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

RRU3908 V2V100R003Hardware Maintenance GuideIssue 01Date 2010-04-10Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.
Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. For anyassistance, please contact our local office or company headquarters. Huawei Technologies Co., Ltd.Address: Huawei Industrial BaseBantian, LonggangShenzhen 518129People's Republic of ChinaWebsite: http://www.huawei.comEmail: support@huawei.com Copyright © Huawei Technologies Co., Ltd. 2010. All rights reserved.No part of this document may be reproduced or transmitted in any form or by any means without prior writtenconsent of Huawei Technologies Co., Ltd. Trademarks and Permissions and other Huawei trademarks are the property of Huawei Technologies Co., Ltd.All other trademarks and trade names mentioned in this document are the property of their respective holders. NoticeThe purchased products, services and features are stipulated by the contract made between Huawei and thecustomer. All or part of the products, services and features described in this document may not be within thepurchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,and recommendations in this document are provided "AS IS" without warranties, guarantees or representationsof any kind, either express or implied.The information in this document is subject to change without notice. Every effort has been made in thepreparation of this document to ensure accuracy of the contents, but all statements, information, andrecommendations in this document do not constitute the warranty of any kind, express or implied.Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.
ContentsAbout This Document.....................................................................................................................11 Changes in the RRU3908 V2 Hardware Maintenance Guide............................................1-12 Maintenance Items for the RRU..............................................................................................2-13 Powering On and Powering Off the RRU.............................................................................3-13.1 Powering On the RRU.....................................................................................................................................3-23.2 Powering Off the RRU....................................................................................................................................3-34 Replacing the RRU.....................................................................................................................4-15 Replacing the Optical Module.................................................................................................5-1RRU3908 V2Hardware Maintenance Guide ContentsIssue 01 (2010-04-10) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.i
FiguresFigure 4-1 Loosening the captive screws on the main bracket............................................................................4-2Figure 4-2 Tightening the screws on the adapting piece......................................................................................4-2Figure 4-3 Lifting the bottom of the RRU...........................................................................................................4-3RRU3908 V2Hardware Maintenance Guide FiguresIssue 01 (2010-04-10) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.iii
TablesTable 2-1 Maintenance items for the RRU...........................................................................................................2-1RRU3908 V2Hardware Maintenance Guide TablesIssue 01 (2010-04-10) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.v
About This DocumentPurposeThis document describes the routine maintenance items for the RRU3908 hardware, such asequipment maintenance and power-on and power-off operations. It also describes the proceduresfor replacing components and modules.Product VersionThe following table lists the product version related to this document.Product Name Product VersionRRU3908 V2 (hereinafter referred to asRRU3908)SRAN V100R003eRAN V100R002C00 Intended AudienceThis document is intended for:lSystem engineerslSite maintainersOrganization1 Changes in the RRU3908 V2 Hardware Maintenance GuideThis chapter describes the changes in the RRU3908 V2 Hardware Maintenance Guide.2 Maintenance Items for the RRUThe maintenance items for the RRU are equipment surface, equipment cleanliness, and LEDs.3 Powering On and Powering Off the RRURRU3908 V2Hardware Maintenance Guide About This DocumentIssue 01 (2010-04-10) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.1
This describes how to power on and power off the RRU. When powering on the RRU, you shouldcheck the power supply voltage of the RRU and the status of the LEDs on the RRU. Whenpowering off the RRU, you can perform normal power-off or emergency power-off operationbased on field requirements.4 Replacing the RRUThe RRU, a remote radio unit, forms a distributed BTS with the BBU.5 Replacing the Optical ModuleThe optical module implements optical-electrical conversion, thus enabling optical transmissionbetween the RRU and other devices. You need to remove the optical cable before replacing theoptical module. Replacing the optical cable disrupts the transmission of CPRI signals.ConventionsSymbol ConventionsThe symbols that may be found in this document are defined as follows.Symbol DescriptionIndicates a hazard with a high level of risk, which if notavoided,will result in death or serious injury.Indicates a hazard with a medium or low level of risk, whichif not avoided, could result in minor or moderate injury.Indicates a potentially hazardous situation, which if notavoided,could result in equipment damage, data loss,performance degradation, or unexpected results.Indicates a tip that may help you solve a problem or savetime.Provides additional information to emphasize or supplementimportant points of the main text. General ConventionsThe general conventions that may be found in this document are defined as follows.Convention DescriptionTimes New Roman Normal paragraphs are in Times New Roman.Boldface Names of files, directories, folders, and users are inboldface. For example, log in as user root.Italic Book titles are in italics.Courier New Examples of information displayed on the screen are inCourier New.About This DocumentRRU3908 V2Hardware Maintenance Guide2 Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.Issue 01 (2010-04-10)
Command ConventionsThe command conventions that may be found in this document are defined as follows.Convention DescriptionBoldface The keywords of a command line are in boldface.Italic Command arguments are in italics.[ ] Items (keywords or arguments) in brackets [ ] are optional.{ x | y | ... } Optional items are grouped in braces and separated byvertical bars. One item is selected.[ x | y | ... ] Optional items are grouped in brackets and separated byvertical bars. One item is selected or no item is selected.{ x | y | ... }*Optional items are grouped in braces and separated byvertical bars. A minimum of one item or a maximum of allitems can be selected.[ x | y | ... ]*Optional items are grouped in brackets and separated byvertical bars. Several items or no item can be selected. GUI ConventionsThe GUI conventions that may be found in this document are defined as follows.Convention DescriptionBoldface Buttons, menus, parameters, tabs, window, and dialog titlesare in boldface. For example, click OK.>Multi-level menus are in boldface and separated by the ">"signs. For example, choose File > Create > Folder. Keyboard OperationsThe keyboard operations that may be found in this document are defined as follows.Format DescriptionKey Press the key. For example, press Enter and press Tab.Key 1+Key 2 Press the keys concurrently. For example, pressing Ctrl+Alt+A means the three keys should be pressed concurrently.Key 1, Key 2 Press the keys in turn. For example, pressing Alt, A meansthe two keys should be pressed in turn. RRU3908 V2Hardware Maintenance Guide About This DocumentIssue 01 (2010-04-10) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.3
Mouse OperationsThe mouse operations that may be found in this document are defined as follows.Action DescriptionClick Select and release the primary mouse button without movingthe pointer.Double-click Press the primary mouse button twice continuously andquickly without moving the pointer.Drag Press and hold the primary mouse button and move thepointer to a certain position.About This DocumentRRU3908 V2Hardware Maintenance Guide4 Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.Issue 01 (2010-04-10)
1 Changes in the RRU3908 V2 HardwareMaintenance GuideThis chapter describes the changes in the RRU3908 V2 Hardware Maintenance Guide.01(2010-04-10)This is the draft release.RRU3908 V2Hardware Maintenance Guide 1 Changes in the RRU3908 V2 Hardware Maintenance GuideIssue 01 (2010-04-10) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.1-1
2 Maintenance Items for the RRUThe 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 RRUItem CheckingFrequencyOperation Reference StandardEquipmentsurfaceMonthly orquarterlyCheck whether the surfaceof the equipment isdamaged and whether thelabel on the equipment islegible.None.EquipmentcleanlinessMonthly orquarterlyCheck whether theequipment is clean.The surface of theequipment is cleanLEDs Monthly orquarterlyCheck whether the LEDson the equipment arefunctional.For details on the status ofthe LEDs, see RRUIndicators.RRU3908 V2Hardware Maintenance Guide 2 Maintenance Items for the RRUIssue 01 (2010-04-10) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.2-1
3 Powering On and Powering Off the RRUAbout This ChapterThis describes how to power on and power off the RRU. When powering on the RRU, you shouldcheck the power supply voltage of the RRU and the status of the LEDs on the RRU. Whenpowering off the RRU, you can perform normal power-off or emergency power-off operationbased on field requirements.3.1 Powering On the RRUYou need to power on the RRU and check the running status of the RRU according to the statusof the LEDs.3.2 Powering Off the RRUThis describes how to power off the RRU and check the RRU status. The RRU power-off isclassified into normal power-off and emergency power-off.RRU3908 V2Hardware Maintenance Guide 3 Powering On and Powering Off the RRUIssue 01 (2010-04-10) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.3-1
3.1 Powering On the RRUYou need to power on the RRU and check the running status of the RRU according to the statusof the LEDs.PrerequisitelThe 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.ContextCAUTIONThe RRU must be powered on within 24 hours after being unpacked. If the RRU needs to bepowered off for maintenance, the duration of the power-off state cannot exceed 24 hoursProcedureStep 1 Power on the RRU.DANGERDo 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.NOTEIf 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. ----End3 Powering On and Powering Off the RRURRU3908 V2Hardware Maintenance Guide3-2 Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.Issue 01 (2010-04-10)
3.2 Powering Off the RRUThis describes how to power off the RRU and check the RRU status. The RRU power-off isclassified into normal power-off and emergency power-off.ProcedureStep 1 Choose normal power-off or emergency power-off based on different situations.If... Then...The RRU needs to be powered off in the caseof an equipment swap or a foreseeableregional blackoutGo to Step 2 to perform the normal power-off.An emergency such as an electric spark,smoke, or water immersion occurs in theRRUGo to Step 3 to perform the emergencypower-off. Step 2 Set the corresponding MCB on the auxiliary power device for the RRU to OFF.NOTEIf RRU modules are cascaded, take the impact on the lower-level RRU module into consideration whenyou 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, setthe corresponding MCB on the device to OFF.----EndRRU3908 V2Hardware Maintenance Guide 3 Powering On and Powering Off the RRUIssue 01 (2010-04-10) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.3-3
4 Replacing the RRUThe RRU, a remote radio unit, forms a distributed BTS with the BBU.PrerequisitelThe 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.ProcedureStep 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.WARNINGTake proper ESD protection measures, for example, wear an ESD wrist strap or a pair of ESDgloves, 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 M4screwdriver, 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 M4screwdriver, as shown in Figure 4-1.RRU3908 V2Hardware Maintenance Guide 4 Replacing the RRUIssue 01 (2010-04-10) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.4-1
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 inFigure 4-2. Using the screw only for removing the RRU, loosen the connection between theadapting 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 RRURRU3908 V2Hardware Maintenance Guide4-2 Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.Issue 01 (2010-04-10)
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 tighteningtorque 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 inthe 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 protectingthe 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. Fordetails about the LEDs, see RRU Indicators.Step 14 Take off the ESD wrist strap or gloves, and then pack up all the tools.----EndPostrequisitelPlace the replaced RRU into the ESD box or bag. Then, place the ESD box or bag into acarton 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.RRU3908 V2Hardware Maintenance Guide 4 Replacing the RRUIssue 01 (2010-04-10) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.4-3
5 Replacing the Optical ModuleThe optical module implements optical-electrical conversion, thus enabling optical transmissionbetween the RRU and other devices. You need to remove the optical cable before replacing theoptical module. Replacing the optical cable disrupts the transmission of CPRI signals.PrerequisitelThe types and quantity of faulty optical modules are confirmed, and new optical modulesare ready.lThe tools and materials, such as an ESD wrist strap or ESD gloves, ESD box or bag, M4screwdriver, and wrench are ready.ContextlThe 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 involvesdisconnecting the optical cables, removing the faulty optical module, inserting a new opticalmodule, reconnecting the optical cables, and waiting for the CPRI links to resume.ProcedureStep 1 Wear an ESD wrist strap or a pair of ESD gloves.WARNINGTake proper ESD protection measures, for example, wear an ESD wrist strap or a pair of ESDgloves, 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 M4screwdriver, 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.RRU3908 V2Hardware Maintenance Guide 5 Replacing the Optical ModuleIssue 01 (2010-04-10) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.5-1
WARNINGDo not look into the optical fiber with unprotected eyes after the optical cable is removed fromthe optical fiber.Step 5 Turn the puller of the optical module outwards, and then pull the puller until the optical moduleis 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 CPRIlinks 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 ofthe RRU, and then tighten the protection screw on the cover plate for the cabling cavity of theRRU 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.----EndPostrequisitelPlace the replaced optical module into the ESD box or bag. Then, place the ESD box orbag 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 ModuleRRU3908 V2Hardware Maintenance Guide5-2 Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.Issue 01 (2010-04-10)

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