Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. For any
assistance, please contact our local office or company headquarters.
Huawei Technologies Co., Ltd.
Address:Huawei Industrial Base
Bantian, Longgang
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consent of Huawei Technologies Co., Ltd.
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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.
Notice
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 the statements, information, and
recommendations in this document do not constitute a warranty of any kind, express or implied.
1.6 Working at Heights.........................................................................................................................................1-9
2.1.1 Appearance of the RRU.........................................................................................................................2-2
2.1.2 LEDs on the RRU..................................................................................................................................2-3
2.1.3 Panels of the RRU..................................................................................................................................2-4
2.2.1 Appearance of the SRXU.......................................................................................................................2-7
2.2.2 LEDs on the SRXU................................................................................................................................2-7
2.2.3 Panels of the SRXU................................................................................................................................2-8
2.4.6 RF Jumper of the RRU/SRXU.............................................................................................................2-24
User Guide
3 Installing RRU and SRXU Hardware.....................................................................................3-1
3.1 Information About the Installation..................................................................................................................3-3
3.1.1 Installation Modes of the RRU and SRXU............................................................................................3-3
3.1.2 Space Requirements of the RRU and SRXU.........................................................................................3-7
3.1.3 Cabling Specifications for the NodeB..................................................................................................3-11
3.1.4 Requirements for the RRU Cabling on a Tower..................................................................................3-13
3.1.5 Connections of RRU and SRXU Cables..............................................................................................3-19
3.1.6 Labels for DBS3836 Cables.................................................................................................................3-23
3.2 Procedure for Installing the RRU and SRXU...............................................................................................3-26
3.3 Preparing for the NodeB Installation............................................................................................................3-27
3.3.1 Unpacking Inspection for the NodeB...................................................................................................3-27
3.3.2 Tools and Instruments for NodeB Installation.....................................................................................3-29
3.4 Installing the RRU on the Ground or Rooftop..............................................................................................3-30
3.4.1 Installing a Single RRU........................................................................................................................3-30
3.4.2 Install Two RRUs.................................................................................................................................3-42
3.4.3 Install Three RRUs...............................................................................................................................3-57
3.5 Installing the RRU on the Tower..................................................................................................................3-75
3.5.1 Assembling the Parts of the RRU........................................................................................................3-75
3.5.2 Lifting the Assembled RRU.................................................................................................................3-79
3.5.3 Installing the Assembled RRU on the Tower.......................................................................................3-80
3.6 Installing the SRXU......................................................................................................................................3-83
3.6.1 Installing the SRXU on a Single RRU.................................................................................................3-84
3.6.2 Installing the SRXUs on the Two RRUs..............................................................................................3-87
3.6.3 Installing the SRXUs on the Three RRUs............................................................................................3-94
3.7 Installing RRU and SRXU Cables................................................................................................................3-97
3.7.1 Installing the PGND Cable of the RRU/SRXU...................................................................................3-98
3.7.2 Installing the -48 V DC Power Cable of the RRU/SRXU.................................................................3-100
3.7.3 Installing the RF Jumper of the RRU/SRXU.....................................................................................3-106
3.7.4 Installing the CPRI Optical Cable of the RRU/SRXU.......................................................................3-108
3.7.5 Installing the Alarm Cable of the RRU..............................................................................................3-112
3.7.6 Installing the AISG Multi-Wire Cable of the RRU/SRXU................................................................3-113
3.7.7 Installing the AISG Extension Cable of the RRU/SRXU..................................................................3-114
3.7.8 Opening and Closing the Cover Plate of the RRU Cabling Cavity...................................................3-114
3.7.9 Opening and Closing the Cover Plate of the SRXU Cabling Cavity.................................................3-114
3.8 Powering On the RRU/SRXU.....................................................................................................................3-114
3.9 Installing the Housing of the RRU and SRXU...........................................................................................3-116
3.10 Checklists for Hardware Installation of Distributed NodeBs and Mini NodeBs......................................3-117
4 Maintaining RRU and SRXU Hardware................................................................................4-1
4.1 Equipment Maintenance Items for the RRU/SRXU.......................................................................................4-2
4.2 Powering On/Off the RRU/SRXU..................................................................................................................4-2
4.2.1 Powering On the RRU/SRXU................................................................................................................4-2
4.2.2 Powering Off the RRU/SRXU...............................................................................................................4-4
4.3 Replacing an RRU...........................................................................................................................................4-4
4.4 Replacing an SRXU........................................................................................................................................4-6
4.5 Replacing an Optical Module..........................................................................................................................4-8
Figure 1-1 Wearing an ESD wrist strap...............................................................................................................1-5
Figure 1-2 Lifting a weight................................................................................................................................1-10
Figure 2-2 Panels of the RRU..............................................................................................................................2-5
Figure 2-4 Panels of the SRXU............................................................................................................................2-9
Figure 2-7 –48 V DC power cable.....................................................................................................................2-12
Figure 2-16 DC power cable..............................................................................................................................2-20
Figure 3-14 Installing the cable clip...................................................................................................................3-16
Figure 3-15 Routing the cables in the cable rack...............................................................................................3-17
Figure 3-16 Installing the cable clip on the tower..............................................................................................3-18
Figure 3-17 Routing the cables in the cable rack...............................................................................................3-19
Figure 3-18 Cable connections of one RRU without the SRXU........................................................................3-20
Figure 3-19 Cable connections of one RRU with the SRXU.............................................................................3-21
Figure 3-20 Cable connections of multiple RRUs without the SRXUs.............................................................3-22
Figure 3-21 Cable connections of multiple RRUs with the SRXUs..................................................................3-22
Figure 3-22 Label for the BBU power cable (unit: mm)....................................................................................3-23
Figure 3-23 Label for the RRU power cable (unit: mm)....................................................................................3-23
Figure 3-24 Label for the E1 cable (unit: mm)...................................................................................................3-24
Figure 3-25 Label for the CPRI optical cable (unit: mm)..................................................................................3-24
Figure 3-26 Label for the RRU alarm cable (unit: mm).....................................................................................3-25
Figure 3-27 Label for the BBU alarm cable (unit: mm).....................................................................................3-25
Figure 3-28 Leading cable ties through the holes..............................................................................................3-25
Figure 3-29 Binding the label to the cable.........................................................................................................3-26
Figure 3-30 Mounting the upper fixture assembly.............................................................................................3-31
Figure 3-31 Holes in the fixture assembly.........................................................................................................3-31
Figure 3-32 Measuring L1 and L2.....................................................................................................................3-32
Figure 3-33 Holes in the multi-purpose attachment plate..................................................................................3-32
Figure 3-34 Securing the multi-purpose attachment plate to the mounting plate..............................................3-33
Figure 3-35 Installing the third pole fixture.......................................................................................................3-33
Figure 3-36 Installing the mounting plate..........................................................................................................3-34
Figure 3-37 Mounting the lower fixture assembly.............................................................................................3-35
Figure 3-38 Installed expansion bolt assemblies and the RRU..........................................................................3-36
Figure 3-39 Determining the anchor points.......................................................................................................3-36
Figure 3-40 Drilling a hole and installing the expansion bolt assembly............................................................3-37
Figure 3-41 Securing the mounting plate...........................................................................................................3-38
Figure 3-42 Filling tube, insulating washer, and insulating block.....................................................................3-38
Figure 3-43 One RRU in ordinary mode and the other in reverse mode...........................................................3-39
Figure 3-44 Securing the attachment plate.........................................................................................................3-40
Figure 3-45 Installing the module......................................................................................................................3-41
Figure 3-46 Securing the module.......................................................................................................................3-42
Figure 3-47 Top view of the two modules using the side-mounted installation method...................................3-43
Figure 3-48 Top view of the two modules using the rear-mounted installation method...................................3-44
Figure 3-49 Holes in the multi-purpose attachment plate..................................................................................3-44
Figure 3-50 Securing the multi-purpose attachment plate to the bottom of the second mounting plate............3-44
Figure 3-51 Installing the second mounting plate..............................................................................................3-45
Figure 3-52 Securing the second mounting plate to the first one.......................................................................3-46
Figure 3-53 Installing the second mounting plate..............................................................................................3-47
Figure 3-54 Securing the second mounting plate...............................................................................................3-47
Figure 3-55 Holes in the multi-purpose attachment plate..................................................................................3-48
Figure 3-56 Securing the multi-purpose attachment plate to the bottom of the second mounting plate............3-48
Figure 3-57 Installing the second mounting plate..............................................................................................3-49
Figure 3-58 Securing the second mounting plate to the first one.......................................................................3-50
Figure 3-59 Removing the plastic housing.........................................................................................................3-51
Figure 3-60 Installing the module in reverse mode in the housing....................................................................3-52
Figure 3-61 Securing the attachment plate to the module that is in reverse mode.............................................3-52
Figure 3-62 Installing the first module...............................................................................................................3-53
Figure 3-63 Securing the first module................................................................................................................3-54
Figure 3-64 Securing the attachment plate to the module that is in ordinary mode...........................................3-55
Figure 3-65 Installing the second module..........................................................................................................3-55
Figure 3-66 Securing the second module...........................................................................................................3-56
Figure 3-67 Rear-mounted RRUs with the cabling cavities on the same side...................................................3-57
Figure 3-68 Top view of the three modules using the side-mounted installation method.................................3-58
Figure 3-69 Top view of the three modules using the hybrid installation method.............................................3-59
Figure 3-70 Holes in the multi-purpose attachment plate..................................................................................3-59
Figure 3-71 Securing the multi-purpose attachment plate to the bottom of the second mounting plate............3-60
Figure 3-72 Installing the second mounting plate..............................................................................................3-60
Figure 3-73 Securing the second mounting plate to the first one.......................................................................3-61
Figure 3-74 Installing the third mounting plate..................................................................................................3-62
Figure 3-75 Securing the third mounting plate to the first one..........................................................................3-63
Figure 3-76 Holes in the multi-purpose attachment plate..................................................................................3-63
Figure 3-77 Securing the multi-purpose attachment plate to the bottom of the second mounting plate............3-64
Figure 3-78 Installing the second mounting plate..............................................................................................3-64
Figure 3-79 Securing the second mounting plate to the first one.......................................................................3-65
Figure 3-80 Installing the third mounting plate..................................................................................................3-66
Figure 3-81 Securing the second mounting plate to the first one.......................................................................3-67
Figure 3-82 Securing the attachment plate to the first module..........................................................................3-68
Figure 3-83 Installing the first module...............................................................................................................3-69
Figure 3-84 Securing the first module................................................................................................................3-70
Figure 3-85 Removing the plastic housing.........................................................................................................3-70
Figure 3-86 Installing the module in reverse mode in the housing....................................................................3-71
Figure 3-87 Securing the attachment plate to the module that is in reverse mode.............................................3-71
Figure 3-88 Installing the second module..........................................................................................................3-72
Figure 3-89 Securing the second module...........................................................................................................3-73
Figure 3-90 Installing the third module..............................................................................................................3-74
Figure 3-91 Securing the third module...............................................................................................................3-75
Figure 3-92 Holes in the multi-purpose attachment plate..................................................................................3-76
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Figure 3-93 Securing the multi-purpose attachment plate.................................................................................3-76
Figure 3-94 Installing a pole fixture...................................................................................................................3-77
Figure 3-95 Securing the attachment plate.........................................................................................................3-77
Figure 3-96 Assembling the module and mounting plate..................................................................................3-78
Figure 3-97 Securing the module and mounting plate.......................................................................................3-79
Figure 3-98 Assembled RRU tied with the rope................................................................................................3-79
Figure 3-99 Mounting the upper fixture assembly.............................................................................................3-80
Figure 3-100 Holes in the fixture assembly.......................................................................................................3-81
Figure 3-101 Measuring L1 and L2...................................................................................................................3-81
Figure 3-102 Installing the assembled RRU......................................................................................................3-82
Figure 3-103 Mounting the lower fixture assembly...........................................................................................3-83
Figure 3-104 SRXU installed on the single RRU..............................................................................................3-84
Figure 3-105 Remove the plastic housing..........................................................................................................3-85
Figure 3-106 Securing the connecting boards....................................................................................................3-85
Figure 3-107 Securing the attachment plate to the SRXU.................................................................................3-86
Figure 3-108 Installing the SRXU......................................................................................................................3-86
Figure 3-109 Securing the SRXU......................................................................................................................3-87
Figure 3-110 SRXUs installed on the two RRUs...............................................................................................3-88
Figure 3-111 Remove the plastic housings........................................................................................................3-89
Figure 3-112 Securing the connecting boards to the RRU module that is in ordinary mode.............................3-90
Figure 3-113 Securing the attachment plate to one SRXU................................................................................3-90
Figure 3-114 Installing the SRXU......................................................................................................................3-91
Figure 3-115 Securing the SRXU......................................................................................................................3-92
Figure 3-116 Remove the plastic housings........................................................................................................3-93
Figure 3-117 SRXUs installed on the two rear-mounted RRUs........................................................................3-93
Figure 3-118 SRXUs installed on the three RRUs.............................................................................................3-94
Figure 3-119 Remove the plastic housings........................................................................................................3-95
Figure 3-120 Securing the connecting boards....................................................................................................3-96
Figure 3-121 Installing the third SRXU.............................................................................................................3-96
Figure 3-122 Securing the third SRXU..............................................................................................................3-97
Figure 3-123 Connecting the PGND cable (1)...................................................................................................3-98
Figure 3-124 Connecting the OT terminal.........................................................................................................3-99
Figure 3-125 Connecting the PGND cable (2)...................................................................................................3-99
Figure 3-126 Cable trough for the PGND cable of the SRXU.........................................................................3-100
Figure 3-127 Power cable with two OT terminals...........................................................................................3-101
Figure 3-128 Determining lengths of power cable for different operation......................................................3-101
Figure 3-129 Stripping the cable......................................................................................................................3-102
Figure 3-130 Two OT terminals on the power cable.......................................................................................3-102
Figure 3-131 Removing the jacket from the power cable................................................................................3-103
Figure 3-132 Cable troughs in the cabling cavity............................................................................................3-103
Figure 3-133 Opening the cover.......................................................................................................................3-104
Figure 3-134 Shielding layer pressed by the strap...........................................................................................3-104
Figure 3-138 CPRI_W port in the RRU cabling cavity...................................................................................3-109
Figure 3-139 Strap and waterproof filler..........................................................................................................3-110
Figure 3-140 CPRI_W port in the SRXU cabling cavity.................................................................................3-111
Figure 3-141 Cable trough for the optical cable in the SRXU cabling cavity.................................................3-112
Figure 3-142 Cable troughs in the cabling cavity............................................................................................3-113
Figure 3-143 Installing the housing..................................................................................................................3-116
Figure 3-144 Securing the housing..................................................................................................................3-117
Figure 4-1 Removing the screws at the bottom of the mounting plate................................................................ 4-5
Figure 4-2 Removing the screws at the bottom of the SRXU..............................................................................4-7
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Table 2-1 LEDs on the RRU................................................................................................................................ 2-3
Table 2-2 Ports and LEDs on the panels of the RRU...........................................................................................2-6
Table 2-3 LEDs on the SRXU..............................................................................................................................2-7
Table 2-4 Ports and LEDs on the panels of the SRXU......................................................................................2-10
Table 2-5 Pin assignment for the wires of the –48 V DC power cable (North American Standard).................2-12
Table 2-6 Pin assignment for the wires of the –48 V DC power cable (European Standard)............................2-12
Table 2-7 Pin assignment for the fiber tails of the CPRI optical cable..............................................................2-13
Table 2-8 Installation positions of the CPRI optical cable.................................................................................2-13
Table 2-9 Pin assignment for the wires of the AISG multi-wire cable..............................................................2-14
Table 2-10 Pin assignment for the wires of the AISG extension cable..............................................................2-15
Table 2-11 RF jumper connections of the RRU.................................................................................................2-17
Table 2-12 Pin assignment for the wires of the alarm cable...............................................................................2-19
Table 2-13 Pin assignment for the wires of the DC power cable.......................................................................2-21
Table 2-14 Pin assignment for the wires of the AISG multi-wire cable............................................................2-22
Table 2-15 Pin assignment for the wires of the AISG extension cable..............................................................2-23
Table 2-16 Pin assignment for the fiber tails of the CPRI optical cable............................................................2-24
Table 2-17 Installation positions of the CPRI optical cable...............................................................................2-24
Table 2-18 RF jumper connections of the RRU.................................................................................................2-25
Table 3-1 Tools and instruments........................................................................................................................3-29
Table 3-2 Connecting the antenna jumper to the appropriate RF port.............................................................3-106
Table 3-3 LEDs on the RRU............................................................................................................................3-115
Table 3-4 LEDs on the SRXU..........................................................................................................................3-115
Table 3-5 Checklist for NodeB installation......................................................................................................3-117
Table 3-6 Checklist for cable connections.......................................................................................................3-118
Table 3-7 Checklist for power cable connections.............................................................................................3-119
Table 3-8 Checklist for PGND cable connections............................................................................................3-119
Table 3-9 Checklist for signal cable connections.............................................................................................3-120
Table 4-1 Equipment maintenance items for the RRU/SRXU.............................................................................4-2
Table 4-2 LEDs on the RRU................................................................................................................................ 4-3
Table 4-3 LEDs on the SRXU..............................................................................................................................4-3
Issue 01 (2008-04-18)Huawei Proprietary and Confidential
This document describes the RRU hardware and provides instructions in hardware installation,
cable connections, hardware installation check, and hardware maintenance. This document is
applicable to RRU3804 and RRU3801E.
Product Versions
The following table lists the product versions related to this document.
Product Name
RRUV100R009
Intended Audience
This document is intended for:
lNodeB installers
lSystem engineers
lSite maintenance engineers
Change History
For changes in the document, refer to Changes in RRU User Guide.
Product Version
V100R010
V200R001
Organization
1 Safety Information
2 RRU and SRXU Hardware
This describes the RRU equipment, SRXU equipment, and related cables.
3 Installing RRU and SRXU Hardware
Issue 01 (2008-04-18)Huawei Proprietary and Confidential
This section describes certain safety precautions and helps to choose the measurement device
and testing device. Read and follow these safety precautions before installing, operating, and
maintaining Huawei devices.
Following All Safety Precautions
Before any operation, read the instructions and precautions in this document carefully to
minimize the possibility of accidents.
The Danger, Caution, and Note items in the package of documents do not cover all the safety
precautions that must be followed. They only provide the generic safety precautions for
operations.
Symbols
DANGER
This symbol indicates that casualty or serious accident may occur if you ignore the safety
instruction.
CAUTION
This symbol indicates that serious or major injury may occur if you ignore the safety instruction.
NOTE
This symbol indicates that the operation may be easier if you pay attention to the safety instruction.
Issue 01 (2008-04-18)Huawei Proprietary and Confidential
When operating the device, comply with the local safety regulations. The safety precautions
provided in the documents are supplementary. You must comply with the local safety
regulations.
General Installation Requirements
The personnel in charge of installation and maintenance must be trained and master the correct
operating methods and safety precautions before beginning work.
The rules for installing and maintaining the device are as follows:
lOnly the trained and qualified personnel can install, operate and maintain the device.
lOnly the qualified specialists are allowed to remove the safety facilities, and repair the
device.
lAny replacement of the device or part of the device (including the software) or any change
made to the device must be performed by qualified or authorized personnel of Huawei.
lAny fault or error that might cause safety problems must be reported immediately to the
personnel in charge.
RRU
User Guide
Grounding Requirements
The following requirements are applicable to the device to be grounded:
lGround the device before installation and remove the ground cable after uninstallation.
lDo not operate the device in the absence of a ground conductor. Do not damage the ground
conductor.
lThe unit (or system) must be permanently connected to the protection ground before
operation. Check the electrical connection of the device before operation and ensure that
the device is reliably grounded.
Safety of Personnel
Ensure the following:
lWhen lightning strikes, do not operate the device and cables.
lWhen lightning strikes, unplug the AC power connector. Do not use the fixed terminal or
touch the terminal or antenna connector.
NOTE
The previous two requirements are suitable for the wireless fixed terminal.
lTo prevent electric shock, do not connect safety extra-low voltage (SELV) circuits to
telecommunication network voltage (TNV) circuits.
lTo prevent laser radiation from injuring your eyes, never look into the optical fiber outlet
with unaided eyes.
lTo prevent electric shock and burns, wear the electrostatic discharge (ESD) clothing, gloves
and wrist strap, and remove conductors such as jewelry and watch before operation.
If the "high electrical leakage" flag is stuck to the power terminal of the device, you must ground
the device before powering it on.
CAUTION
Do not install and remove the power cable with a live line. Transient contact between the core
of the power cable and the conductor may generate electric arc or spark, which may cause fire
or eye injury.
lBefore installing or removing the power cable, turn off the power switch.
lBefore connecting the power cable, ensure that the power cable and label comply with the
requirements of the actual installation.
CAUTION
To ensure that the system runs safely, when a fuse blows, replace it with a fuse of the same type
and specifications.
Electrostatic Discharge
CAUTION
The static electricity generated by the human body may damage the electrostatic sensitive
components on the circuit board, such as the large-scale integrated circuit (LIC).
In the following situations, the human body generates a static electromagnetic field:
lMovement of body parts
lClothes friction
lFriction between shoes and the ground
lHolding plastic in hand
The static electromagnetic field will remain within the human body for a long time.
Before contacting the device, plug boards, circuit boards, and application specific integrated
circuits (ASICs), wear a grounded ESD wrist strap. It can prevent the sensitive components from
being damaged by the static electricity in the human body.
Do not place the device in the environment that has inflammable and explosive air or fog. Do
not perform any operation in this environment.
Any operation of the electrical device in the inflammable environment causes danger.
DANGER
Before handling the storage battery, read the safety precautions for the handling and connection
of the storage battery.
Incorrect operation of storage batteries may cause danger. During operation, ensure the
following:
lPrevent any short-circuit.
lPrevent the electrolyte from overflowing and leakage.
Electrolyte overflow may damage the device. It will corrode the metal parts and the circuit
boards, and ultimately damage the device and cause short-circuit of the circuit boards.
Issue 01 (2008-04-18)Huawei Proprietary and Confidential
Before installing and maintaining the storage battery, ensure the following:
lUse special insulation tools.
lUse eye protection devices and operate with care.
lWear rubber gloves and an apron in case of an electrolyte overflow.
lAlways keep the battery upright when moving. Do not place the battery upside down or tilt
it.
Short-Circuit
Short-circuit of the battery may cause injury. Although the voltage of a battery is low, high
transient current generated by short-circuit will release a surge of power.
RRU
User Guide
DANGER
Keep metal objects away from the battery to prevent short circuit. If they have to be used,
disconnect the battery in use before performing any other operation.
Harmful Gas
l Do not use unsealed lead-acid storage batteries, because the gas emitted from it may result
in fire or device corrosion.
l Lay the storage battery horizontally and fix it properly.
The lead-acid storage battery in use will emit flammable gas. Therefore, store it in a place with
good ventilation and take precautions against fire.
High Temperature
CAUTION
CAUTION
High temperature may result in distortion, damage, and electrolyte overflow of the battery.
When the temperature of the battery exceeds 60oC, check whether there is acid overflow. If acid
overflow occurs, handle the acid immediately.
If the acid overflows, it should be absorbed and neutralized immediately.
When handling a leaky battery, protect against the possible damage caused by the acid. Use the
following materials to absorb and neutralize acid spills:
lSodium bicarbonate (baking soda): NaHCO
lSodium carbonate (soda): Na
Antacids must be used according to the instructions provided by the battery manufacturer.
Lithium Battery
There is danger of explosion if the battery is incorrectly replaced.
lReplace the lithium battery with the same or equivalent type recommended by the
lDispose of the used battery according to the instructions provided by the manufacturer.
lDo not dispose of the lithium battery in fire.
1.5 Radiation
3
2CO3
CAUTION
manufacturer.
Electromagnetic Field Exposure
CAUTION
High power radio-frequency signals are harmful to human body.
Before installing or maintaining an antenna on a steel tower or mast with a large number of
transmitter antennas, the operator should coordinate with all parties to ensure that the transmitter
antennas are shut down.
The base transceiver station (BTS) has RF radiation (radiation hazard). Suggestions for the
installation and operation of BTSs are given in the following section. Operators are also required
to comply with the related local regulations on erecting BTSs.
lThe antenna should be located in an area that is inaccessible to the public where the RF
radiation exceeds the stipulated value.
Issue 01 (2008-04-18)Huawei Proprietary and Confidential
lIf the areas where RF radiation exceeds the stipulated value are accessible to workers,
ensure that workers know where these areas are. They can shut down the transmitters before
entering these areas. Such areas may not exist; but if they exist, the areas must be within a
range of less than 10 m around the antennas.
lEach forbidden zone should be indicated by a physical barrier and striking sign to warn the
public or workers.
CAUTION
When handling optical fibers, do not stand close to, or look into the optical fiber outlet with
unaided eyes.
Laser transceivers or transmitters are used in the optical transmission system and associated test
tools. Because the laser that is transmitted through the optical fiber produces a small beam of
light, it has a very high power density and is invisible to human eyes. If a beam of light enters
the eye, the retina may be damaged.
Normally, staring into the end of an unterminated optical fiber or broken optical fiber with the
unaided eyes from a distance of more than 150 mm [5.91 in.] will not cause eye injury. Eyes
may, however, be damaged if an optical tool such as a microscope, magnifying glass or eye
loupe is used to stare into the bare optical fiber end.
Read the following guidelines to prevent laser radiation:
lOnly the trained and authorized personnel can perform the operation.
lWear a pair of eye-protective glasses when you are handling lasers or optical fibers.
lEnsure that the optical source is switched off before disconnecting optical fiber connectors.
lNever look into the end of an exposed optical fiber or an open connector if you cannot
ensure that the optical source is switched off.
lTo ensure that the optical source is switched off, use an optical power meter.
lBefore opening the front door of an optical transmission system, ensure that you are not
exposed to laser radiation.
lNever use an optical tool such as a microscope, a magnifying glass, or an eye loupe to look
into the optical fiber connector or end.
Read the following instructions before handling optical fibers:
lOnly the trained personnel can cut and splice optical fibers.
lBefore cutting or splicing an optical fiber, ensure that the optical fiber is disconnected from
the optical source. After disconnecting the optical fiber, use protecting caps to protect all
the optical connectors.
lCheck the ladder before using it. Check the maximum weight that the ladder can support.
lNever overload the ladder.
Placing the Ladder
lThe slant angle is preferred to be 75
with arms, as shown in Figure 1-3. When using a ladder, place the wider end of the ladder
on the ground and take protective measures on the base of the ladder against slippage. Place
the ladder on a stable ground.
When climbing the ladder, ensure the following:
lThe gravity of the body does not shift from the edge of the ladder.
lKeep balance on the ladder before performing any operation.
lDo not climb higher than the fourth highest step of the ladder.
If you tend to climb to the roof, the length of the ladder should be at least one meter higher than
the eave, as shown in Figure 1-4.
o
. The slant can be measured with the angle square or
Do not drill on the cabinet without permission. Inappropriate drilling on the cabinet may damage
the electromagnetic shielding and internal cables. Metal shavings from the drilling may result
in a short-circuit of the circuit board if they get into the cabinet.
lBefore drilling a hole on the cabinet, remove the cables from the cabinet.
lDuring the drilling, wear blinkers to protect your eyes.
Issue 01 (2008-04-18)Huawei Proprietary and Confidential