Huawei Technologies RRU3942 Multi-mode Multi-carriers Remote Radio Unit User Manual Installation Guide

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Installation Guide

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HUAWEI TECHNOLOGIES CO., LTD.

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

consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions

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

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

Notice

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

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

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

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

of any kind, either express or implied.

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

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

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

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base

Bantian, Longgang

Shenzhen 518129

People's Republic of China

Website: http://www.huawei.com

Email: support@huawei.com

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About This Document

Purpose

This document describes the process of installing a DC RRU3942 (referred to as RRU in this

document).

Product Version

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

Product Name Product Version

DBS3900 V100R004C00 and later versions

Intended Audience

This document is intended for:

Base station installation engineers

Organization

1 Changes in the RRU3942 Installation Guide

This chapter describes the changes in the RRU3942 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 and prerequisites 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

Unpack and check the delivered equipment to ensure that all the materials are included and intact.

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5 Installation Process

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

hardware installation, and powering on the RRU.

6 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. The procedure for installing the RRU varies depending on

installation options.

7 Installing RRU Cables

This chapter describes the procedure for installing RRU cables.

8 Checking the RRU Hardware Installation

After an RRU is installed, check the hardware installation.

9 Powering On an RRU

After all the devices are installed, check the power-on status of an RRU.

10 Appendix

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

connector.

Conventions

Symbol Conventions

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

Symbol Description

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

avoided, will result in death or serious injury.

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

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

Indicates a potentially hazardous situation, which if not

avoided, could result in equipment damage, data loss,

performance degradation, or unexpected results.

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

time.

Provides additional information to emphasize or supplement

important points of the main text.

General Conventions

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

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Convention Description

Times New Roman Normal paragraphs are in Times New Roman.

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

boldface. For example, log in as user root.

Italic Book titles are in italics.

Courier New Examples of information displayed on the screen are in

Courier New.

Command Conventions

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

Convention Description

Boldface The keywords of a command line are in boldface.

Italic Command arguments are in italics.

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

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

vertical bars. One item is selected.

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

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

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

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

items can be selected.

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

vertical bars. Several items or no item can be selected.

GUI Conventions

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

Convention Description

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

are in boldface. For example, click OK.

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

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

Keyboard Operations

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

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Format Description

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

Key 1+Key 2 Press the keys concurrently. For example, pressing Ctrl+Alt

+A means the three keys should be pressed concurrently.

Key 1, Key 2 Press the keys in turn. For example, pressing Alt, A means

the two keys should be pressed in turn.

Mouse Operations

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

Action Description

Click Select and release the primary mouse button without moving

the pointer.

Double-click Press the primary mouse button twice continuously and

quickly without moving the pointer.

Drag Press and hold the primary mouse button and move the

pointer to a certain position.

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Contents

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

1 Changes in the RRU3942 Installation Guide...........................................................................1

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

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

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

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

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

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

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

3.3 RRU Indicators...................................................................................................................................................9

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

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

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

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

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

4 Unpacking the Equipment.........................................................................................................24

5 Installation Process.....................................................................................................................26

6 Installing the RRU.......................................................................................................................27

6.1 Mounting Kits for an RRU...............................................................................................................................29

6.2 Installing the RRU on a Pole............................................................................................................................29

6.2.1 Installing a Single RRU...........................................................................................................................32

6.2.2 Installing Two RRUs...............................................................................................................................34

6.2.3 Installing Multiple RRUs.........................................................................................................................37

6.3 Installing the RRU on U-steel..........................................................................................................................40

6.4 Installing the RRU on Angle Steel...................................................................................................................44

6.5 Installing the RRU on a Wall...........................................................................................................................47

6.6 Hoisting an RRU onto a Tower........................................................................................................................51

7 Installing RRU Cables................................................................................................................55

7.1 Cabling Requirements......................................................................................................................................57

7.2 Cable Connections............................................................................................................................................62

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7.3 Installation Process...........................................................................................................................................65

7.4 RRU Cable List................................................................................................................................................66

7.5 Installing an RRU PGND Cable.......................................................................................................................68

7.6 Installing an RRU RF Jumper..........................................................................................................................70

7.7 Installing an Inter-RRU RF Cable....................................................................................................................72

7.8 Installing an RRU AISG Multi-Wire Cable and AISG Extension Cable.........................................................73

7.9 Opening the Cover Plate of an RRU Cabling Cavity.......................................................................................75

7.10 Installing an RRU power cable.......................................................................................................................77

7.11 Installing a CPRI Fiber Optic Cable...............................................................................................................79

7.12 Installing an RRU Alarm Cable......................................................................................................................81

7.13 Closing the Cover Plate of an RRU Cabling Cavity......................................................................................82

8 Checking the RRU Hardware Installation..............................................................................84

9 Powering On an RRU.................................................................................................................85

10 Appendix.....................................................................................................................................86

10.1 Adding an Easy Power Receptacle (Pressfit Type) Connector to the RRU Power Cable on the RRU Side

................................................................................................................................................................................87

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1 Changes in the RRU3942 Installation Guide

This chapter describes the changes in the RRU3942 Installation Guide.

02()

This is the second official release.

Compared with issue 01 (2011-09-30), this issue includes the following new information:

lHoisting an RRU and Related Cables onto a Tower

lHoisting Fiber Optic Cables onto a Tower

lHoisting Power Cables onto a Tower

Compared with issue 01 (2011-09-30), this issue includes the following changes:

Topic Change Description

4 Unpacking the Equipment Added the requirements for powering on the

cabinet and module.

7.1 Cabling Requirements Optimized cabling requirements.

Compared with issue 01 (2011-09-30), no information is deleted from this issue.

01 (2011-09-30)

This is the first official release.

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2 Installation Preparations

About This Chapter

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

the installation. In addition, it specifies the skills and prerequisites that installation engineers

must have.

2.1 Reference Documents

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

2.2 Tools and Instruments

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

2.3 Skills and Requirements for Onsite Personnel

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

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

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2.1 Reference Documents

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

The following reference documents are required during RRU installation:

lRRU3942 Hardware Description

lRRU3942 Hardware Maintenance Guide

lDBS3900 Installation Guide

lOCB User Guide

2.2 Tools and Instruments

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

Hammer drill (a φ 14 bit) ESD gloves Vacuum cleaner

Heat gun Phillips screwdriver (M3 to

M6)

Flat-head screwdriver (M3 to

M6)

Rubber mallet COAX crimping tool Wire stripper

Utility knife Cable cutter Adjustable wrench (capacity

≥ 32 mm [1.26 in.])

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Level Torque screwdriver

5 mm

(M3 to M6)

Torque wrench

Capacity: 17 mm [0.67 in.], 21

mm [0.82 in.], and 32 mm

[1.26 in.]

Combination wrench

Capacity: 17 mm [0.67 in.], 21

mm [0.82 in.], and 32 mm

[1.26 in.]

Multimeter Marker (diameter ≤ 10 mm

[0.39 in.])

Measuring tape

2.3 Skills and Requirements for Onsite Personnel

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

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

Before the installation, pay attention to the following items:

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

proper installation and operation methods.

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

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

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3 Information About the Installation

About This Chapter

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

physical supports, and installation clearance requirements.

3.1 RRU Exterior

This section describes the exterior and dimensions of an RRU.

3.2 RRU Ports

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

cabling cavity panel, and indicator panel.

3.3 RRU Indicators

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

3.4 Installation Options

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

angle steel, or wall.

3.5 Installation Clearance Requirements of an RRU

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

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

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3.1 RRU Exterior

This section describes the exterior and dimensions of an RRU.

Figure 3-1 shows an RRU.

Figure 3-1 RRU exterior

Figure 3-2 shows RRU dimensions.

Figure 3-2 RRU dimensions

3.2 RRU Ports

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

cabling cavity panel, and indicator panel.

Figure 3-3 shows RRU ports on the panels.

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Figure 3-3 RRU ports on the panels

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

Table 3-1 RRU ports and indicators on the panels

Item Label Description

(1) Ports at the bottom ANT_TX/RXA TX/RX port A, supporting RET signal

transmission

ANT_RXC RX port C

ANT_RXD Port RX port D

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Item Label Description

ANT_TX/RXB TX/RX port B

RX_IN/OUT Port for the inter-RRU RF cable

RET Communication port for the RET antenna,

supporting RET signal transmission

(2) Ports in the cabling

cavity

RTN(+) Power supply socket

NEG(-)

CPRI0 Optical/electrical port 0

CPRI1 Optical/electrical port 1

EXT_ALM Port for alarm reporting

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

ALM

ACT

VSWR

CPRI0/IR0

CPRI1/IR1

NOTE

The port for transmitting RET signals is determined by the software.

Table 3-2 describes how to use RF ports.

Table 3-2 Method of using RF ports

Product Version TX/RX Channel Number of Used

RF Ports

Method

MBTS V100R004 2T2R 2 ANT_TX/RXA is

used with ANT_TX/

RXB.

Versions later than

MBTS V100R004

One 1T2R 2 ANT_TX/RXA is

used with

ANT_RXC.

2 ANT_TX/RXB is

used with

ANT_RXD.

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Product Version TX/RX Channel Number of Used

RF Ports

Method

Two 1T2R 4 ANT_TX/RXA is

used with

ANT_RXC, and

ANT_TX/RXB is

used with

ANT_RXD.

2T2R 2 ANT_TX/RXA is

used with ANT_TX/

RXB.

3.3 RRU Indicators

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

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

Table 3-3 describes RRU indicators.

Table 3-3 RRU indicators

Label Color Status Description

RUN Green On There is power supply, but the module is

faulty.

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 On Alarms are generated, and the module must

be replaced.

Blinking (on for

1s and off for 1s)

Alarms are generated. The alarms may be

caused by the faults on the related boards or

ports. Therefore, the necessity for module

replacement is uncertain.

Off No alarm is generated.

ACT Green On The module is working properly with TX

channels enabled.

Blinking (on for

1s and off for 1s)

The module is working properly with TX

channels disabled.

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Label Color Status Description

VSWR Red Off No VSWR alarm is generated.

Blinking (on for

1s and off for 1s)

VSWR alarms are generated on the

ANT_TX/RXB port.

On VSWR alarms are generated on the

ANT_TX/RXA port.

Blinking (on for

0.125s and off for

0.125s)

VSWR alarms are generated on the

ANT_TX/RXA and ANT_TX/RXB ports.

CPRI0/IR0 Red and

green

Steady green The CPRI link is available.

Steady red An optical module fails to transmit or receive

signals because the optical module is faulty

or the fiber optic cable is broken.

Blinking red (on

for 1s and off for

1s)

The CPRI link is out of lock 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 identify the fault).

Off The SFP module is not properly installed, or

the optical module is powered off.

CPRI1/IR1 Red and

green

Steady green The CPRI link is available.

Steady red An optical module fails to transmit or receive

signals because the optical module is faulty

or the fiber optic cable is broken.

Blinking red (on

for 1s and off for

1s)

The CPRI link is out of lock 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 identify the fault).

Off The SFP module is not properly installed, or

the optical module is powered off.

3.4 Installation Options

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

angle steel, or wall.

Installing an RRU on a Pole

Figure 3-4 shows the diameter of pole for installing an AAU3801.

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Figure 3-4 Diameter of a pole

CAUTION

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

in.). The recommended diameter is 80 mm (3.15 in.).

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

two RRUs can be installed on the pole and the side-mounted installation is not recommended.

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

Figure 3-5 RRU installed on a pole

Installing an RRU on U-steel

Figure 3-6 shows U-steel specifications.

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Figure 3-6 U-steel specifications

CAUTION

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

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

Figure 3-7.

Figure 3-7 Requirements for the vertical deviation angle of U-steel or angle steel

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

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

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Figure 3-8 RRU installed on U-steel

Installing an RRU on Angle Steel

Figure 3-9 shows angle steel specifications.

Figure 3-9 Angle steel specifications

CAUTION

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

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

in Figure 3-7.

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

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Figure 3-10 RRU installed on angle steel

Installing an RRU on a Wall

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

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

weight of the RRU.

lExpansion bolts must be tightened to 30 N·m (265.52 lbf·in.) to ensure the bolts work

properly and the wall remains intact without cracks in it.

CAUTION

The brackets cannot be combined when RRUs are installed on a wall, as shown in Figure

3-11.

Figure 3-11 Correct placement of brackets

Figure 3-12 shows an RRU installed on a wall.

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Figure 3-12 RRU installed on a wall

3.5 Installation Clearance Requirements of an RRU

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

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

NOTE

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

Operation and Maintenance (O&M). 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 Installation Clearance for a Single RRU

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

Recommended Installation Clearance for a Single RRU

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

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Figure 3-13 Recommended installation clearance for a single RRU

Minimum Installation Clearance for a Single RRU

Figure 3-14 shows the minimum installation clearance for a single RRU.

Figure 3-14 Minimum installation clearance for a single RRU

Minimum Installation Clearance for a Single RRU Installed on a Tower

Figure 3-15 shows the minimum installation clearance for a single RRU installed on a tower.

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

3.5.2 Installation Clearance for Multiple RRUs

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

Recommended Installation Clearance for Multiple RRUs Installed in Centralized

Mode

Figure 3-16 shows the recommended installation clearance for multiple RRUs installed in

centralized mode.

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

mode

Minimum Installation Clearance for Multiple RRUs Installed in Centralized Mode

Figure 3-17 shows the minimum installation clearance for multiple RRUs installed in centralized

mode.

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

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Recommended Clearance for Multiple RRUs Installed on a Wall in Standard Mode

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

mode.

Figure 3-18 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 3-19 shows the minimum clearance for multiple RRUs installed on a wall in standard

mode.

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Figure 3-19 Minimum clearance for multiple RRUs installed on a wall in standard mode

Recommended Clearance for Multiple RRUs Side-Mounted on a Wall

Figure 3-20 shows the recommended clearance for multiple RRUs side-mounted on a wall.

Figure 3-20 Recommended clearance for multiple RRUs side-mounted on a wall

3.5.3 Installation Spacing Between RRUs

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

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Recommended Horizontal Spacing Between RRUs

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

Figure 3-21 Recommended horizontal spacing between RRUs

Minimum Horizontal Spacing Between RRUs

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

Figure 3-22 Minimum horizontal spacing between RRUs

Recommended Vertical Spacing Between RRUs

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

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Figure 3-23 Recommended vertical spacing between RRUs

Minimum Vertical Spacing Between RRUs

Figure 3-24 shows the minimum vertical spacing between RRUs.

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Figure 3-24 Minimum vertical spacing between RRUs

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4 Unpacking the Equipment

Unpack and check the delivered equipment to ensure that all the materials are included and intact.

Context

NOTE

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

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

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

soaked gloves, or dirty gloves.

CAUTION

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

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

Procedure

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

If ... Then ...

The total number tallies with the packing

list

Go to Step 2.

The total number does not tally with the

packing list

Find out the cause and report any missing

articles to the local Huawei office.

Step 2 Check the exterior of the packing case.

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If ... Then ...

The outer packing is intact Go to Step 3.

The outer packing is severely damaged or

soaked

Find out the cause and report it to the local

Huawei office.

The vibrating indicator 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.

There is any shipment shortage or wrong

shipment

Fill in and submit the Cargo Shortage and

Mishandling Report.

Articles are damaged. Fill in and submit the Article Replacement

Report.

WARNING

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

unpacked equipment and packing materials indoors, take photos of the stocking environment,

packing case or carton, packing materials, and any rusted or eroded equipment, and then file the

photos.

----End

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5 Installation Process

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

hardware installation, and powering on the RRU.

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

Figure 5-1 Process of installing an RRU

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6 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. The procedure for installing the RRU varies depending on

installation options.

CAUTION

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

bottom is low.

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

during the installation.

6.1 Mounting Kits for an RRU

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

6.2 Installing the RRU on a Pole

One or more RRUs can be installed on a pole.

6.3 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.

6.4 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.

6.5 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.

6.6 Hoisting an RRU onto a Tower

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Before installing an RRU on a tower, bind the RRU and mounting kits and then hoist them onto

the tower. The RRU can be installed on a pole, U-steel, or angle steel. This section describes the

procedure for hoisting the RRU and mounting kits onto the tower and the precautions that must

be taken.

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6.1 Mounting Kits for an RRU

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

Figure 6-1 shows the front and rear view of an RRU.

Figure 6-1 Front and rear view of an RRU

(1) Cover plate (2) Attachment plate

Figure 6-2 shows the bracket assembly for an RRU.

Figure 6-2 Bracket assembly for an RRU

(1) Auxiliary mounting

bracket

(2) Dual-nut bolt assembly (3) Main mounting bracket (4) Hoist clamp on the

main mounting bracket

6.2 Installing the RRU on a Pole

One or more RRUs can be installed on a pole.

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Figure 6-3 shows a single RRU installed on a pole.

Figure 6-3 A single RRU installed on a pole

Figure 6-4 shows two RRUs installed on a pole.

Figure 6-4 Two RRUs installed on a pole

Figure 6-5, Figure 6-6, and Figure 6-7 show more than two RRUs installed on a pole.

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Figure 6-5 Three RRUs installed on a pole in centralized mode

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

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

6.2.1 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.

Prerequisite

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

For details, see 6.6 Hoisting an RRU onto a Tower.

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

Procedure

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

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

RRU to determine a position.

lIf the RRU must be installed on the ground, see Figure 6-8 to determine a position.

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Figure 6-8 Distance between the main mounting bracket and the ground

Step 2 Fit one end of the auxiliary mounting bracket to one dual-nut bolt assembly of the main mounting

bracket.

Step 3 Install the bracket assembly on the pole, and then fit the other end of the auxiliary mounting

bracket to the other dual-nut bolt assembly, as shown in Figure 6-9.

Figure 6-9 Installing the bracket assembly

NOTE

Verify that the arrow on the main mounting bracket is pointing up.

Step 4 Using a torque wrench, tighten the nuts to 40 N·m (354.03 lbf·in.) to secure the bracket assembly

onto the pole, as shown in Figure 6-10.

CAUTION

Tighten the two dual-nut bolt assemblies alternatively. After the main and auxiliary brackets are

secured properly, measure the spacing between the brackets on both sides and ensure that the

spacing is the same on the two sides.

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Figure 6-10 Securing the bracket assembly onto the pole

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

6-11.

Figure 6-11 Installing the RRU on the main mounting bracket

----End

6.2.2 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.

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Procedure

Step 1 Install the first RRU, as shown in Figure 6-12. For details, see 6.2.1 Installing a Single RRU.

Figure 6-12 Installing the first RRU

Step 2 Install the other main mounting bracket on the auxiliary mounting bracket to secure the second

RRU, as shown in Figure 6-13.

Figure 6-13 Installing the second main mounting bracket

Step 3 Interchange the cover plate and plastic screws in the front and the attachment plate and stainless

steel screws at the rear of the second RRU, as shown in Figure 6-14.

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Figure 6-14 Interchanging the cover plate in the front and the attachment plate at the rear of the

second RRU

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

2. Remove the cover plate from the RRU front, and use a Phillips screwdriver to remove the

plastic screws from the RRU.

3. Install the plastic screws onto the RRU rear, and tighten the screws to 0.25 N·m (2.21 lbf·in.)

using a torque screwdriver.

4. Install the cover plate onto the RRU rear.

5. Install the attachment plate onto the RRU front, and tighten the stainless steel screws on

the attachment plate to 5 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 6-15.

Figure 6-15 Installing the second RRU on the main mounting bracket

----End

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6.2.3 Installing Multiple RRUs

The section describes the procedure for installing multiple RRUs on a pole and the precautions

that must be taken during the installation.

Context

A pole supports the installation of three, four, or six RRUs. The procedures for installing them

are the same. Following is the procedure of installing four RRUs on a pole.

Procedure

Step 1 Install one set of bracket assembly on a pole. For details, see 6.2.1 Installing a Single RRU.

Step 2 Interchange the attachment plate and stainless steel screws at the RRU rear and the cover plate

and plastic screws on the RRU side, as shown in Figure 6-16.

Figure 6-16 Interchanging the attachment plate at the RRU rear and the cover plate on the RRU

side

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

2. Remove the cover plate from the RRU side, and use a Phillips screwdriver to remove the

plastic screws from the RRU.

3. Install the plastic screws onto the RRU rear, and tighten the screws to 0.25 N·m (2.21 lbf·in.)

using a torque screwdriver.

4. Install the cover plate onto the RRU rear.

5. Install the attachment plate onto the RRU side, and tighten the stainless steel screws on the

attachment plate to 5 N·m (44.25 lbf·in.) using a torque screwdriver.

Step 3 Install the first RRU on the main mounting bracket, as shown in Figure 6-17.

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Figure 6-17 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 6-18.

Figure 6-18 Installing the second main mounting bracket

Step 5 Install the second RRU on the second main mounting bracket, as shown in Figure 6-19.

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Figure 6-19 Installing the second RRU on the second main mounting bracket

Step 6 Install the third main mounting bracket, and then install the third RRU on the main mounting

bracket, as shown in Figure 6-20.

Figure 6-20 Installing the third RRU on the third main mounting bracket

Step 7 Install the fourth main mounting bracket, as shown in Figure 6-21.

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Figure 6-21 Installing the fourth main mounting bracket

Step 8 Install the fourth RRU on the fourth main mounting bracket, as shown in Figure 6-22.

Figure 6-22 Installing the fourth RRU on the fourth main mounting bracket

----End

6.3 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.

Prerequisite

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

For details, see 6.6 Hoisting an RRU onto a Tower.

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

Context

Figure 6-23 shows the top view of the RRU installed on U-steel.

Figure 6-23 Top view of the RRU

(1) U-steel

Procedure

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

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

RRU to determine a position.

lIf the RRU must be installed on the ground, see Figure 6-24 to determine a position.

Figure 6-24 Distance between the main mounting bracket and the ground

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NOTE

It is recommended that the main mounting bracket be 1,200 mm (47.24 in.) to 1,600 mm (62.99 in.)

above the ground.

Step 2 Fit one end of the auxiliary mounting bracket to one dual-nut bolt assembly of the main mounting

bracket.

Step 3 Install the bracket assembly on U-steel, and then fit the other end of the auxiliary mounting

bracket to the other dual-nut bolt assembly, as shown in Figure 6-25.

Figure 6-25 Installing the bracket assembly

NOTE

Verify that the arrow on the main mounting bracket is pointing up.

Step 4 Using a torque wrench, tighten the nuts to 40 N·m (354.03 lbf·in.) to secure the bracket assembly

onto the U-steel, as shown in Figure 6-26.

CAUTION

Tighten the two dual-nut bolt assemblies alternatively. After the main and auxiliary brackets are

secured properly, measure the spacing between the brackets on both sides and ensure that the

spacing is the same on the two sides.

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Figure 6-26 Securing the bracket assembly onto U-steel

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

6-27.

Figure 6-27 Installing the RRU on the main mounting bracket

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Figure 6-28 Installing the RRU on the main mounting bracket

----End

6.4 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.

Prerequisite

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

For details, see 6.6 Hoisting an RRU onto a Tower.

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

Context

Figure 6-29 shows the top view of the RRU installed on angle steel.

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Figure 6-29 Top view of the RRU

(1) Angle steel

Procedure

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

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

RRU to determine a position.

lIf the RRU must be installed on the ground, see Figure 6-30 to determine a position.

Figure 6-30 Distance between the main mounting bracket and the ground

NOTE

It is recommended that the main mounting bracket be 1,200 mm (47.24 in.) to 1,600 mm (62.99 in.)

above the ground.

Step 2 Fit one end of the auxiliary mounting bracket to one dual-nut bolt assembly of the main mounting

bracket.

Step 3 Install the bracket assembly on angle steel, and then fit the other end of the auxiliary mounting

bracket to the other dual-nut bolt assembly, as shown in Figure 6-31.

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Figure 6-31 Installing the bracket assembly

NOTE

Verify that the arrow on the main mounting bracket is pointing up.

Step 4 Using a torque wrench, tighten the nuts to 40 N·m (354.03 lbf·in.) to secure both the bracket

assembly onto the angle steel, as shown in Figure 6-32.

CAUTION

Tighten the two dual-nut bolt assemblies alternatively. After the main and auxiliary brackets are

secured properly, measure the spacing between the brackets on both sides and ensure that the

spacing is the same on the two sides.

Figure 6-32 Securing the bracket assembly onto angle steel

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

6-33.

Figure 6-33 Installing the RRU on the main mounting bracket

----End

6.5 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.

Prerequisite

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

Context

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

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

weight of the RRU.

lExpansion bolts must be tightened to 30 N·m (265.52 lbf·in.) to ensure the bolts work

properly and the wall remains intact without cracks in it.

Procedure

Step 1 Place the auxiliary mounting bracket against the installation position, use a level to verify that

the auxiliary mounting bracket is placed horizontally, and then mark anchor points with a marker,

as shown in Figure 6-34.

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Figure 6-34 Marking anchor points

(1) Auxiliary mounting bracket (2) RRU

NOTE

It is recommended that the auxiliary mounting bracket be 1,200 mm (47.24 in.) to 1,600 mm (62.99 in.) above

the ground.

Figure 6-35 Expansion bolt assembly

(1) M10x65 bolt (2) Spring washer 10 (3) Plastic tube (4) Flat washer 10 (5) Expansion tube

Step 2 Drill holes at the anchor points, and then insert expansion bolt assemblies, as shown in Figure

6-36.

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Figure 6-36 Drilling a hole and inserting an expansion bolt assembly

1. Use a hammer drill with a φ14 bit to drill holes vertically at the marked anchor points.

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

WARNING

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

before drilling holes.

2. Hit the expansion bolt with a rubber mallet until the expansion tube completely enters the

hole.

3. Tighten an expansion bolt slightly and place it vertically into each hole.

4. Remove the M10x65 bolt, spring washer, plastic tube, and flat washer from each expansion

bolt assembly in sequence.

NOTE

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

5. Hammer the bolt into the wall.

CAUTION

Do not hammer the expansion bolt entirely into the wall. Instead, leave 20 mm (0.79 in.)

to 30 mm (1.18 in.) of the expansion bolt outside the wall.

Step 3 Fit the auxiliary mounting bracket on the expansion bolt, and then use a torque wrench (17 mm

[0.67 in.]) to tighten the expansion bolt to 30 N·m (265.52 lbf·in.), as shown in Figure 6-37.

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Figure 6-37 Fitting the auxiliary mounting bracket on expansion bolts

CAUTION

Verify that the arrow on the auxiliary mounting bracket is pointing up.

Step 4 Loosen the screws on the main mounting bracket and store them properly.

Step 5 Install the main mounting bracket, as shown in Figure 6-38.

Figure 6-38 Installing the main mounting bracket

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Step 6 Install the RRU on the main mounting bracket until the RRU snaps shut, as shown in Figure

6-39.

Figure 6-39 Installing the RRU

----End

6.6 Hoisting an RRU onto a Tower

Before installing an RRU on a tower, bind the RRU and mounting kits and then hoist them onto

the tower. The RRU can be installed on a pole, U-steel, or angle steel. This section describes the

procedure for hoisting the RRU and mounting kits onto the tower and the precautions that must

be taken.

Prerequisite

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

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

ports at the RRU bottom is low.

CAUTION

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

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

the side, and the brackets for more than two RRUs cannot be combined.

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Procedure

Step 1 Bind the RRU and mounting kits properly using a lifting sling, as shown in Figure 6-40.

Figure 6-40 Binding mounting kits for the RRU

Step 2 Lead one sling through the lifting eye and RRU handle and use the sling as a lifting sling, and

lead the other sling through the RRU handle and use the sling as a traction sling, as shown in

Figure 6-41.

Figure 6-41 Binding the RRU

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

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CAUTION

lEach sling has a maximum load-bearing capacity of 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 traction sling [by the knot]

must not be greater than 60 degrees.

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

the ground and tower.

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

lDo not hoist the RRU by the handle or lifting eye only, as shown in Figure 6-42 and Figure

6-43.

Figure 6-42 Incorrect binding method

Figure 6-43 Incorrect binding method

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Step 3 Hoist the RRU and mounting kits onto the tower respectively, as shown in Figure 6-44.

NOTE

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

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

Figure 6-44 Hoisting the RRU onto the tower

(1) Traction sling (2) Lifting sling (3) 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 C binds the RRU using the lifting sling and secures the traction sling

to the RRU handle.

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

the traction sling outwards to protect the RRU and mounting kits from colliding with the

tower.

4. Installation engineer A catches the RRU, install the RRU on the main mounting bracket

until the RRU snaps shut, and then unties the sling.

NOTE

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

----End

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7 Installing RRU Cables

About This Chapter

This chapter describes the procedure for installing RRU cables.

7.1 Cabling Requirements

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

interference.

7.2 Cable Connections

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

7.3 Installation Process

This section describes the process of installing RRU cables.

7.4 RRU Cable List

This section describes RRU cable connections.

7.5 Installing an RRU PGND Cable

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

7.6 Installing an RRU RF Jumper

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

7.7 Installing an Inter-RRU RF Cable

This section describes the procedure for installing the inter-RRU RF cable.

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

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

extension cable.

7.9 Opening the Cover Plate of an RRU Cabling Cavity

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

7.10 Installing an RRU power cable

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

7.11 Installing a CPRI Fiber Optic Cable

This section describes the procedure for installing a CPRI fiber optic cable.

7.12 Installing an RRU Alarm Cable

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

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7.13 Closing the Cover Plate of an RRU Cabling Cavity

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

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7.1 Cabling Requirements

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

interference.

NOTE

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

General Cabling Requirements

Requirements for Bending Radius

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

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

lThe bending radius of the 1/4'' jumper must be more than 35 mm (1.38 in.). The bending

radius of the super-flexible 1/2'' jumper must be more than 50 mm (1.97 in.), and the bending

radius of the ordinary 1/2'' jumper must be more than 127 mm (5 in.).

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

diameter of the cable.

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

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

cable is 30 mm (1.18 in.).

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

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

Requirements for Cable Binding

lThe same types of cable must be bound together.

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

(1.18 in.) and cannot be entangled.

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

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

in a straight line.

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

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

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

installed.

Security Requirements

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

inevitable, protect the cables with protection pipes.

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

between cables and heat sources.

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

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

Indoor Cabling Requirements

lCables are routed indoors through the feeder window.

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

bending radius are met.

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

lThe feeder window must be waterproofed.

Outdoor Cabling Requirements

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

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

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

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

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

the cabinet bottom with metal piece.

lIf cables at the cabinet bottom need to be routed through a pipe along the metal cable trough,

do not lead the pipe into the cabinet base. The cable trough must be sealed and routed

through the cable hole at the cabinet bottom.

lCables are secured with cable clips.

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

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

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

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

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

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

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

Secure cables on the cable tray, as shown in Figure 7-1.

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Figure 7-1 Securing cables on the cable tray

Secure cables on the tower, as shown in Figure 7-2.

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Figure 7-2 Securing cables on the tower

Special Cabling Requirements

Cabling Requirements for Power Cables

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

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

or soldering joints to lengthen the cables.

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

made.

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lCables are routed in an untangled and orderly fashion.

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

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

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

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

securing the cables.

Cabling Requirements for PGND Cables

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

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

overhead before they are led into the equipment room.

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

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

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

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

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

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

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

terminal.

Cabling Requirements for E1 Cables

lE1 cables must not cross power cables, PGND cables, or RF cables when routed. If

transmission cables are routed with power cables, PGND cables, or RF cables in parallel,

the spacing between them must be greater than 30 mm (1.18 in.).

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

lSufficient slack is provided in E1 cables at turns.

Cabling Requirements for Fiber Optic Cables

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

all preparations are made.

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

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

lCables are routed in an untangled and orderly fashion.

lDo not bind fiber optic cables at turns.

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

from sharp objects.

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

devices, such as a fiber coiler.

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

lVacant optical connectors must be covered with dustproof caps.

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

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

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

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

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

securing the cables.

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

secure them on the tower.

7.2 Cable Connections

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

NOTE

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

RRU using a power cable.

Figure 7-3 shows the cable connections for a single RRU in the single-mode scenario.

Figure 7-3 Cable connections for a single RRU in the single-mode scenario

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

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

(7) RRU alarm cable - -

Figure 7-4 shows the cable connections for a single RRU in the multi-mode scenario.

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Figure 7-4 Cable connections for a single RRU in the multi-mode scenario

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

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

(7) RRU alarm cable - -

Figure 7-5 shows the cable connections for multiple RRUs in the single-mode scenario.

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Figure 7-5 Cable connections for multiple RRUs in the single-mode scenario

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

(4) CPRI fiber optic cable - -

Figure 7-6 shows the CPRI fiber optic cable connections for multiple RRUs in the multi-mode

scenario.

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Figure 7-6 CPRI fiber optic cable connections for multiple RRUs in the multi-mode scenario

7.3 Installation Process

This section describes the process of installing RRU cables.

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

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Figure 7-7 Process of installing RRU cables

7.4 RRU Cable List

This section describes RRU cable connections.

Table 7-1 lists RRU cables.

Table 7-1 RRU cables

Cable One End The Other End

Connector Installation

Position

Connector Installation

Position

RRU PGND

Cable

OT terminal (M6,

16 mm2 [0.025 in.

2])

Ground

terminal on the

RRU

OT terminal

(M8, 16 mm2

[0.025 in.2])

Ground terminal

on the ground bar

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Cable One End The Other End

Connector Installation

Position

Connector Installation

Position

RRU Power

Cable

Easy power

receptacle

(pressfit type)

connector

NEG(-) and

RTN(+) ports

on the RRU

Easy power

receptacle

(pressfit type)

connector

One of RRU0 to

RRU5 ports on

the EPU

One of LOAD0 to

LOAD5 ports on

the DCDU-11B

RRU Alarm

Cable

DB15 connector EXT_ALM

port on the

RRU

Cord end

terminal

External alarm

device

CPRI Fiber

Optic Cable

(in multi-

mode

scenarios)

DLC connector CPRI0 port on

the RRU

CPRI1 port on

the RRU

DLC connector GSM+UMTS

(GU) mode

CPRI port on the

GTMU in the

BBU

CPRI port on the

WBBP in the

BBU

GSM+LTE (GL)

mode

CPRI port on the

GTMU in the

BBU

CPRI port on the

LBBP in the BBU

UMTS+LTE

(UL) mode

CPRI port on the

WBBP in the

BBU

CPRI port on the

LBBP in the BBU

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Cable One End The Other End

Connector Installation

Position

Connector Installation

Position

CPRI Fiber

Optic Cable

(in single-

mode

scenarios)

DLC connector CPRI0 port on

the RRU

DLC connector GSM only (LO)

mode

CPRI port on the

GTMU in the

BBU

UMTS only (LO)

mode

CPRI port on the

WBBP in the

BBU

LTE only (LO)

mode

CPRI port on the

LBBP in the BBU

RRU RF

Jumper

DIN male

connector

ANT_TX/

RXA or

ANT_TX/

RXB port on

the RRU

DIN male

connector

Antenna system

Inter-RRU

RF Cable

DB2W2

connector

RX_IN/OUT

port on the

RRU

DB2W2

connector

RX_IN/OUT port

on the RRU

RRU AISG

Multi-Wire

Cable

Waterproofed

DB9 male

connector

RET port on

the RRU

Standard AISG

female connector

Standard AISG

male connector

on the RCU or on

the AISG

extension cable

RRU AISG

Extension

Cable

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

7.5 Installing an RRU PGND Cable

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

Context

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

two ends of the cable are M6 and M8 terminals respectively.

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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

7-8.

Figure 7-8 Installing an RRU PGND cable

NOTE

Crimp OT terminals in correct positions, as shown in Figure 7-9.

Figure 7-9 Correct position of an OT terminal

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

----End

7.6 Installing an RRU RF Jumper

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

Procedure

Step 1 Link the DIN connector at one end of the RF jumper to the ANT port and use a torque wrench

to tighten the connector to 25 N·m (221.27 lbf·in.), as shown in Figure 7-10.

Figure 7-10 Installing an RRU RF jumper

CAUTION

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

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

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

Step 2 Link 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 7-11.

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Figure 7-11 Waterproofing a connector of the RF jumper

(1) Waterproof tape (2) PVC insulation tape

NOTE

lBefore wrapping waterproof tape, stretch the tape evenly until the width of the tape is half of its original

width.

lWrap each layer of tape around the connector tightly and neatly, and ensure that each layer of tape overlaps

more than 50% of the preceding layer.

1. Wrap each connector with three layers of waterproof tape, from bottom up, then from top

down, and finally from bottom up. Start the wrapping at the position 50 mm (1.97 in.) away

from the bottom of the connector. 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.

2. Wrap each connector with three layers of PVC insulation tape, from bottom up, then from

top down, and finally from bottom up. Start the wrapping at the position 30 mm (1.18 in.)

away from the bottom of the connector. 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 Check the dustproof caps on antenna connectors. In outdoor scenarios, dustproof caps must be

waterproofed, as shown in Figure 7-12.

CAUTION

Do not remove dustproof caps from vacant antenna connectors.

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Figure 7-12 Waterproofing a dustproof cap

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

NOTE

lBefore wrapping waterproof tape, stretch the tape evenly until the width of the tape is half of its original

width.

lWrap each layer of tape around the connector tightly and neatly, and ensure that each layer of tape overlaps

more than 50% of the preceding layer.

1. Verify that dustproof caps are not removed.

2. Wrap each dustproof cap with three layers of waterproof tape, 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.

3. Wrap each dustproof cap with three layers of PVC insulation tape, 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 Lay out the jumper by referring to 7.1 Cabling Requirements, and then bind the jumper using

cable ties.

Step 6 Label the installed jumper 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

7.7 Installing an Inter-RRU RF Cable

This section describes the procedure for installing the inter-RRU RF cable.

Procedure

Step 1 Link the DB2W2 connector at one end of the RF cable to the RX_IN/OUT port of an RRU, and

link the other end to the RX_IN/OUT port of the other RRU, as shown in Figure 7-13.

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Figure 7-13 Installing an inter-RRU RF cable

Step 2 Lay out the cable by referring to 7.1 Cabling Requirements, and then bind the cable using cable

ties.

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

----End

7.8 Installing an RRU AISG Multi-Wire Cable and AISG

Extension Cable

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

extension cable.

Context

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

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

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

Procedure

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

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

RET port on the RRU bottom, as shown in Figure 7-14.

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Figure 7-14 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. Lay out the cable by referring to 7.1 Cabling Requirements, and then bind the cable

using cable ties.

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

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

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

RET port on the RRU bottom, and link the other end to the standard AISG male

connector of the AISG extension cable, as shown in Figure 7-15.

Figure 7-15 Installing an RRU AISG multi-wire cable

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

connector on the RCU, as shown in Figure 7-16.

Figure 7-16 Installing an RRU AISG multi-wire cable

3. Lay out the cable by referring to 7.1 Cabling Requirements, and then bind the cable

using cable ties.

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

----End

7.9 Opening the Cover Plate of an RRU Cabling Cavity

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

Procedure

Step 1 Wear ESD gloves.

CAUTION

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

damage to the boards, modules, or electronic components.

Step 2 Loosen the protection screw on the cover plate of the RRU cabling cavity using an M4 Phillips

screwdriver, and then lower the handle to open the cover plate, as shown in Figure 7-17.

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Figure 7-17 Opening the cover plate of the RRU cabling cavity

(1) Protection screw

Figure 7-18 shows the RRU cabling cavity.

Figure 7-18 RRU cabling cavity

(1) Cover plate (2) Cable diagram on labels (3) Cable trough for the fiber optic

cable

(4) Cable trough for the power

cable

(5) Cable trough for the alarm cable (6) Waterproof block

(7) Clip (8) Cabling cavity -

Step 3 Loosen the screws on the clip, and open the clip, as shown Figure 7-19.

NOTE

Open the clip only for the associated cable.

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Figure 7-19 Opening clips

----End

7.10 Installing an RRU power cable

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

Prerequisite

lAn easy power receptacle (pressfit type) connector is added to the RRU power cable on

the RRU side. For details, see 10.1 Adding an Easy Power Receptacle (Pressfit Type)

Connector to the RRU Power Cable on the RRU Side.

lA connector or OT terminals are added to the RRU power cable on the power device side.

For details, see the DBS3900 Installation Guide.

Context

The cross-sectional area of the RRU power cable is 6 mm2 (0.009 in.2).

Procedure

lInstall an RRU power cable that feeds power to an RRU from a DCDU-11B when the

DCDU-11B is configured.

1. Link the easy power receptacle (pressfit type) connector at one end of the RRU power

cable to the power supply socket on the RRU, as shown in Figure 7-20.

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Figure 7-20 Installing an RRU power cable

CAUTION

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

the clip.

2. Link the easy power receptacle (pressfit type) connector at the other end of the RRU

power cable to the LOAD0 port on the DCDU-11B.

NOTE

One DCDU-11B can supply power to a maximum of six RRUs. The RRU power cable can be

connected to any wiring terminal from LOAD0 to LOAD5 on the DCDU-11B.

3. Lay out the cable by referring to 7.1 Cabling Requirements, and then bind the cable

using cable ties.

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

lInstall an RRU power cable that feeds power to an RRU from an EPU when the EPU is

configured.

1. Link the easy power receptacle (pressfit type) connector at one end of the RRU power

cable to the power supply socket on the RRU, as shown in Figure 7-20.

2. Link the easy power receptacle (pressfit type) connector at one end of the RRU power

cable to the RRU0 port on the EPU subrack.

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NOTE

lThe blue core wire in the easy power receptacle (pressfit type) connector is linked to the

left port on the EPU subrack, and the black/brown core wire is linked to the right port on

the EPU subrack.

lThe EPU 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 EPU.

3. Lay out the cable by referring to 7.1 Cabling Requirements, and then bind the cable

using cable ties.

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

----End

7.11 Installing a CPRI Fiber Optic Cable

This section describes the procedure for installing a CPRI fiber optic cable.

Prerequisite

Before the installation, single-mode optical modules can be distinguished from multi-mode

optical modules in either of the following ways:

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

MM indicates a multi-mode optical module.

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

black or gray indicates a multi-mode optical module.

CAUTION

The optical modules to be installed must match CPRI rates.

Context

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

For details about CPRI fiber optic cable connections, see the descriptions of connections for the

CPRI fiber optic cable in the BBU3900 Hardware Description.

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 then raise the pullers, as

shown in Figure 7-21.

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Figure 7-21 Installing an optical module

CAUTION

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

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

within 20 minutes.

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

side, as shown in Figure 7-22.

Figure 7-22 Installing a CPRI fiber optic cable

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CAUTION

Install the fiber optic cable in the cable clip near the power cable to leave some slack at the bend.

Tighten the screws on the cable clip to 1.4 N·m (12.39 lbf·in.).

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

side.

Step 4 Lay out the fiber optic cable by referring to 7.1 Cabling Requirements, and then bind the cable

using cable ties.

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

----End

7.12 Installing an RRU Alarm Cable

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

Procedure

Step 1 Link the DB15 connector at one end of the RRU alarm cable to the EXT_ALM port on the RRU,

and link the eight cord end terminals at the other end to the external alarm device, as shown in

Figure 7-23.

Figure 7-23 Installing an RRU alarm cable

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Step 2 Lay out the cable by referring to 7.1 Cabling Requirements, and then bind the cable using cable

ties.

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

----End

7.13 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 tighten the screws on each clip to 1.4 N·m (12.39 lbf·in.) using a torque

screwdriver, as shown in Figure 7-24.

Figure 7-24 Closing clips

CAUTION

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

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

7-25.

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Figure 7-25 Correct placement of waterproof blocks

Step 3 Close the cover plate of the RRU cabling cavity and tighten the screws on the cover plate to 0.8

N·m (7.08 lbf·in.) using a torque screwdriver, as shown in Figure 7-26.

Figure 7-26 Closing the cover plate of the RRU cabling cavity

(1) Protection screw

CAUTION

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

properly inserted into troughs.

lTighten the screws on the cover plate in the sequence shown in the figure.

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

----End

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8 Checking the RRU Hardware Installation

After an RRU is installed, check the hardware installation.

Table 8-1 provides the checklist for the RRU hardware installation.

Table 8-1 Checklist for the RRU hardware installation

SN Item

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

space requirement. Sufficient space is reserved for equipment maintenance.

2 The RRU is securely installed.

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

4 Waterproof blocks are securely installed in vacant cable troughs of the RRU cabling

cavity, and the cover plate for the cabling cavity is securely installed. In addition,

vacant RF ports are covered with dustproof caps and the caps are tightened.

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

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

or crimped.

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

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

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

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

building share one group of ground conductors.

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

are not damaged or broken.

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

jumper.

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9 Powering On an RRU

After all the devices are installed, check the power-on status of an RRU.

CAUTION

After you unpack an RRU, you must power on it within 24 hours. If you power off the RRU for

maintenance, you must restore power to the RRU within 24 hours.

Figure 9-1 shows the RRU power-on check process.

Figure 9-1 RRU power-on check process

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10 Appendix

About This Chapter

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

connector.

10.1 Adding an Easy Power Receptacle (Pressfit Type) Connector to the RRU Power Cable on

the RRU Side

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

connector to the RRU power cable on the RRU side.

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10.1 Adding an Easy Power Receptacle (Pressfit Type)

Connector to the RRU Power Cable on the RRU Side

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

connector to the RRU power cable on the RRU side.

Procedure

Step 1 Figure 10-1 shows the cable diagram on labels.

Figure 10-1 Cable diagram on labels

(1) Cable diagram on labels

Step 2 Determine the length of the power cable for different operations based on the labels, as shown

in Figure 10-2.

Figure 10-2 Determining the length of the power cable

Step 3 Strip the specified length of the sheath off the power cable, as shown in Figure 10-3.

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Figure 10-3 Stripping the specified length of sheath

Step 4 Strip a specified length of sheath off each core wire. The length must be consistent with the

length of the notch in the easy power receptacle (pressfit type) connector, as shown in Figure

10-4.

Figure 10-4 Stripping the sheath off each core wire

Figure 10-5 Matched length

Step 5 Add an easy power receptacle (pressfit type) connector to two core wires.

1. Tighten the screws using a Phillips screwdriver, as shown in Figure 10-6.

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Figure 10-6 Tightening screws

2. Connect the blue core wire labeled NEG(-) to the - port and the black/brown core wire

labeled RTN(+) to the + port on the easy power receptacle (pressfit type) connector, and

then tighten the screws using a Phillips screwdriver, as shown in Figure 10-7.

Figure 10-7 Adding an easy power receptacle (pressfit type) connector to two core wires

Step 6 Strip the specified length of the sheath off the power cable to expose the intact shield layer, as

shown in Figure 10-8.

Figure 10-8 Stripping the sheath off the power cable

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CAUTION

Each core wire is exposed outside the easy power receptacle (pressfit type) connector for 1.5

mm (0.059 [in.]), as shown in Figure 10-9.

Figure 10-9 Inserting core wires into the easy power receptacle (pressfit type) connector

----End

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Huawei Technologies RRU3942 Multi-mode Multi-carriers Remote Radio Unit User Manual Installation Guide

Huawei Technologies Co.,Ltd Multi-mode Multi-carriers Remote Radio Unit Installation Guide

Installation Guide

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