Huawei Technologies RRU3908 Remote Radio Unit of Multi-Mode Distributed Base Station User Manual Hardware Maintenance Guide

Huawei Technologies Co.,Ltd Remote Radio Unit of Multi-Mode Distributed Base Station Hardware Maintenance Guide

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Maintenance Guide

RRU3908 V2

V100R003

Hardware Maintenance Guide

Issue 01

Date 2010-04-10

Huawei Proprietary and Confidential

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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

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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

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Huawei Proprietary and Confidential

Contents

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

1 Changes in the RRU3908 V2 Hardware Maintenance Guide............................................1-1

2 Maintenance Items for the RRU..............................................................................................2-1

3 Powering On and Powering Off the RRU.............................................................................3-1

3.1 Powering On the RRU.....................................................................................................................................3-2

3.2 Powering Off the RRU....................................................................................................................................3-3

4 Replacing the RRU.....................................................................................................................4-1

5 Replacing the Optical Module.................................................................................................5-1

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Figures

Figure 4-1 Loosening the captive screws on the main bracket............................................................................4-2

Figure 4-2 Tightening the screws on the adapting piece......................................................................................4-2

Figure 4-3 Lifting the bottom of the RRU...........................................................................................................4-3

RRU3908 V2

Hardware Maintenance Guide Figures

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iii

Tables

Table 2-1 Maintenance items for the RRU...........................................................................................................2-1

RRU3908 V2

Hardware Maintenance Guide Tables

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About This Document

Purpose

This document describes the routine maintenance items for the RRU3908 hardware, such as

equipment maintenance and power-on and power-off operations. It also describes the procedures

for replacing components and modules.

Product Version

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

Product Name Product Version

RRU3908 V2 (hereinafter referred to as

RRU3908)

SRAN V100R003

eRAN V100R002C00

Intended Audience

This document is intended for:

lSystem engineers

lSite maintainers

Organization

1 Changes in the RRU3908 V2 Hardware Maintenance Guide

This chapter describes the changes in the RRU3908 V2 Hardware Maintenance Guide.

2 Maintenance Items for the RRU

The maintenance items for the RRU are equipment surface, equipment cleanliness, and LEDs.

3 Powering On and Powering Off the RRU

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This describes how to power on and power off the RRU. When powering on the RRU, you should

check the power supply voltage of the RRU and the status of the LEDs on the RRU. When

powering off the RRU, you can perform normal power-off or emergency power-off operation

based on field requirements.

4 Replacing the RRU

The RRU, a remote radio unit, forms a distributed BTS with the BBU.

5 Replacing the Optical Module

The optical module implements optical-electrical conversion, thus enabling optical transmission

between the RRU and other devices. You need to remove the optical cable before replacing the

optical module. Replacing the optical cable disrupts the transmission of CPRI signals.

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.

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.

About This Document

RRU3908 V2

Hardware Maintenance Guide

2 Huawei Proprietary and Confidential

Issue 01 (2010-04-10)

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.

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.

RRU3908 V2

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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.

About This Document

RRU3908 V2

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4 Huawei Proprietary and Confidential

Issue 01 (2010-04-10)

1 Changes in the RRU3908 V2 Hardware

Maintenance Guide

This chapter describes the changes in the RRU3908 V2 Hardware Maintenance Guide.

01(2010-04-10)

This is the draft release.

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1-1

2 Maintenance Items for the RRU

The maintenance items for the RRU are equipment surface, equipment cleanliness, and LEDs.

Table 2-1 describes the maintenance items for the RRU.

Table 2-1 Maintenance items for the RRU

Item Checking

Frequency

Operation Reference Standard

Equipment

surface

Monthly or

quarterly

Check whether the surface

of the equipment is

damaged and whether the

label on the equipment is

legible.

None.

Equipment

cleanliness

Monthly or

quarterly

Check whether the

equipment is clean.

The surface of the

equipment is clean

LEDs Monthly or

quarterly

Check whether the LEDs

on the equipment are

functional.

For details on the status of

the LEDs, see RRU

Indicators.

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3 Powering On and Powering Off the RRU

About This Chapter

This describes how to power on and power off the RRU. When powering on the RRU, you should

check the power supply voltage of the RRU and the status of the LEDs on the RRU. When

powering off the RRU, you can perform normal power-off or emergency power-off operation

based on field requirements.

3.1 Powering On the RRU

You need to power on the RRU and check the running status of the RRU according to the status

of the LEDs.

3.2 Powering Off the RRU

This describes how to power off the RRU and check the RRU status. The RRU power-off is

classified into normal power-off and emergency power-off.

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3-1

3.1 Powering On the RRU

You need to power on the RRU and check the running status of the RRU according to the status

of the LEDs.

Prerequisite

lThe hardware and cables of the RRU are installed.

lIf DC power is used, the input voltage ranges from -36 V DC to -57 V DC.

lIf AC power is used, the input voltage ranges from 100 V AC to 240 V AC.

Context

CAUTION

The RRU must be powered on within 24 hours after being unpacked. If the RRU needs to be

powered off for maintenance, the duration of the power-off state cannot exceed 24 hours

Procedure

Step 1 Power on the RRU.

DANGER

Do not look into the optical module after the RRU is powered on.

Step 2 Wait for three to five minutes, and then check the status of the LEDs on the RRU. For details,

see RRU Indicators.

NOTE

If RRUs are connected in cascading mode, check the status of the LEDs on each RRU.

Step 3 Take corresponding actions according to the status of the LEDs.

If ... Then ...

The RRU works properly End the power-on operation.

The RRU is faulty Rectify the fault, and then go to Step 1.

----End

3 Powering On and Powering Off the RRU

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3.2 Powering Off the RRU

This describes how to power off the RRU and check the RRU status. The RRU power-off is

classified into normal power-off and emergency power-off.

Procedure

Step 1 Choose normal power-off or emergency power-off based on different situations.

If... Then...

The RRU needs to be powered off in the case

of an equipment swap or a foreseeable

regional blackout

Go to Step 2 to perform the normal power-

off.

An emergency such as an electric spark,

smoke, or water immersion occurs in the

RRU

Go to Step 3 to perform the emergency

power-off.

Step 2 Set the corresponding MCB on the auxiliary power device for the RRU to OFF.

NOTE

If RRU modules are cascaded, take the impact on the lower-level RRU module into consideration when

you power off an RRU module, so as to avoid disrupting ongoing services.

Step 3 Cut off the external input power of the auxiliary power device for the RRU. If time permits, set

the corresponding MCB on the device to OFF.

----End

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4 Replacing the RRU

The RRU, a remote radio unit, forms a distributed BTS with the BBU.

Prerequisite

lThe tools and materials, such as an ESD wrist strap, M4 screwdriver, M6 screwdriver,

wrench, waterproof tape, and insulating tape are ready.

lThe quantity of faulty RRUs are confirmed, and new RRUs are ready.

Procedure

Step 1 Power off the RRU. For details, see 3.2 Powering Off the RRU.

Step 2 Wear an ESD wrist strap or a pair of ESD gloves.

WARNING

Take proper ESD protection measures, for example, wear an ESD wrist strap or a pair of ESD

gloves, to prevent electrostatic damage to the boards, modules, or electronic components.

Step 3 Loosen the screw for protecting the cabling cavity on the cover plate by using the M4

screwdriver, and then open the cabling cavity of the RRU by lifting the handle on the cover plate.

Step 4 Record all the cable connections on the panel of the board to be replaced.

Step 5 Disconnect the cables from the ports in the cabling cavity and on the bottom panel.

Step 6 Loosen the captive screws on the two contact pieces of the main bracket by using the M4

screwdriver, as shown in Figure 4-1.

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Figure 4-1 Loosening the captive screws on the main bracket

Step 7 Use an M6 screwdriver to tighten the screw on the adapting piece of the RRU, as shown in

Figure 4-2. Using the screw only for removing the RRU, loosen the connection between the

adapting piece and the main bracket, and then lift the bottom of the RRU to remove the RRU,

as shown in Figure 4-3.

Figure 4-2 Tightening the screws on the adapting piece

4 Replacing the RRU

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Figure 4-3 Lifting the bottom of the RRU

Step 8 Tighten the captive screws on the two contact pieces of the main bracket until the tightening

torque reaches 1.4 N·m.

Step 9 Install a new RRU, and then waterproof the RRU.

Step 10 Insert all the cables to be connected to the RRU, and then check that the idle cables trough in

the cabling cavity are fitted with waterproof fillers.

Step 11 Close the cover plate of the cabling cavity of the RRU, and then tighten the screw for protecting

the cabling cavity on the cover plate until the tightening torque reaches 1.4 N·m.

Step 12 Power on the RRU. For details, see 3.1 Powering On the RRU.

Step 13 Check whether the new RRU is functional according to the status of the LEDs on the RRU. For

details about the LEDs, see RRU Indicators.

Step 14 Take off the ESD wrist strap or gloves, and then pack up all the tools.

----End

Postrequisite

lPlace the replaced RRU into the ESD box or bag. Then, place the ESD box or bag into a

carton padded with foam or into the packing box of the new RRU.

lFill in the fault form with the details of the replaced component.

lContact the local Huawei office to handle the faulty component.

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5 Replacing the Optical Module

The optical module implements optical-electrical conversion, thus enabling optical transmission

between the RRU and other devices. You need to remove the optical cable before replacing the

optical module. Replacing the optical cable disrupts the transmission of CPRI signals.

Prerequisite

lThe types and quantity of faulty optical modules are confirmed, and new optical modules

are ready.

lThe tools and materials, such as an ESD wrist strap or ESD gloves, ESD box or bag, M4

screwdriver, and wrench are ready.

Context

lThe optical modules are installed on the CPRI0 and CPRI1 ports of the RRU.

lThe optical module is hot-swappable.

lIt takes about five minutes to replace the optical module of the RRU, which involves

disconnecting the optical cables, removing the faulty optical module, inserting a new optical

module, reconnecting the optical cables, and waiting for the CPRI links to resume.

Procedure

Step 1 Wear an ESD wrist strap or a pair of ESD gloves.

WARNING

Take proper ESD protection measures, for example, wear an ESD wrist strap or a pair of ESD

gloves, to prevent electrostatic damage to the boards, modules, or electronic components.

Step 2 Loosen the screw for protecting the cabling cavity on the cover plate by using the M4

screwdriver, and then open the cabling cavity of the RRU by lifting the handle on the cover plate.

Step 3 Record the connections of the optical modules and optical cables.

Step 4 Remove the DB15 connector from the alarm cable, press down the latch on the optical connector,

and then remove the connector from the faulty optical module.

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WARNING

Do not look into the optical fiber with unprotected eyes after the optical cable is removed from

the optical fiber.

Step 5 Turn the puller of the optical module outwards, and then pull the puller until the optical module

is removed from the RRU.

Step 6 Install the new optical module onto the RRU.

Step 7 Insert the optical connector into the new optical module.

Step 8 According to the status of the LEDs on the CPRI0 and CPRI1 ports, determine whether the CPRI

links resume. For details about the LEDs, see RRU Indicators.

Step 9 Reinstall the DB15 connector on the alarm cable, close the cover plate for the cabling cavity of

the RRU, and then tighten the protection screw on the cover plate for the cabling cavity of the

RRU until the tightening torque reaches 1.4 N·m.

Step 10 Take off the ESD wrist strap or gloves, and then pack up all the tools.

----End

Postrequisite

lPlace the replaced optical module into the ESD box or bag. Then, place the ESD box or

bag into a carton padded with foam or into the packing box of the new module.

lFill in the fault form with the details of the replaced component.

lContact the local Huawei office to handle the faulty optical module.

5 Replacing the Optical Module

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Huawei Technologies RRU3908 Remote Radio Unit of Multi-Mode Distributed Base Station User Manual Hardware Maintenance Guide

Huawei Technologies Co.,Ltd Remote Radio Unit of Multi-Mode Distributed Base Station Hardware Maintenance Guide

Maintenance Guide

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