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 cable ties, PVC insulation tape, and lifting sling.

NOTE

The procedure for hoisting the power cables onto the tower is for your reference only.

----End

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7 Installing the RRU

About This Chapter

This chapter describes the procedure for installing the RRU. The RRU can be installed on a pole,

U-steel, angle steel, or wall as required.

CAUTION

lDo not stand the RRU upright because the load-bearing capacity of the RF ports at the RRU

bottom is low.

lPlace a foam pad or cardboard under an RRU to protect the RRU housing from damage

during the installation.

7.1 Mounting Kits for an RRU

This section describes the bracket assembly and the attachment plate for an RRU.

7.2 Installing the RRU on a Pole

This section illustrates the installation of one or more RRUs on a pole.

7.3 Installing the RRU on U-Steel

This section describes the procedure for installing the RRU on U-steel and the precautions that

must be taken during the installation. The RRU installed on U-steel can be mounted to a tower

or placed on the ground. It is recommended that only one RRU be installed on U-steel.

7.4 Installing the RRU on Angle Steel

This section describes the procedure for installing the RRU on angle steel and the precautions

that must be taken during the installation. The RRU installed on angle steel can be mounted to

a tower or placed on the ground. It is recommended that only one RRU be installed on angle

steel.

7.5 Installing the RRU on a Wall

This section describes the procedure for installing the RRU on a wall and the precautions that

must be taken during the installation.

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7.1 Mounting Kits for an RRU

This section describes the bracket assembly and the attachment plate for an RRU.

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

Figure 7-1 Bracket assembly for an RRU

(1) Plastic screw cap (2) M10 nut (3) Spring washer (4) Flat washer

(5) M10x150 bolt (6) Auxiliary mounting

bracket

(7) Hoist clamp on the main

mounting bracket

(8) Main mounting 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 the RRU on a Pole

This section illustrates the installation of one or more RRUs on a pole.

Figure 7-3 shows a single RRU installed on a pole.

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Figure 7-3 Single RRU installed on a pole

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

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Figure 7-4 Two RRUs installed on a pole

NOTE

If two RRUs are installed on a pole, the minimum distance between the two sets of mounting kits is the

height of an RRU.

Figure 7-5, Figure 7-6, and Figure 7-7 show multiple RRUs installed on a pole.

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Figure 7-5 Three RRUs installed on a pole in centralized mode

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Figure 7-6 Four RRUs installed on a pole in centralized mode

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Figure 7-7 Six RRUs installed on a pole in centralized mode

7.2.1 Installing a Single RRU

This section describes the procedure for installing a single RRU on a pole and the precautions

that must be taken during 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 Hoisting an RRU onto a Tower.

The hoist clamp on the main mounting bracket is secured properly.

Procedure

Step 1 Determine a position for installing the main mounting bracket.

lIf the RRU must be installed on a tower, see 3.5.1 Clearance for a Single RRU to determine

a position.

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

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

Step 2 Manually loosen the two M10 nuts on the mounting kits counterclockwise, horizontally remove

one end of the M10x150 bolt from the U notch on the auxiliary mounting bracket, and then

disassemble the mounting kits, as shown in Figure 7-9.

Figure 7-9 Removing the M10x150 bolt from the U notch

Step 3 Install the bracket assembly on a pole. Then, place the removed end of the bolt into the U notch,

as shown in Figure 7-10.

Figure 7-10 Bracket assembly installed on a pole

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Step 4 To secure the bracket assembly to the pole, use a torque wrench with an aperture of 16 mm (0.67

in.) to tighten the two M10 nuts with a torque of 40 N·m (354.03 lbf·in.), as shown in Figure

7-11.

Figure 7-11 Securing the bracket assembly

(1) Plastic screw cap

NOTE

Do not remove the plastic screw caps from the bolts on the mounting kits.

Step 5 Install the RRU on the main mounting bracket until the RRU snaps shut, as shown in Figure

7-12.

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Figure 7-12 Installing the RRU on the main mounting bracket

----End

7.2.2 Installing Two RRUs

This section describes the procedure for installing two RRUs on a pole and the precautions that

must be taken during 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

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Step 2 Install the second set of mounting kits, The distance between the two sets of mounting kits must

equal the height of an RRU.

Step 3 Remove the attachment plate from the rear of the second RRU and then install it on the RRU

front, as shown in Figure 7-14.

Figure 7-14 Removing the attachment plate from the rear of the second RRU and then installing

it on the RRU front

1. Remove the attachment plate from the RRU rear using an inner hexagon screwdriver.

2. Install the attachment plate to the RRU front, and tighten the stainless steel screws on the

attachment plate with a torque of 4.8 N·m (44.25 lbf·in.) using a torque screwdriver.

Step 4 Install the second RRU on the main mounting bracket, as shown in .

NOTE

When you install two RRUs in back-to-back mode, ensure that the cabling cavities of these two RRUs face

the same direction.

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Figure 7-15 Installing the second RRU on the main mounting bracket

(1) RRU installed in standard mode (2) RRU installed in reverse mode (3) Cabling cavity

----End

7.2.3 Installing Multiple RRUs

This section describes the procedure for installing multiple remote radio units (RRUs) on a pole

and the precautions that must be taken during the installation.

Context

Three, four, or six RRUs can be installed on a pole. The procedures for installing them are 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 RRU rear, and install it on one side of the RRU, as shown

in Figure 7-16. (Repeat this step to change the positions of all the other attachment plates of the

RRU.)

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Figure 7-16 Removing an attachment plate from the RRU rear and installing it on one side of

the RRU

1. Use an inner hexagon screwdriver to remove the attachment plate from the RRU rear.

2. Install the attachment plate on one 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 mounting bracket in the first set of mounting kits, as shown in

Figure 7-17.

Figure 7-17 Installing the first RRU on the main mounting bracket

Step 4 Install the second main mounting bracket on the side of the first main mounting bracket, as

shown in Figure 7-18.

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Figure 7-18 Installing the second main mounting bracket

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

Figure 7-19 Installing the second RRU on the main mounting bracket

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

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

Step 7 Install the second set of mounting kits, as shown in Figure 7-21. The minimum distance between

the two sets of mounting kits is the height of an RRU.

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Figure 7-21 Installing the second set of mounting kits

Step 8 Install the fourth RRU on the main mounting bracket of the second set of mounting kits, as shown

in Figure 7-22.

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

----End

7.3 Installing the RRU on U-Steel

This section describes the procedure for installing the RRU on U-steel and the precautions that

must be taken during the installation. The RRU installed on U-steel can be mounted to a tower

or placed on the ground. It is recommended that only one RRU be installed on U-steel.

Prerequisites

Before you install an RRU on a tower, the RRU and mounting kits are hoisted onto the tower.

For details, see 6.1 Hoisting an RRU onto a Tower.

The hoist clamp on the main mounting bracket is secured properly.

Context

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

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Figure 7-23 Top view of the RRU

(1) U-steel

NOTE

If the length of the narrow side of U-steel is less than 40 mm (1.57 in.), install an RRU in mode a or mode

b shown in Figure 7-23.

Procedure

Step 1 Determine a position for installing the main mounting bracket.

lIf the RRU is to be installed on a tower, determine the position for installing the main

mounting bracket by referring to 3.5.1 Clearance for a Single RRU.

lIf the RRU is to be installed on the ground, determine the position for installing the main

mounting bracket by referring to Figure 7-24.

Figure 7-24 Distance between the main mounting bracket and the ground

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NOTE

It is recommended that the main mounting bracket be 1200 mm to 1600 mm (47.24 in. to 62.99 in.)

above the ground.

Step 2 Manually loosen the two M10 nuts on the mounting kits counterclockwise, horizontally remove

one end of the M10x150 bolt from the U notch on the auxiliary mounting bracket, and then

disassemble the mounting kits, as shown in Figure 7-25.

Figure 7-25 Removing the M10x150 bolt from the U notch

Step 3 Install the bracket assembly on U-steel. Then, place the removed end of the bolt into the U notch,

as shown in Figure 7-26.

Figure 7-26 Bracket assembly installed on U-steel

Step 4 To secure the bracket assembly to the U-steel, use a torque wrench with an aperture of 16 mm

(0.67 in.) to tighten the two M10 nuts with a torque of 40 N·m (354.03 lbf·in.), as shown in

Figure 7-27.

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Figure 7-27 Securing the bracket assembly

(1) Plastic screw cap

Step 5 Install the RRU on the main mounting bracket until the RRU snaps shut, as shown in Figure

7-28.

Figure 7-28 Installing the RRU on the main mounting bracket

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----End

7.4 Installing the RRU on Angle Steel

This section describes the procedure for installing the RRU on angle steel and the precautions

that must be taken during the installation. The RRU installed on angle steel can be mounted to

a tower or placed on the ground. It is recommended that only one RRU be installed on angle

steel.

Prerequisites

Before you install an RRU on a tower, the RRU and mounting kits are hoisted onto the tower.

For details, see 6.1 Hoisting an RRU onto a Tower.

The hoist clamp on the main mounting bracket is secured properly.

Context

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

Figure 7-29 Top view of the RRU

(1) Angle steel

Procedure

Step 1 Determine a position for installing the main mounting bracket.

lIf the RRU is to be installed on a tower, determine the position for installing the main

mounting bracket by referring to 3.5.1 Clearance for a Single RRU.

lIf the RRU is to be installed on the ground, determine the position for installing the main

mounting bracket by referring to Figure 7-30.

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Figure 7-30 Distance between the main mounting bracket and the ground

NOTE

It is recommended that the main mounting bracket be 1200 mm to 1600 mm (47.24 in. to 62.99 in.)

above the ground.

Step 2 Manually loosen the two M10 nuts on the mounting kits counterclockwise, horizontally remove

one end of the M10x150 bolt from the U notch on the auxiliary mounting bracket, and then

disassemble the mounting kits, as shown in Figure 7-31.

Figure 7-31 Removing the M10x150 bolt from the U notch

Step 3 Install the bracket assembly on angle steel. Then, place the removed end of the bolt into the U

notch, as shown in Figure 7-32.

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Figure 7-32 Bracket assembly installed on angle steel

Step 4 To secure the bracket assembly to the angle steel, use a torque wrench with an aperture of 16

mm (0.67 in.) to tighten the two M10 nuts with a torque of 40 N·m (354.03 lbf·in.), as shown in

Figure 7-33.

Figure 7-33 Securing the bracket assembly

(1) Plastic screw cap

Step 5 Install the RRU on the main mounting bracket until the RRU snaps shut, as shown in Figure

7-34.

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Figure 7-34 Installing the RRU on the main mounting bracket

----End

7.5 Installing the RRU on a Wall

This section describes the procedure for installing the RRU on a wall and the precautions that

must be taken during the installation.

Prerequisites

The hoist clamp on the main mounting bracket is secured properly.

Context

The wall on which RRUs are installed must meet the following requirements:

lWhen a single RRU is installed, the wall has a capacity of bearing at least four times the

weight of the RRU.

lExpansion bolts must be tightened with a torque of 15 N·m (265.52 lbf·in.) to ensure the

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

Procedure

Step 1 Remove the plastic screw caps, M10 nuts, spring washers, flat washers, auxiliary brackets, and

M10x150 bolts in sequence. Then, use the main mounting bracket to secure the RRU to a wall.

Step 2 Place the main mounting bracket against the installation position, use a level to verify that the

main mounting bracket is placed horizontally, and then mark anchor points with a marker, as

shown in Figure 7-35.

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Figure 7-35 Marking the anchor points

(1) Main mounting bracket (2) RRU

NOTE

It is recommended that the main mounting bracket be 1200 mm to 1600 mm (47.24 in. to 62.99 in.) above the

ground.

Figure 7-36 Expansion bolt assembly

(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 bolt assemblies, as shown in Figure

7-37.

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

1. Use a hammer drill with a φ12 bit to drill holes vertically at the marked anchor points.

Ensure that the depth of each hole ranges from 55 mm to 60 mm (2.17 in. to 2.36 in.).

WARNING

Take proper safety measures to protect your eyes and respiratory tract against the dust

before drilling holes.

2. Vertically insert the M8x85 expansion bolts into the mounting holes and use a rubber mallet

to knock them until they are buried in the holes.

3. Partially tighten the expansion bolts clockwise.

4. Loosen the expansion bolts counterclockwise and then remove the M8x85 expansion bolts,

spring washers, plastic tubes, and flat washers in sequence.

NOTE

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

Step 4 Use the two removed M8x85 expansion bolts to secure the main mounting brackets to the wall.

Then, use a torque socket to tighten the nuts of the expansion bolts with a torque of 15 N·m

(265.52 lbf·in.), as shown in Figure 7-38.

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Figure 7-38 Securing the main mounting bracket to a wall

(1) M8x85 expansion bolts (2) Spring washers (3) Flat washers

Step 5 Install the RRU on the main mounting bracket until the RRU snaps shut, as shown in Figure

7-39.

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Figure 7-39 Installing the RRU

----End

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8 Installing RRU Cables

About This Chapter

This chapter describes the procedure for installing RRU cables.

8.1 Cabling Requirements

Cables must be routed according to the specified cabling requirements to prevent signal

interference.

8.2 Cable Connections

This section describes the cable connections for a single RRU and multiple RRUs.

8.3 Installation Process

This section describes the process of installing RRU cables.

8.4 RRU Cable List

This section describes RRU cable connections.

8.5 Installing an RRU PGND Cable

This section describes the procedure for installing an RRU PGND cable.

8.6 Installing an RRU RF Jumper

This section describes the procedure for installing an RRU RF jumper.

8.7 Installing an RRU Alarm Cable

This section describes the procedure for installing an RRU alarm cable.

8.8 Installing an RRU AISG Multi-Wire Cable and an RRU AISG Extension Cable

This section describes the procedures for installing an RRU AISG multi-wire cable and an RRU

AISG extension cable.

8.9 Opening the Cover Plate of an RRU Cabling Cavity

This section describes the procedure for opening the cover plate of an RRU cabling cavity.

8.10 Installing an RRU Power Cable

This section describes the procedure for installing an RRU power cable.

8.11 Installing an Optical Fiber Cable

This section describes the procedure for installing an optical fiber cable.

8.12 Closing the Cover Plate of an RRU Cabling Cavity

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Issue Draft A (2012-11-30) Huawei Proprietary and Confidential

This section describes the procedure for closing the cover plate of an RRU cabling cavity.

DBS3900

RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

Issue Draft A (2012-11-30) Huawei Proprietary and Confidential

8.1 Cabling Requirements

Cables must be routed according to the specified cabling requirements to prevent signal

interference.

NOTE

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

General Cabling Requirements

Requirements for Bending Radius

lThe bending radius of the 7/8'' feeder must be more than 250 mm (9.84 in.), and the bending

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

lThe bending radius of the 1/4'' jumper, ordinary 1/2'' jumper, super-flexible 1/2'' jumper,

and RG-8U jumper must be more than 35 mm (1.38 in.), 127 mm (5 in.), 50 mm (1.97 in.),

and 50 mm (1.97 in.), respectively.

lThe bending radius of the power cable or PGND cable must be at least three times the

diameter of the cable.

lThe bending radius of a fiber optic cable is at least 20 times the diameter of the fiber optic

cable, and the minimum bending radius of the breakout cable at each end of the fiber optic

cable is 30 mm (1.18 in.).

lThe bending radius of the E1/T1 cable must be at least three times the diameter of the cable.

lThe bending radius of the signal cable must be at least five times the diameter of the cable.

Requirements for Cable Binding

lThe same types of cable must be bound together.

lDifferent types of cable must be separately routed with the minimum spacing of 30 mm

(1.18 in.) and cannot be entangled.

lThe cables must be bound tightly and neatly. The sheaths of the cables must not be damaged.

lCable ties are installed in the same direction, and those at the same horizontal line must be

in a straight line.

lThe excess of indoor cable ties is trimmed off, and the excess of outdoor cable ties allows

about 5 mm (0.2 in.), without remaining rough edges.

lLabels or nameplates must be attached to both ends, joints, or turns of cables after they are

installed.

Security Requirements

lCables should be placed away from sharp objects or wall burrs. If these positions are

inevitable, protect the cables with protection pipes.

lCables must be routed away from heat sources, or heat-insulation materials are added

between cables and heat sources.

lSufficient slack (recommended for about 0.1 m [0.33 ft.]) is provided in cables at turns or

the position close to a device, facilitating cable and device maintenance.

Indoor Cabling Requirements

lCables are routed indoors through the feeder window.

DBS3900

RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

Issue Draft A (2012-11-30) Huawei Proprietary and Confidential

lDrip loops must be made outside the feeder window, and the requirements for the minimum

bending radius are met.

lWhen cables are routed indoors, engineers are required indoors for cooperation.

lThe feeder window must be waterproofed.

Outdoor Cabling Requirements

lCables routed outdoors must be led through a pipe when they may be damaged.

lAC power cables, transmission cables, and cables buried in the ground must be protected.

lIf cables at the cabinet bottom need to be routed through a pipe along the ground, lead the

pipe into the cabinet base for about 3 m (9.84 ft.) to 5 m (16.4 ft.), not into the cabinet.

Block the pipe with waterproof tape or silicon gel, and secure the pipe to the cable hole at

the cabinet bottom with metal piece.

lIf 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 routed

through the cable hole at the cabinet bottom.

lCables are secured with cable clips.

lCables are routed neatly along the specified cabling direction and secured with cable clips.

lThe positions for cable clips are determined onsite. For example, the cable clips for the

7/8" feeder are installed at the spacing of 1.5 m (4.92 ft.) to 2 m (6.56 ft.) in the same

direction, and the cable clips for the power cables are installed at the spacing of 1 m (3.28

ft.) to 1.5 m (4.92 ft.) in the same direction.

lCable clips must be vertical with cables, and the cables in a cable clip must be parallel.

lAfter routing cables neatly and correctly, tighten the screws on cable clips.

Secure cables on the cable tray, as shown in Figure 8-1.

DBS3900

RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

Issue Draft A (2012-11-30) Huawei Proprietary and Confidential

Figure 8-1 Securing cables on the cable tray

Secure cables on the tower, as shown in Figure 8-2.

DBS3900

RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

Issue Draft A (2012-11-30) Huawei Proprietary and Confidential

Figure 8-2 Securing cables on the tower

Special Cabling Requirements

Cabling Requirements for Power Cables

lPower cables must be installed in the position specified in engineering design documents.

lIf the length of power cables is insufficient, replace the cables rather than adding connectors

or soldering joints to lengthen the cables.

lCables must be routed by only qualified and trained personnel before all preparations are

made.

DBS3900

RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

Issue Draft A (2012-11-30) Huawei Proprietary and Confidential

lCables are routed in an untangled and orderly fashion.

lIf DC power cables need to be routed on the tower platform, lay out the cables on the

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

lIf DC power cables need to be routed close to a device on the tower, secure the cables to

the guardrail or pole with cable clips. The device cannot be far away from the position for

securing the cables.

Cabling Requirements for PGND Cables

lPGND cables for the base station must be connected to the same ground bar.

lPGND cables must be buried in the ground or routed indoors. They should not be routed

overhead before they are led into the equipment room.

lThe exterior of the coaxial wire and the shield layer of the shielded cable must have proper

electrical contact with the metal surface of the equipment to which they are connected.

lPGND cables and signal cables must be installed in an untangled and orderly fashion. A

certain distance must be reserved between them to prevent interference from each other.

lFuses or switches must not be installed on the PGND cables.

lOther devices must not be used for electrical connections of the PGND cables.

lAll the metal parts in the housing of the equipment must be reliably connected to the ground

terminal.

Cabling Requirements for E1 Cables

lE1 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.).

lE1 cables are routed straightly and bound neatly with cable ties.

lSufficient slack is provided in E1 cables at turns.

Cabling Requirements for Fiber Optic Cables

lFiber optic cables must be routed by at least three qualified and trained personnel before

all preparations are made.

lFiber optic cables are used within the temperature range of -40°C to 60°C. If the current

temperature is out of the range, make protection measures or route the cables again.

lCables are routed in an untangled and orderly fashion.

lDo not bind fiber optic cables at turns.

lDo not stretch, step on, or place heavy objects on fiber optic cables. Keep the cables away

from sharp objects.

lWhen fiber optic cables are routed, the excess of the cables must be coiled around special

devices, such as a fiber coiler.

lWhen coiling fiber optic cables, apply even strength. Do not bend the cables with force.

lVacant optical connectors must be covered with dustproof caps.

lFiber optic cables cannot be squeezed by the cabinet door when routed through the cabinet.

lIf fiber optic cables need to be routed on the tower platform, lay out the cables on the

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

lIf fiber optic cables need to be routed close to a device on the tower, secure the cables to

the guardrail or pole with cable clips. The device cannot be far away from the position for

securing the cables.

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RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

Issue Draft A (2012-11-30) Huawei Proprietary and Confidential

lIf the fiber optic cables close to a device are too long, coil the excess of the cables and

secure them on the tower.

8.2 Cable Connections

This section describes the cable connections for a single RRU and multiple RRUs.

NOTE

A lower-level RRU obtains power directly from the external power system, but not from an upper-level

RRU using a power cable.

For the cable connection between an RRU and an RGPS antenna (optional), refer to the document delivered

with the RGPS antenna. For the cable connection between an RRU and an AUF (optional), refer to the

document delivered with the AUF.

Figure 8-3 shows the cable connections adopted for a single RRU when the alarm monitoring

function is provided.

Figure 8-3 Cable connections for a single RRU (1)

(1) PGND cable (2) RRU RF jumper (3) RRU alarm cable

(4) CPRI optical fiber cable (5) RRU power cable (6) RGPS signal cable

Figure 8-4 shows the cable connections adopted for a single RRU when the remote electrical

tilt (RET) function is provided.

DBS3900

RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

Issue Draft A (2012-11-30) Huawei Proprietary and Confidential

Figure 8-4 Cable connections for a single RRU (2)

(1) PGND cable (2) RRU RF jumper (3) RRU AISG multi-wire cable

(4) RRU AISG extension cable (5) CPRI optical fiber cable (6) RRU power cable

(7) RGPS signal cable

Figure 8-5 shows the cable connections adopted for multiple RRUs when the alarm monitoring

function is provided.

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RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

Issue Draft A (2012-11-30) Huawei Proprietary and Confidential

Figure 8-5 Cable connections for multiple RRUs (1)

(1) PGND cable (2) RRU RF jumper (3) RRU alarm cable

(4) CPRI optical fiber cable or SFP high-speed cable for

cascading RRUs

(5) RRU power cable (6) RGPS signal cable

NOTE

If you must cascade two or more RRUs in the same cell, for example, to expand the capacity, install the

alarm cable to the RRU at the last level.

Figure 8-6 shows the cable connections adopted for multiple RRUs when the remote electrical

tilt (RET) function is provided.

DBS3900

RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

Issue Draft A (2012-11-30) Huawei Proprietary and Confidential

Figure 8-6 Cable connections for multiple RRUs (2)

(1) PGND cable (2) RRU RF jumper (3) RRU AISG multi-wire cable

(4) RRU AISG extension cable (5) CPRI optical fiber cable or SFP high-

speed cable for cascading RRUs

(6) RRU power cable

(7) RGPS signal cable

8.3 Installation Process

This section describes the process of installing RRU cables.

Figure 8-7 shows the process of installing RRU cables.

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RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

Issue Draft A (2012-11-30) Huawei Proprietary and Confidential

Figure 8-7 Process of installing RRU cables

8.4 RRU Cable List

This section describes RRU cable connections.

Table 8-1 lists RRU cables.

Table 8-1 RRU cables

Cable One End The Other End

Connector Connected

to...

Connector Connected to...

RRU PGND

Cable

OT terminal

(M6)

Ground

terminal on the

RRU

OT terminal

(M8)

Ground terminal

on the ground bar

RRU Power

Cable

Tool-less

female

connector

(pressfit type)

NEG(-) and

RTN(+) ports

on the RRU

Tool-less female

connector

(pressfit type)

One of RRU0 to

RRU5 ports on

the EPS

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RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

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Cable One End The Other End

Connector Connected

to...

Connector Connected to...

OT terminal

(M4)

One of LOAD0

to LOAD5 ports

on the DCDU

One of LOAD4

to LOAD9 ports

on the PDU

CPRI Fiber

Optic Cable

DLC connector CPRI0/IR0 port

on the RRU

DLC connector CPRI port on the

LBBP in the

BBU

CPRI1/IR1 port

on the RRU

CPRI0/IR0 port

on the RRU

RRU RF

Jumper

Type N

connector

ANT0 to ANT3

ports on the

RRU

Type N

connector

Antenna system

RGPS Jumper

(optional)

Waterproofed

DB15

connector

Remote Global

Positioning

System (RGPS)

port at the RRU

bottom

Round 12-pin

connector

RGPS antenna

SFP High-

Speed Cable for

Cascaded RRUs

(optional)

SFP20 male

connector

CPRI1 port on

the RRU

SFP20 male

connector

CPRI0 port on

the RRU

RRU Alarm

Cable (optional)

Waterproofed

DB9 male

connector

RET/

EXT_ALM

port on the

RRU

Cord end

terminal

External alarm

device

RRU AISG

Multi-Wire

Cable (optional)

Waterproofed

DB9 male

connector

RET/

EXT_ALM

port on the

RRU

Standard AISG

female connector

Standard AISG

male connector

on the remote

control unit

(RCU) or on the

AISG extension

cable

RRU AISG

Extension

Cable (optional)

Standard AISG

male connector

Standard AISG

female

connector on

the AISG multi-

wire cable

Standard AISG

female connector

Standard AISG

male connector

on the RCU

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RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

Issue Draft A (2012-11-30) Huawei Proprietary and Confidential

8.5 Installing an RRU PGND Cable

This section describes the procedure for installing an RRU PGND cable.

Context

The minimum cross-sectional area of an RRU PGND cable is 16 mm2 (0.025 in.2). The cable

has an M6 OT terminal at one end and an M8 terminal at the other end.

Procedure

Step 1 Prepare an RRU PGND cable.

1. Cut the cable to the required length based on the actual cable route.

2. Add an OT terminal to each end of the cable by referring to Assembling the OT Terminal

and 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 RRU

bottom and the M8 OT terminal at the other end to the external ground bar, as shown in Figure

8-8.

Figure 8-8 Installing an RRU PGND cable

NOTE

Crimp OT terminals in correct directions, as shown in Figure 8-9.

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RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

Issue Draft A (2012-11-30) Huawei Proprietary and Confidential

Figure 8-9 Correct direction of an OT terminal

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

----End

8.6 Installing an RRU RF Jumper

This section describes the procedure for installing an RRU RF jumper.

Context

The RF ports on the RRU must be connected using RF jumpers to the mapping ANT0 to ANT3

ports on the antenna. Figure 8-10shows the mapping relationship between the RF ports and the

antenna ports.

Figure 8-10 The mapping relationship between the RF ports and the antenna ports

NOTE

The port labels in this figure are examples and for reference only.

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RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

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Procedure

Step 1 Connect the Type N connector at one end of the RRU RF jumper to the ANT port and use a

torque wrench to tighten the connector with a torque of 1 N·m (12.39 lbf·in.), as shown in Figure

8-11.

Figure 8-11 Installing an RRU RF jumper

CAUTION

On AC-powered electric railways, such as high speed railways, when leaky cables are connected

to RRUs installed in tunnels, high-voltage-resistant DC blocks must be installed between RRU

RF jumpers and the leaky cables to protect the RRUs against damage.

Step 2 Connect the other end of the RF jumper to the external antenna system.

Step 3 Waterproof the connectors of the RF jumper by referring to Figure 8-12.

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RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

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Figure 8-12 Waterproofing a connector of the RF jumper

(1) PVC insulation tape (2) Waterproof tape

NOTE

lBefore wrapping the waterproof tape, stretch the tape evenly until the length of the tape is twice its original

length.

lBefore wrapping the PVC insulation tape, do not stretch the PVC insulation tape.

lEnsure that each layer of tape overlaps more than 50% of the preceding layer. Stretch and press the tape

tightly to avoid wrinkles or spaces. Ensure that the tape is tightly wrapped and stuck and will not fall off.

lEnsure that the adhesive surface of the tape overlaps the lower layer.

lCable ties, cutting at the position of 3mm ~5mm far from head.

1. Wrap each connector with one layer of 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. Do not cut the tape until all the three layers of the

tape are already wrapped. 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. Do not cut the tape until all the three layers of

the tape are already wrapped. Wrap each layer of tape around the connector tightly.

Step 4 Retain the dustproof caps on vacant antenna connectors and waterproof the dustproof caps, as

shown in Figure 8-13.

CAUTION

Do not remove dustproof caps from vacant antenna connectors.

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Figure 8-13 Waterproofing a dustproof cap

(1) Dustproof cap (2) PVC insulation tape (3) Waterproof tape

NOTE

lBefore wrapping the waterproof tape, stretch the tape evenly until the length of the tape is twice its original

length.

lBefore wrapping the PVC insulation tape, do not stretch the PVC insulation tape.

lEnsure that each layer of tape overlaps more than 50% of the preceding layer. Stretch and press the tape

tightly to avoid wrinkles or spaces. Ensure that the tape is tightly wrapped and stuck and will not fall off.

lEnsure that the adhesive surface of the tape overlaps the lower layer.

lCable ties, cutting at the position of 3mm~5mm far from head.

1. Verify that dustproof caps are not removed.

2. Wrap each dustproof cap with one layer of PVC insulation tape from bottom up.

3. Wrap each dustproof cap with three layers of waterproof tape, first from bottom up, then

from top down, and finally from bottom up. Do not cut the tape until all the three layers of

the tape are already wrapped. Wrap each layer of tape around the cap tightly.

4. Wrap each dustproof cap with three layers of PVC insulation tape, first from bottom up,

then from top down, and finally from bottom up. Do not cut the tape until all the three layers

of the tape are already wrapped. Wrap each layer of tape around the connector tightly.

Step 5 Route the cable by referring to Cabling Requirements. Then, use cable ties to bind the cable.

Step 6 Label the installed cable by referring to Attaching a Sign Plate Label.

Step 7 Attach colored insulation tapes to the jumper by referring to Attaching the Color Ring.

----End

8.7 Installing an RRU Alarm Cable

This section describes the procedure for installing an RRU alarm cable.

Procedure

Step 1 Connect the DB9 connector at one end of the RRU alarm cable to the RET/EXT_ALM port on

the RRU, and connect the eight cord end terminals at the other end to the external alarm device,

as shown in Figure 8-14.

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RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables

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Figure 8-14 Installing an RRU alarm cable

Step 2 Route the cable by referring to Cabling Requirements. Then, use cable ties to bind the cable.

Step 3 Label the installed cable by referring to Attaching an L-Shaped Label.

----End

8.8 Installing an RRU AISG Multi-Wire Cable and an RRU

AISG Extension Cable

This section describes the procedures for installing an RRU AISG multi-wire cable and an RRU

AISG extension cable.

Context

When the distance between an RRU and a Remote Control Unit (RCU) is longer than 5 m (16.4

ft.), an AISG multi-wire cable is not long enough to connect the RRU and the RCU. In this case,

an AISG extension cable is used to extend the AISG multi-wire cable.

Procedure

lInstall an AISG multi-wire cable that is not configured with an AISG extension cable.

1. Connect the waterproofed DB9 connector at one end of the AISG multi-wire cable to

the RET/EXT_ALM port on the bottom of the RRU, as shown in Figure 8-15.

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Figure 8-15 Installing an RRU AISG multi-wire 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 Cabling Requirements. Then, use cable ties to bind the

cable.

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

lInstall an AISG multi-wire cable that is configured with an AISG extension cable.

1. Connect the waterproofed DB9 connector at one end of the AISG multi-wire cable to

the RET/EXT_ALM port on the bottom of the RRU, and the other end of the cable to

the standard AISG male connector of the AISG extension cable, as shown in Figure

8-16.

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Figure 8-16 Installing an RRU AISG multi-wire cable

2. Connect the other end of the AISG extension cable to the standard AISG male

connector on the RCU, as shown in Figure 8-17.

Figure 8-17 Installing an RRU AISG multi-wire cable

3. Route the cable by referring to Cabling Requirements. Then, use cable ties to bind the

cable.

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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 an RRU Cabling Cavity

This section describes the procedure for opening the cover plate of an RRU cabling cavity.

Procedure

Step 1 Wear ESD gloves.

CAUTION

Take proper ESD protection measures, for example, wear ESD gloves, to prevent electrostatic

damage to the boards, modules, or electronic components.

Step 2 Use an M4 Phillips screwdriver to loosen the protection screw on the cover plate of the RRU

cabling cavity, and pull the handle outwards to open the cover plate, as shown in Figure 8-18.

Figure 8-18 Opening the cover plate of the RRU cabling cavity

(1) Protection screw

Figure 8-19 shows the RRU cabling cavity.

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Figure 8-19 RRU cabling cavity

(1) Cover plate (2) Cable diagram on label (3) Cable trough for the optical fiber cable

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

(7) Cabling cavity - -

Step 3 Loosen the screws on the clips, and open the clips, as shown Figure 8-20.

NOTE

Open the clips only for the cables to be installed.

Figure 8-20 Opening clips

----End

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8.10 Installing an RRU Power Cable

This section describes the procedure for installing an 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 an Easy Power Receptacle (Pressfit Type) Connector to an RRU

Power Cable.

Context

CAUTION

When installing the RRU power cable, connect the RRU power cable first to the RRU and then

to the power device. Operations in the reverse sequence may cause damage to the components

and injury of human bodies.

Procedure

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

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 8-21.

Figure 8-21 Installing an RRU power cable

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CAUTION

Ensure that the exposed shield layer of the power cable is properly tightened using

the clip.

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

3. Route the cable by referring to Cabling Requirements. Then, use cable ties to bind the

cable.

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

lInstall an RRU power cable that feeds power to an RRU from the embedded power system

(EPS) when the EPS 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 8-21.

2. Connect the tool-less female connector (pressfit type) at one end of the RRU power

cable to the RRU0 port on the EPS subrack.

NOTE

lThe blue core wire in the tool-less female connector (pressfit type) is connected to the left

port on the EPS subrack, and the black/brown core wire is connected to the right port on

the EPS subrack.

lThe EPS can supply power to a maximum of six RRUs. The RRU power cable can be

connected to any of RRU0 to RRU5 ports on the EPS subrack.

3. Route the cable by referring to Cabling Requirements. Then, use cable ties to bind the

cable.

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

----End

8.11 Installing an Optical Fiber Cable

This section describes the procedure for installing an optical fiber cable.

Prerequisites

Before the installation, distinguish single-mode optical modules from multi-mode optical

modules by either of the following means:

lSM and MM labels on an optical module: SM indicates a single-mode optical module, and

MM indicates a multi-mode optical module.

lColor of the puller on an optical module: Blue indicates a single-mode optical module, and

black or gray indicates a multi-mode optical module.

CAUTION

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

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Context

A CPRI optical fiber cable transmits CPRI signals between a BBU and an RRU.

Procedure

Step 1 Lower the pullers of two optical modules, insert one optical module into the CPRI0 port on the

RRU and the other optical module into the CPRI port on the BBU, and raise the pullers, as

shown in Figure 8-22.

Figure 8-22 Installing an optical module

CAUTION

The performance of an optical module that is exposed to the air for more than 20 minutes may

be abnormal. Therefore, you must insert an fiber optic cable into an unpacked optical module

within 20 minutes.

Step 2 Connect the end labeled 1A and 1B of the optical fiber cable to the optical module on the RRU

side, as shown in Figure 8-23.

Figure 8-23 Installing an CPRI optical fiber cable

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CAUTION

To avoid any damage to optical fiber cables, secure the optical fiber cable in the cable clip near

the power cable to leave some slack at the bend. Tighten the screws on the cable clip with a

torque of 1.4 N·m (12.39 lbf·in.).

Step 3 Connect the end labeled 2A and 2B of the optical fiber cable to the optical module on the BBU

side.

Step 4 Route the cable by referring to Cabling Requirements. Then, use cable ties to bind the cable.

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

----End

8.12 Closing the Cover Plate of an RRU Cabling Cavity

This section describes the procedure for closing the cover plate of an RRU cabling cavity.

Procedure

Step 1 Close clips and use a torque screwdriver to tighten the screws on each clip with a torque of 1.4

N·m (12.39 lbf·in.), as shown in Figure 8-24.

Figure 8-24 Closing clips

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CAUTION

Ensure that the exposed shield layer of the power cable is properly tightened using the clip.

Step 2 Insert waterproof blocks into vacant cable troughs in the cabling cavity, as shown in Figure

8-25.

Figure 8-25 Correct placement of waterproof blocks

Step 3 Close the cover plate of the RRU cabling cavity, and use a torque screwdriver to tighten the

screws on the cover plate with a torque of 1.4 N·m (12.39 lbf·in.), as shown in Figure 8-26.

Figure 8-26 Closing the cover plate of the RRU cabling cavity

(1) Protection screw

CAUTION

Before tightening the screws on the cover plate, ensure that cables and waterproof blocks are

properly inserted into troughs.

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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 section describes how to check RRU hardware installation after the installation is complete.

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

Table 9-1 Checklist for the RRU hardware installation

SN Item

1The position for each device conforms to the engineering drawing and meets the

space requirement. Sufficient space is reserved for equipment maintenance.

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 cabling

cavity, 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 waterproofed.

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

6 The terminals at two ends of each power cable or PGND cable are securely soldered

or crimped.

7 None of power cables and PGND cables can be short-circuited or reversely

connected. In addition, these cables are not damaged or broken.

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 the

building share one group of ground conductors.

10 The connectors of each signal cable are intact and securely linked, and these cables

are not damaged or broken.

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

jumper.

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10 Powering On an RRU

This section describes how to check the power-on status of an RRU after all the devices are

installed.

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

Figure 10-1 Powering on an RRU

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NOTE

lThe RRU is provided with -48 V DC power and the external voltage ranges from -32 V DC to -60 V

DC.

lWhen the RRU is working properly, the RUN indicator blinks one second on and one second off, and

the ALM indicator is steady off.

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11 Appendix

About This Chapter

This section describes the procedure for adding an easy power receptacle (pressfit type)

connector.

11.1 Adding an Easy Power Receptacle (Pressfit Type) Connector to an RRU Power Cable

This section describes the procedure for adding an easy power receptacle (pressfit type)

connector to an RRU power cable.

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11.1 Adding an Easy Power Receptacle (Pressfit Type)

Connector to an RRU Power Cable

This section describes the procedure for adding an easy power receptacle (pressfit type)

connector to an RRU power cable.

Procedure

Step 1 Open the cabling cavity and take out the easy power receptacle (pressfit type) connector. Then,

mark the lengths of the power cable for different operations based on the label on the cover of

the cabling cavity, as shown in Figure 11-1.

Figure 11-1 Marking the lengths of the RRU 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 power

cable, as shown in Figure 11-2.

Figure 11-2 Stripping off the specified length of sheath from the power cable

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

Figure 11-3 Stripping off the sheath from 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 in

the easy power receptacle (pressfit type) connector, as shown in Figure 11-4.

Figure 11-4 Stripping off the sheath from each core wire

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 Loosening screws

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Step 6 Connect the blue core wire labeled NEG(-) to the - port and connect the black core wire labeled

RTN(+) to the + port on the easy power receptacle (pressfit type) connector. Then, tighten the

screws, as shown in Figure 11-7.

Figure 11-7 Adding an easy power receptacle (pressfit type) connector to a power cable

Ensure that only a 1.5 mm (0.06 in.) core wire is exposed out of the connector and that the

exposed part cannot be folded, as shown in Figure 11-8.

Figure 11-8 Easy power receptacle (pressfit type) connectors installed in different ways

CAUTION

If the wire connections are incorrect, the equipment cannot be powered on. Correctly connect

the 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 Correct installation of an easy power receptacle (pressfit type) connector

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101

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