Huawei BTS3900A User manual

BTS3900A GSM
V300R008
Commissioning Guide
Issue 04
Date 2008-11-20
Part Number
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd

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
Shenzhen 518129
People's Republic of China
Website: http://www.huawei.com
Email: [email protected]
Copyright © Huawei Technologies Co., Ltd. 2008. All rights reserved.
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 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.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd

Contents
About This Document.....................................................................................................................1
1 Safety Information.....................................................................................................................1-1
1.1 Safety Precautions...........................................................................................................................................1-1
1.2 Electricity Safety.............................................................................................................................................1-3
1.3 Inflammable Environment...............................................................................................................................1-5
1.4 Battery.............................................................................................................................................................1-5
1.5 Radiation.........................................................................................................................................................1-7
1.6 Working at Heights.........................................................................................................................................1-9
1.7 Mechanical Safety.........................................................................................................................................1-11
1.8 Others............................................................................................................................................................1-12
2 General Requirements for BTS3900A Commissioning......................................................2-1
2.1 BTS3900A Commissioning Prerequisites.......................................................................................................2-2
2.2 BTS3900A Commissioning Resources...........................................................................................................2-2
3 BTS3900A Commissioning Procedure...................................................................................3-1
4 Starting the Site Maintenance Terminal System.................................................................4-1
4.1 Setting the IP Address of the Site Maintenance Terminal PC........................................................................4-2
4.2 Connecting the Site Maintenance Terminal PC to the BTS............................................................................4-2
4.3 Locally Logging In to the BTS.......................................................................................................................4-3
5 Running the BTS3900A Software...........................................................................................5-1
5.1 Obtaining the Site Management Rights..........................................................................................................5-2
5.2 Checking the Active Software Version...........................................................................................................5-2
5.3 Forcibly Loading Software..............................................................................................................................5-4
5.4 Activating Software.........................................................................................................................................5-6
6 Checking the Transmission and Networking......................................................................6-1
6.1 Checking the Transmission Between the BBU and the RFUs........................................................................6-2
6.2 Checking the Transmission Between the BBU and the BSC..........................................................................6-3
6.3 Checking the Consistency Between Hardware Installation and Data Configuration......................................6-5
7 Commission the Antenna System...........................................................................................7-1
7.1 Measuring the VSWR at the Antenna Port.....................................................................................................7-2
7.2 Checking the Antenna Connection..................................................................................................................7-2
BTS3900A GSM
Commissioning Guide Contents
Issue 04 (2008-11-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
i

7.2.1 Checking the Antenna Connection with an MS.....................................................................................7-3
7.2.2 Checking the Antenna Connection by Using a Drive Tester.................................................................7-4
7.3 Measuring the Output Power of the TRX.......................................................................................................7-4
8 Checking the Operating Status of the BTS3900A................................................................8-1
8.1 Checking the Status of the BTS3900A LEDs.................................................................................................8-2
8.2 Checking the Alarm Information of the BTS3900A.......................................................................................8-4
8.3 Performing the Loopback Test........................................................................................................................8-6
9 Commission the BTS3900A services.......................................................................................9-1
9.1 Performing the Loopback Test of a Channel...................................................................................................9-2
9.1.1 Performing the Loopback Test of a Signaling Channel.........................................................................9-2
9.1.2 Performing the Loopback Test over the Traffic Channel.......................................................................9-3
9.2 Testing CS Services........................................................................................................................................9-4
9.3 Testing PS Services.........................................................................................................................................9-5
10 Checking the BTS3900A Environment...............................................................................10-1
10.1 BTS Environment Alarm Types..................................................................................................................10-2
10.2 Monitoring Environment.............................................................................................................................10-3
11 FAQs for BTS Commissioning............................................................................................11-1
11.1 Failed Communication Between the Site Maintenance Terminal and the BTS..........................................11-2
11.2 Faulty E1 Link.............................................................................................................................................11-3
11.3 Failure of an MS to Search the Network.....................................................................................................11-5
11.4 Service Dialing Failure................................................................................................................................11-6
11.5 Low GRPS Data Transmission Rate...........................................................................................................11-6
12 Data Sheet for Commissioning...........................................................................................12-1
Contents
BTS3900A GSM
Commissioning Guide
ii Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 04 (2008-11-20)

Figures
Figure 1-1 Wearing an ESD wrist strap...............................................................................................................1-5
Figure 1-2 Lifting a weight................................................................................................................................1-10
Figure 1-3 Slant angle........................................................................................................................................1-11
Figure 1-4 One meter higher than the eave........................................................................................................1-11
Figure 4-1 Communication failed dialog box......................................................................................................4-4
Figure 4-2 Site Maintenance Terminal System window......................................................................................4-4
Figure 4-3 Set Communication Port Parameter dialog box.................................................................................4-5
Figure 5-1 Site Management Right dialog box....................................................................................................5-2
Figure 5-2 Board Operation window....................................................................................................................5-3
Figure 5-3 Topology Management dialog box...................................................................................................5-4
Figure 5-4 Board Information dialog box..........................................................................................................5-4
Figure 5-5 Software Download dialog box..........................................................................................................5-6
Figure 5-6 Software Activation dialog box..........................................................................................................5-8
Figure 5-7 Software Activation dialog box..........................................................................................................5-8
Figure 6-1 Physical loopback of E1/T1 at the DDF.............................................................................................6-4
Figure 6-2 Slots for boards or modules shown in the window.............................................................................6-6
Figure 6-3 Star topology between the DRFUs and the BBU...............................................................................6-7
Figure 6-4 Topology Management window (star topology)..............................................................................6-8
Figure 6-5 Board Operation window....................................................................................................................6-8
Figure 6-6 Parameter Management dialog box.................................................................................................6-9
Figure 8-1 Board Management window............................................................................................................8-4
Figure 8-2 Topology Management window.......................................................................................................8-5
Figure 8-3 Board Alarm Informationdialog box...............................................................................................8-6
Figure 8-4 Board Operation window.................................................................................................................8-7
Figure 8-5 Loop Test dialog box..........................................................................................................................8-8
Figure 8-6 Topology Management dialog box...................................................................................................8-8
Figure 9-1 BT Loop Test dialog box....................................................................................................................9-3
Figure 9-2 Channel Loop Test window................................................................................................................9-4
Figure 10-1 Environment Monitor dialog box...................................................................................................10-4
Figure 11-1 Checking the IP address of the board.............................................................................................11-3
Figure 11-2 Physical loopback of the E1/T1 cable on the BTS side..................................................................11-4
BTS3900A GSM
Commissioning Guide Figures
Issue 04 (2008-11-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
iii

Tables
Table 2-1 Tools and instruments required for the commissioning.......................................................................2-2
Table 5-1 Parameters available in the Software Download dialog box................................................................5-5
Table 5-2 Parameters in the Software Activation dialog box...............................................................................5-7
Table 6-1 Mapping between the board/module names shown in the window and the actual names...................6-6
Table 8-1 Normal status of the LEDs on the board and modules in the BBU.....................................................8-2
Table 8-2 Normal status of the LEDs on the DRFU............................................................................................8-2
Table 8-3 Normal status of the LEDs on the GRFU............................................................................................8-3
Table 8-4 Normal status of the LEDs on the GATM...........................................................................................8-3
Table 8-5 Normal status of the LEDs on the FMUA...........................................................................................8-3
Table 8-6 Normal status of the LEDs on the DPMU...........................................................................................8-4
Table 8-7 Parameters in the loopback test dialog box..........................................................................................8-7
Table 10-1 Parameters in the Environment Monitor dialog box........................................................................10-3
Table 11-1 Possible causes and handling suggestions for failed communication between the Site Maintenance
Terminal and the BTS.........................................................................................................................................11-2
Table 11-2 Meaning of the states of the LIU LED (UELP used)......................................................................11-4
Table 11-3 Meanings of the states of the LIU LED (UELP not used)...............................................................11-5
Table 11-4 Possible causes and handling suggestions for service dialing failure..............................................11-6
Table 11-5 Description of the DIP switch SW2 on the GTMU.........................................................................11-6
Table 12-1 BTS commissioning data sheet........................................................................................................12-1
BTS3900A GSM
Commissioning Guide Tables
Issue 04 (2008-11-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
v

About This Document
Purpose
This document describes the procedures for commissioning and verifying the BTS3900A GSM
after it is installed. The commissioning and verification procedure ensures that the BTS3900A
GSM operates as required. The procedures involve the following tasks: starting the Site
Maintenance Terminal System, running the BTS3900A GSM software, checking the
transmission and networking, commissioning the antenna system, checking the operating status
of the BTS3900A GSM, testing the services of the BTS3900A GSM, checking the BTS3900A
GSM environment, and typical FAQs for the commissioning.
Product Version
The following table lists the product version related to this document.
Product Name Product Version
BTS3900A GSM(hereinafter referred to
as BTS3900A)
V300R008
Intended Audience
This document is intended for:
lField engineers
lTechnical support engineers
Change History
For changes in the document, refer to Changes in BTS3900A GSM Commissioning Guide.
Organization
1 Safety Information
2 General Requirements for BTS3900A Commissioning
The general requirements for BTS3900A commissioning are the commissioning prerequisites
and commissioning resources.
3 BTS3900A Commissioning Procedure
BTS3900A GSM
Commissioning Guide About This Document
Issue 04 (2008-11-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
1

This describes how to commission the BTS3900A.
4 Starting the Site Maintenance Terminal System
Before starting the Site Maintenance Terminal, firstly, set the IP address of the Site Maintenance
Terminal PC; secondly, connect the Site Maintenance Terminal PC to the BTS; finally, log in
to the Site Maintenance Terminal.
5 Running the BTS3900A Software
This describes how to load the correct software version to the boards or modules in the
BTS3900A cabinet and how to activate the board software.
6 Checking the Transmission and Networking
The purpose of checking the transmission and networking is to ensure that the BTS3900A
transmission cables and hardware are correctly installed. The items to be checked consist of the
transmission between the BBU and the RFU, the transmission between the BBU and the BSC,
and the consistency between the actual networking and the data configuration.
7 Commission the Antenna System
This describes how to commission the antenna system. You must check whether the antenna is
connected properly and whether the Voltage Standing-Wave Ratio (VSWR) is normal. If an
RET antenna is configured, you must commission the RET antenna.
8 Checking the Operating Status of the BTS3900A
Before commissioning the BTS3900A, you should ensure that the modules and cables are
correctly installed, and the BTS3900A operates normally.
9 Commission the BTS3900A services
This describes how to test whether the BTS3900A supports CS services and PS services by using
an MS.
10 Checking the BTS3900A Environment
This describes the various environment alarms of the BTS3900A. It also describes how to
perform environment monitoring for the BTS3900A.
11 FAQs for BTS Commissioning
This describes the fault symptoms and cause analysis in the BTS commissioning.
12 Data Sheet for Commissioning
The commissioning data sheet is used to record the process and result of the commissioning.
Conventions
1. Symbol Conventions
The following symbols may be found in this document. They are defined as follows
About This Document
BTS3900A GSM
Commissioning Guide
2 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 04 (2008-11-20)

Symbol Description
DANGER
Indicates a hazard with a high level of risk that, if not avoided,
will result in death or serious injury.
WARNING
Indicates a hazard with a medium or low level of risk which, if
not avoided, could result in minor or moderate injury.
CAUTION
Indicates a potentially hazardous situation that, if not avoided,
could cause equipment damage, data loss, and performance
degradation, or unexpected results.
TIP Indicates a tip that may help you solve a problem or save your
time.
NOTE Provides additional information to emphasize or supplement
important points of the main text.
2. General Conventions
Convention Description
Times New Roman Normal paragraphs are in Times New Roman.
Boldface Names of files,directories,folders,and users are in boldface. For
example,log in as user root .
Italic Book titles are in italics.
Courier New Terminal display is in Courier New.
3. Command Conventions
Convention Description
Boldface The keywords of a command line are in boldface.
Italic Command arguments are in italic.
[ ] Items (keywords or arguments) in square brackets [ ] are optional.
{x | y | ...} Alternative items are grouped in braces and separated by vertical
bars.One is selected.
[ x | y | ... ] Optional alternative items are grouped in square brackets and
separated by vertical bars.One or none is selected.
{ x | y | ... } * Alternative items are grouped in braces and separated by vertical
bars.A minimum of one or a maximum of all can be selected.
BTS3900A GSM
Commissioning Guide About This Document
Issue 04 (2008-11-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
3

Convention Description
[ x | y | ... ] * Alternative items are grouped in braces and separated by vertical
bars.A minimum of zero or a maximum of all can be selected.
4. GUI Conventions
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 .
5. Keyboard Operation
Convention Description
Key Press the key.For example,press Enter and press Tab.
Key1+Key2 Press the keys concurrently.For example,pressing Ctrl+Alt+A
means the three keys should be pressed concurrently.
Key1,Key2 Press the keys in turn.For example,pressing Alt,A means the two
keys should be pressed in turn.
6. Mouse Operation
Action Description
Click Select and release the primary mouse button without moving the
pointer.
Double-click Press the primary mouse button twice continuously and quickly
without moving the pointer.
Drag Press and hold the primary mouse button and move the pointer
to a certain position.
About This Document
BTS3900A GSM
Commissioning Guide
4 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 04 (2008-11-20)

1 Safety Information
1.1 Safety Precautions
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.
BTS3900A GSM
Commissioning Guide 1 Safety Information
Issue 04 (2008-11-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
1-1

Complying with the Local Safety Regulations
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.
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.
1 Safety Information
BTS3900A GSM
Commissioning Guide
1-2 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 04 (2008-11-20)

Device Safety
lBefore operation, the device must be secured on the floor or other fixed objects, such as
the walls and the mounting racks.
lDo not block ventilation openings while the system is running.
lWhen installing the panel, tighten the screw with the tool.
1.2 Electricity Safety
High Voltage
DANGER
lThe high voltage power supply provides power for running the system. Direct contact with
the high voltage power supply or contact through damp objects may result in fatal danger.
lNon-standard and improper high voltage operations may result in fire and electric shock.
lThe personnel who install the AC facility must be qualified to perform operations on high
voltage and AC power supply facilities.
lWhen installing the AC power supply facility, follow the local safety regulations.
lWhen operating the AC power supply facility, follow the local safety regulations.
lWhen operating the high voltage and AC power supply facilities, use the specific tools
instead of common tools.
lWhen the operation is performed in a damp environment, ensure that water is kept off the
device. If the cabinet is damp or wet, shut down the power supply immediately.
Thunderstorm
The following requirements are suitable only for the wireless base station or the device with an
antenna or GPS antenna.
DANGER
In a thunderstorm, do not perform operations on high voltage and AC power supply facilities or
on a steel tower and mast.
High Electrical Leakage
CAUTION
Ground the device before powering on the device. Otherwise, the personnel and device are in
danger.
BTS3900A GSM
Commissioning Guide 1 Safety Information
Issue 04 (2008-11-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
1-3

If the "high electrical leakage" flag is stuck to the power terminal of the device, you must ground
the device before powering it on.
Power Cable
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.
Fuse
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.
Figure 1-1shows how to wear an ESD wrist strap.
1 Safety Information
BTS3900A GSM
Commissioning Guide
1-4 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 04 (2008-11-20)

Figure 1-1 Wearing an ESD wrist strap
1.3 Inflammable Environment
DANGER
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.
1.4 Battery
Storage Battery
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.
BTS3900A GSM
Commissioning Guide 1 Safety Information
Issue 04 (2008-11-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
1-5

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.
General Operations
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
DANGER
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.
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
CAUTION
lDo not use unsealed lead-acid storage batteries, because the gas emitted from it may result
in fire or device corrosion.
lLay 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
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.
1 Safety Information
BTS3900A GSM
Commissioning Guide
1-6 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 04 (2008-11-20)

Acid
CAUTION
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): NaHCO3
lSodium carbonate (soda): Na2CO3
Antacids must be used according to the instructions provided by the battery manufacturer.
Lithium Battery
CAUTION
There is danger of explosion if the battery is incorrectly replaced.
lReplace the lithium battery with the same or equivalent type recommended by the
manufacturer.
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
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.
BTS3900A GSM
Commissioning Guide 1 Safety Information
Issue 04 (2008-11-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
1-7

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.
Laser
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.
1 Safety Information
BTS3900A GSM
Commissioning Guide
1-8 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 04 (2008-11-20)