Huawei Technologies RRU3276 Remote Radio Unit User Manual RRU3252 RRU3256 Installation Guide

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

UserManual.wiki >

Huawei Technologies >

RRU3276 User Manual >

Installation Guide 2 HTML Version

Installation Guide 2

DBS3900 LTE TDD

V600R007C00

RRU3276 Installation Guide

Issue

Draft A

Date

2015-10-30

HUAWEI TECHNOLOGIES CO., LTD.

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

DBS3900 LTE TDD RRU3252/RRU3256 Installation

Guide

About This Document

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

About This Document

Purpose

This document describes the process of installing a DC RRU3276 (referred to as RRU in this

document).

Product Version

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

Product Name

Product Version

eRelay DBS3900

V100R003C00 and later versions

Intended Audience

This document is intended for:

Base station installation engineers

Organization

1 Change History

This chapter describes changes in the RRU3276 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.

DBS3900 LTE TDD RRU3252/RRU3256 Installation

Guide

About This Document

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

iii

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 that, if not avoided,

will result in death or serious injury.

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

not avoided, could result in minor or moderate injury.

Indicates a potentially hazardous situation that, if not avoided,

could cause equipment damage, data loss, and performance

degradation, or unexpected results.

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

Provides additional information to emphasize or supplement

important points of the main text.

DBS3900 LTE TDD RRU3252/RRU3256 Installation

Guide

About This Document

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

General Conventions

Convention

Description

Times New Roman

Normal paragraphs are in Times New Roman.

Boldface

Names of files, directories, folders, and users are in

boldface. For example, log in as user root.

Italic

Book titles are in italics.

Courier New

Terminal display is in Courier New.

Command Conventions

Convention

Description

Boldface

The keywords of a command line are in boldface.

Italic

Command arguments are in italics.

[ ]

Items (keywords or arguments) in square brackets [ ] are

optional.

{ x | y | ... }

Alternative items are grouped in braces and separated by

vertical bars. One is selected.

[ x | y | ... ]

Optional alternative items are grouped in square brackets

and separated by vertical bars. One or none is selected.

{ x | y | ... } *

Alternative items are grouped in braces and separated by

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

be selected.

GUI Conventions

Convention

Description

Boldface

Buttons, menus, parameters, tabs, windows, 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.

Keyboard Operation

Format

Description

Key

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

DBS3900 LTE TDD RRU3252/RRU3256 Installation

Guide

About This Document

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Format

Description

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 Operation

Action

Description

Click

Select and release the primary mouse button without

moving the pointer.

Double-click

Press the primary mouse button twice continuously and

quickly without moving the pointer.

Drag

Press and hold the primary mouse button and move the

pointer to a certain position.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

Contents

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Contents

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

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

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

2.1 Reference Documents ...................................................................................................................................... 2

2.2 Tools and Instruments ...................................................................................................................................... 2

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

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

3.1 RRU Exterior ................................................................................................................................................... 5

3.2 RRU Ports ........................................................................................................................................................ 6

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 Installing an RRU on a Tower ........................................................................................................................ 26

6.2 Hoisting Fiber Optic Cables onto a Tower ..................................................................................................... 30

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

Contents

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

vii

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

8.1 Cabling Requirements .................................................................................................................................... 66

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

8.3 Installation Process ......................................................................................................................................... 76

8.4 RRU Cable List .............................................................................................................................................. 77

8.5 Installing an RRU PGND Cable ..................................................................................................................... 79

8.6 Installing an RRU RF Jumper ........................................................................................................................ 80

8.7 Installing an RRU Alarm Cable ...................................................................................................................... 83

8.8 Installing an RRU AISG Multi-Wire Cable and an RRU AISG Extension Cable .......................................... 84

8.9 Opening the Cover Plate of an RRU Cabling Cavity ..................................................................................... 87

8.10 Installing an RRU Power Cable ................................................................................................................... 89

8.11 Installing an Optical Fiber Cable .................................................................................................................. 90

8.12 Closing the Cover Plate of an RRU Cabling Cavity .................................................................................... 92

9 Checking the RRU Hardware Installation ............................................................................. 95

10 Powering On an RRU ............................................................................................................... 96

11 Appendix .................................................................................................................................... 98

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

1 Change History

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

1 Change History

This chapter describes changes in the RRU3276 Installation Guide.

Draft A (2015-10-30)

This is a draft.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

2 Installation Preparations

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

2.1 Reference Documents

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

The following reference documents are required during RRU installation:

 RRU3276 Hardware Description

 DBS3900 Installation Guide

 OCB-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:

 DBS3900 (ICR) Installation Guide

2.2 Tools and Instruments

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

2 Installation Preparations

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

2 Installation Preparations

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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:

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

proper installation and operation methods.

 The number of onsite personnel depends on the engineering schedule and installation

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

3.1 RRU Exterior

This section describes the exterior and dimensions of an RRU.

Figure 3-1 shows an RRU.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 3-1 RRU exterior

Figure 3-2 shows RRU dimensions.

Figure 3-2 RRU dimensions

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 3-3 Ports on the RRU panels

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

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Item

Label

Description

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

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.

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Label

Color

Status

Description

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/I

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/I

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Label

Color

Status

Description

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

 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.).

 If 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.

 If 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.).

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

 The 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 3-5.

Figure 3-5 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 3-6 shows an RRU installed on a pole.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 3-6 RRU installed on a pole

Installing an RRU on U-steel

It is recommended that only one RRU be installed on 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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

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

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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:

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

weight of the RRU.

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

Minimum horizontal spacing between RRUs

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

3 Information About the Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Minimum vertical spacing between RRUs

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

Figure 3-23 Minimum vertical spacing between RRUs

eRelay DBS3900

RRU3252/RRU3256 Installation Guide

4 Unpacking the Equipment

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

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

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

 Wear clean gloves, and avoid touching the equipment, components, or parts with bare hands,

sweat-soaked gloves, or dirty gloves.

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

 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

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.

eRelay DBS3900

RRU3252/RRU3256 Installation Guide

4 Unpacking the Equipment

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

5 Installation Process

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

6 Hoisting the RRU and Cables onto a Tower

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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 Installing an RRU on a Tower

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

must be taken. 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.

6.1 Installing an RRU on a Tower

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

must be taken. 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.

Procedure

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

6 Hoisting the RRU and Cables onto a Tower

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

Figure 6-1 Hoisting an RRU onto a 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 mounting kits using the lifting sling, as shown in Figure

6-2, and binds the RRU using the lifting sling and traction sling, as shown in Figure 6-3.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

6 Hoisting the RRU and Cables onto a Tower

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 6-2 Binding mounting kits for the RRU

Figure 6-3 Binding the RRU

(1) Lifting sling

(2) Lifting eye

(3) Traction sling

(4) RRU handle

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

6 Hoisting the RRU and Cables onto a Tower

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

 Each sling has a load-bearing capacity of more than 200 kg (441 lb), the diameter of the

sling must be less than 25 mm (0.98 in.), and the angle at the top of the lifting sling [by the

knot] must not be greater than 60 degrees.

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

with the tower.

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

 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 Incorrect binding method - hoisting the RRU by the handle only

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

6 Hoisting the RRU and Cables onto a Tower

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 6-5 Incorrect binding method - hoisting the RRU by the lifting eye only

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 and mounting kits and install the RRU.

Step 3 Remove the lifting sling and traction sling.

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

----End

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

6 Hoisting the RRU and Cables onto a Tower

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 6-6 Hoisting fiber optic cables onto the tower

(1) Lifting sling

(2) Fixed pulley

(3) Traction sling

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.

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

6 Hoisting the RRU and Cables onto a Tower

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 6-7 Binding fiber optic cables

(1) Lifting sling

(2) Stretch sling

(3) Traction sling

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

as shown in Figure 6-8.

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

6 Hoisting the RRU and Cables onto a Tower

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

6 Hoisting the RRU and Cables onto a Tower

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

The connector on the power cable in the figure is only an example. The actual connector may vary

according to the situation.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

6 Hoisting the RRU and Cables onto a Tower

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

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.).

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

6 Hoisting the RRU and Cables onto a Tower

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

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

----End

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

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

RRU bottom is low.

 Place 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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 7-3 Single RRU installed on a pole

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 7-4 Two RRUs installed on a pole

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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 Installing an RRU on 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.

 If the RRU must be installed on a tower, see 3.5.1 Clearance for a Single RRU to

determine a position.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

 If 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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 7-10 Bracket assembly installed on a pole

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

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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 Figure 7-15.

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

face the same direction.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.)

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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 Installing an RRU on 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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 7-23 Top view of the RRU

(1) U-steel

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.

 If 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.

 If 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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

----End

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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 Installing an RRU on 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.

 If 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.

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

mounting bracket by referring to Figure 7-30.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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:

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

weight of the RRU.

 Expansion 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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 7-35 Marking the anchor points

(1) Main mounting bracket

(2) RRU

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

(5) Expansion

tube

Step 3 Drill holes at the anchor points, and then install expansion bolt assemblies, as shown in Figure

7-37.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.).

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.

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

7 Installing the RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 7-39 Installing the RRU

----End

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

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

8.1 Cabling Requirements

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

interference.

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

General Cabling Requirements

Requirements for Bending Radius

 The 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.).

 The 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.

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

diameter of the cable.

 The 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.).

 The bending radius of the E1/T1 cable must be at least three times the diameter of the

cable.

 The bending radius of the signal cable must be at least five times the diameter of the

cable.

Requirements for Cable Binding

 The same types of cable must be bound together.

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

(1.18 in.) and cannot be entangled.

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

damaged.

 Cable ties are installed in the same direction, and those at the same horizontal line must

be in a straight line.

 The 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.

 Labels or nameplates must be attached to both ends, joints, or turns of cables after they

are installed.

Security Requirements

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

inevitable, protect the cables with protection pipes.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

between cables and heat sources.

 Sufficient 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

 Cables are routed indoors through the feeder window.

 Drip loops must be made outside the feeder window, and the requirements for the

minimum bending radius are met.

 When cables are routed indoors, engineers are required indoors for cooperation.

 The feeder window must be waterproofed.

Outdoor Cabling Requirements

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

 AC power cables, transmission cables, and cables buried in the ground must be

protected.

 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 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.

 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

routed through the cable hole at the cabinet bottom.

 Cables are secured with cable clips.

 Cables are routed neatly along the specified cabling direction and secured with cable

clips.

 The 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.

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

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

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

eRelay 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.

eRelay 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

 Power cables must be installed in the position specified in engineering design

documents.

 If the length of power cables is insufficient, replace the cables rather than adding

connectors or soldering joints to lengthen the cables.

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

made.

 Cables are routed in an untangled and orderly fashion.

 If 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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

 If 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

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

 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.

 The 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.

 PGND 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.

 Fuses or switches must not be installed on the PGND cables.

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

 All the metal parts in the housing of the equipment must be reliably connected to the

ground terminal.

Cabling Requirements for E1 Cables

 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.).

 E1 cables are routed straightly and bound neatly with cable ties.

 Sufficient slack is provided in E1 cables at turns.

 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 Cables

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

all preparations are made.

 Fiber 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.

 Cables are routed in an untangled and orderly fashion.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

 Do not bind fiber optic cables at turns.

 Do not stretch, step on, or place heavy objects on fiber optic cables. Keep the cables

away from sharp objects.

 When fiber optic cables are routed, the excess of the cables must be coiled around

special devices, such as a fiber coiler.

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

 Vacant optical connectors must be covered with dustproof caps.

 Fiber optic cables cannot be squeezed by the cabinet door when routed through the

cabinet, as shown in Figure 8-4, Figure 8-5 and Figure 8-6.

Figure 8-4 CPRI fiber optic cables routed through the cabinet (1)

Figure 8-5 CPRI fiber optic cables routed through the cabinet (2)

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 8-6 FE/GE cables routed through the cabinet

 If 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.

 If 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.

 If 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.

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 8-7 shows the cable connections adopted for a single RRU when the alarm monitoring

function is provided.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 8-7 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 8-8 shows the cable connections adopted for a single RRU when the remote electrical

tilt (RET) function is provided.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 8-8 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 8-9 shows the cable connections adopted for multiple RRUs when the alarm

monitoring function is provided.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 8-9 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

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 8-10 shows the cable connections adopted for multiple RRUs when the remote

electrical tilt (RET) function is provided.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 8-10 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 8-11 shows the process of installing RRU cables.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 8-11 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

OT terminal

One of LOAD0

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Cable

One End

The Other End

Connector

Connected

to...

Connector

Connected to...

(M4)

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_AL

M port on the

RRU

Cord end

terminal

External alarm

device

RRU AISG

Multi-Wire

Cable

(optional)

Waterproofed

DB9 male

connector

RET/EXT_AL

M 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

eRelay DBS3900 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 8-12.

Figure 8-12 Installing an RRU PGND cable

Crimp OT terminals in correct directions, as shown in Figure 8-13.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 8-13 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 8-14shows the mapping relationship between the RF ports

and the antenna ports.

Figure 8-14 The mapping relationship between the RF ports and the antenna ports

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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 8-15.

Figure 8-15 Installing an RRU RF jumper

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 8-16.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 8-16 Waterproofing a connector of the RF jumper

(1) PVC insulation tape

(2) Waterproof tape

 Before wrapping the waterproof tape, stretch the tape evenly until the length of the tape is twice its

original length.

 Before wrapping the PVC insulation tape, do not stretch the PVC insulation tape.

 Ensure 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.

 Ensure that the adhesive surface of the tape overlaps the lower layer.

 Cable 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 8-17.

Do not remove dustproof caps from vacant antenna connectors.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 8-17 Waterproofing a dustproof cap

(1) Dustproof cap

(2) PVC insulation tape

(3) Waterproof tape

 Before wrapping the waterproof tape, stretch the tape evenly until the length of the tape is twice its

original length.

 Before wrapping the PVC insulation tape, do not stretch the PVC insulation tape.

 Ensure 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.

 Ensure that the adhesive surface of the tape overlaps the lower layer.

 Cable 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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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 8-18.

Figure 8-18 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

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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 8-19.

Figure 8-19 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.

 Install 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 8-20.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 8-20 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 8-21.

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

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

----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.

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 8-22.

Figure 8-22 Opening the cover plate of the RRU cabling cavity

(1) Protection screw

Figure 8-23 shows the RRU cabling cavity.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 8-23 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 8-24.

Open the clips only for the cables to be installed.

Figure 8-24 Opening clips

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

----End

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

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

 Install 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 8-25.

Figure 8-25 Installing an RRU power cable

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

 Install 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 8-25.

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.

 The 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.

 The 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:

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

and MM indicates a multi-mode optical module.

 Color of the puller on an optical module: Blue indicates a single-mode optical module,

and black or gray indicates a multi-mode optical module.

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

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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 8-26.

Figure 8-26 Installing an optical module

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 8-27.

Figure 8-27 Installing an CPRI optical fiber cable

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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 8-28.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 8-28 Closing clips

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

8-29.

Figure 8-29 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 8-30.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

8 Installing RRU Cables

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

Figure 8-30 Closing the cover plate of the RRU cabling cavity

(1) Protection screw

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

properly inserted into troughs.

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

----End

eRelay DBS3900

RRU3252/RRU3256 Installation Guide

9 Checking the RRU Hardware Installation

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

Item

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

space requirement. Sufficient space is reserved for equipment maintenance.

The RRU is securely installed.

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

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.

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

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

soldered or crimped.

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

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

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

The protection grounding of the RRU and the surge protection grounding of the

building share one group of ground conductors.

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

cables are not damaged or broken.

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

jumper.

eRelay DBS3900

RRU3252/RRU3256 Installation Guide

10 Powering On an RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

eRelay DBS3900

RRU3252/RRU3256 Installation Guide

10 Powering On an RRU

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

DC.

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

and the ALM indicator is steady off.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

11 Appendix

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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.

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

11 Appendix

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

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

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

11 Appendix

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

100

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

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.

eRelay DBS3900 RRU3252/RRU3256 Installation Guide

11 Appendix

Issue Draft A (2012-11-30)

Huawei Proprietary and Confidential

101

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

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

----End

Huawei Technologies RRU3276 Remote Radio Unit User Manual RRU3252 RRU3256 Installation Guide

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

Contents

Installation Guide 2

Navigation menu

Namespaces

Views

Navigation