Huawei CBTS3612-1900 Users Manual

HUAWEI

Airbridge cBTS3612 CDMA Base Station Installation Manual

Hardware Installation

HUAWEI

Airbridge cBTS3612 CDMA Base Station Installation Manual

Software Installation & System Commissioning

1.5cm

Airbridge cBTS3612 CDMA Base Station

7cm Font: Arial 22pt , Product name: Bold

Installation Manual

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HUAWEI

Ver: T2-030448-

20030125-C-1.21

BOM: 31040648

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Huawei Technologies Co., Ltd.

Administration Building, Huawei Technologies Co., Ltd., Bantian, Longgang District, Shenzhen, P. R. China Postal Code: 518129 Website: http://www.huawei.com

BOM: 31040648

Airbridge cBTS3612 CDMA Base Station Installation Manual

15.7cm

Huawei Technologies Co., Ltd.

10cm

1. 16K Cover for hectograph; Font: Arial 22 pt; Product name: Bold

Airbridge cBTS3612 CDMA

Base Station

Installation Manual

HUAWEI

1. Hardware Installation

2. Software Installation & System Commissioning

Airbridge cBTS3612 CDMA Base Station Installation Manual

V100R002

Airbridge cBTS3612 CDMA Base Station Installation Manual

Manual Version T2-030448-20030125-C-1.21 Product Version V100R002 BOM 31040648

Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. Please feel free to contact our local office, customer care center or company

headquarters.

Huawei Technologies Co., Ltd.

Address: Administration Building, Huawei Technologies Co., Ltd., Bantian, Longgang District, Shenzhen, P. R. China Postal Code: 518 129 Website: http://www.huawei.com Email: suppo rt@huawei.com

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

, HUAWEI, C&C08, EAST8000, HONET, , ViewPoint, INtess, ETS, DMC,

TELLIN, InfoLink, Netkey, Quidway, SYNLOCK, Radium, M900/M1800, TELESIGHT, Quidview, Musa, Airbridge, Tellwin, Inmedia, VRP, DOPRA, iTELLIN, HUAWEI OptiX, C&C08 iNET, NETENGINE, OptiX, SoftX, iSite, U-SYS, iMUSE,

OpenEye, Lansway, SmartAX are trademarks of Huawei Technologies Co., Ltd.

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 all statements, information, and recommendations in this document

don't constitute the warranty of any kind, express or implied.

About This Manual

Version

The product version corresponds to the manual is Airbridge cBTS3612 CDMA Base Station V100R002.

Contents

The manual introduces the insulation methods and procedure of cBTS3612. It is divided into t wo modules:

l Module 1: Hardware Installation This module describes in detail the installation procedure of the hardware system,

including preparations, equipment room, antenna & feeder, and the inspection after installation.

l Module 2: Software Installation & System Commissioning This part introduces the installation procedure of BTS maintenance terminal software

and the BTS system software, as well as the tes ting and commissioning of the system.

Environmental Protection

This product has been designed to comply with the requirements on environmental protection. For the proper storage, use and disposal of this product, national laws and regulations must be obser ved.

Target Readers

The manual is intended for the following readers:

l Installation engineers & technicians l Operation & maintenance personnel

Conventions

This document uses the following conventions:

I. General conventions

Convention Description

Arial Normal paragraphs are in Arial. Arial Narrow Warnings, cautions, notes and tips are in Arial Narrow.　

Terminal Display　

II. Command conventions

Convention Description

boldface font Command keywords (which must be input unchanged) are in boldface.

italic font Command arguments for which you supply values are in italics. [ ] Elements in square brackets [ ] are optional.

{ x | y | ... } 　

[ x | y | ... ]　

{ x | y | ... } *　

[ x | y | ... ] *　

! A line starting with an exclamation mark is comments.

Terminal Display is in Courier New; message input by the user

via the terminal is in boldface.　

Alternative keywords are grouped in braces and separated by vertical bars. One is selected.

Optional alternative keywords are grouped in square brackets and separated by vertical bars. One (or none) is selected. 　

Alternative keywords are grouped in brac es and separated by vertical bars. A minimum of one and maximum of all can be selected. 　

Optional alternative keywords are grouped in square brackets and separated by vertical bars. Many (or none) are selected. 　

III. GUI conventions

Convention Description

< > Message entered via the terminal is within angle brackets. [ ] MMIs, menu items, data table and field names are inside square brackets [ ].

IV. Keyboard operation

Format Description

<Key> Press the key with key name expressed with a pointed bracket, e.g.

<Key1+Key2> Press the keys concurrently; e.g. <Ctrl+Alt+A>means the three keys should

Multi-level menus are separated by forward slashes (/). Menu items are in boldface. For example, [File/Create/Folder].

<Enter>, <Tab>, <Backspace>, or<A>.

be pressed concurrently.

Format Description

<Key1, Key2> Press the keys in turn, e.g. <Alt, A>means the two keys should be pressed

in turn.

[Menu Option] The item with a square bracket indicates the menu option, e.g. [System]

[Menu1/Menu2/Menu3] Multi-level menu options, e.g. [System/Option/Color setup] on the main

option on the main menu. The item with a pointed bracket indicates the functional button option, e.g. <OK> button on some interface.

menu indicates [Color Setup] on the menu option of [Option], which is on the menu option of [System].

V. Mouse operation

Action Description

Click Press the left button or right button quickly (left button by default). Double Click Press the left button twice continuously and quickly. Drag Press and hold the left button and drag it to a certain position.

VI. Symbols

Eye-catching symbols are also used in this document to highlight the points worthy of special attention during the operation. They are defined as follows:

Caution, Warning, Danger: Means reader be extremely careful during the operation.

& Note Comment, Tip, Knowhow , Thought: Means a complementary description.

Installation Manual Airbridge cBTS3612 CDMA Base Station

Precautions

Table of Contents

Safety Precautions ............................................................................................................ S-1

1 Overview ................................................................................................................... S-1

1.1 Symbol Explanation ......................................................................................... S-2

2 Toxic Articles ............................................................................................................. S-3

2.1 Beryllium Oxide ............................................................................................... S-3

2.2 Hydrochloride .................................................................................................. S-4

2.3 Hydrofluoride ................................................................................................... S-4

3 Electrical Safety ......................................................................................................... S-4

3.1 High Voltage .................................................................................................... S-4

3.2 Power Cables .................................................................................................. S-5

3.3 Tools ................................................................................................................S-5

3.4 Drilling ............................................................................................................. S-6

3.5 Thunderstorms ................................................................................................ S-6

3.6 Static Electricity............................................................................................... S-6

3.7 Power Labels................................................................................................... S-8

3.8 Leakage Current .............................................................................................. S-8

3.9 Flammable Air Environment............................................................................. S-9

4 Batteries .................................................................................................................... S-9

4.1 General Operations ......................................................................................... S-9

4.2 Short Circuit ................................................................................................... S-10

4.3 Harmful Gases ............................................................................................... S-10

4.4 High Temperature.......................................................................................... S-10

4.5 Acid Liquid..................................................................................................... S-11

4.6 Battery Replacement ..................................................................................... S-11

5 Microwave and Magnetic Field ................................................................................ S-11

5.1 Introduction ....................................................................................................S-11

5.2 Definition of the Environment ........................................................................ S-12

5.3 Operation Codes ........................................................................................... S-12

6 Laser ....................................................................................................................... S-12

7 High Temperature.................................................................................................... S-13

8 Fans ........................................................................................................................ S-13

9 Working at High Altitudes ........................................................................................ S-14

9.1 General Operations ....................................................................................... S-14

9.2 Safety Codes for Using Ladders .................................................................... S-14

10 Other Items ............................................................................................................S-17

10.1 Hoisting of Heavy Objects ........................................................................... S-17

10.2 Handling of Heavy Objects .......................................................................... S-18

Installation Manual Airbridge cBTS3612 CDMA Base Station

10.3 Sharp Edges ................................................................................................ S-19

10.4 Inserting & Drawing Out the Boards ............................................................ S-19

10.5 Bundling the Signal Cables.......................................................................... S-20

10.6 Maintenance and Commissioning by a Single Person is not Allowed.......... S-20

Precautions

Table of Contents

Installation Manual Airbridge cBTS3612 CDMA Base Station

Safety Precautions

1 Overview

This section covers part of the safety precautions to be observed during the installation, maintenance, and the related operation of Huawei-developed

network equipment.

Caution:

Before any operation, please carefully go through the operation instructions and precautions so as to prevent accidents. The signs such as "Caution, Attention, Warning and Danger" in manuals are merely the supplements to safety precautions in operations rather than all the safety precautions to be observed. Therefore, personnel engaged in the installation and maintenance of Huawei-developed products should have basic knowledge of safe operation, undergo relevant training and be qualified for related operations.

Precautions

Safety Precautions

Please abide by local safety regulations during the operation. The safety precautions in this manual only serve as supplements to local safety

regulations. When operating Huawei-developed products and equipment, please strictly

abide by the precaution points and specific safety instructions concerning the equipment provided by Huawei. The safety warnings listed in this manual only show the precaution points that Huawei are aware of. Huawei Company does not bear any consequence resulting from violation against universal regulations for safety operation, or violation against the safety codes in designing, production and equipment using.

The personnel responsible for the installation and maintenance of Huawei -developed products should undergo strict training, command the correct operation methods and get acquainted with various safety precautions before

performing any operation such as equipment installation, maintenance, etc.

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Installation Manual Airbridge cBTS3612 CDMA Base Station

1.1 Symbol Explanation

The signs shown in Table 1 in this manual, are intended to remind readers of the safety precautions to be observed during the operations of equipment

installation and maintenance. Safety prompts are divided into the following levels: Danger, Warning, Attention

and Caution. The format is shown in the following: The text note of the safety level is indicated to the right of the symbol. And the detailed explanations of the safety precautions are shown below the symbol.

Danger:

Indicating that casualties or serious accident may occur if this safety instruction is ignored.

Precautions

Safety Precautions

Warning:

Indicating that serious or major injuries may occur or equipment may be damaged if this safety instruction is ignored.

Attention:

Indicating that major injuries may occur or equipment may be damaged if this safety instruction is ignored.

Caution:

Indicating that injuries may occur or equipment may be damaged if this safety instruction is ignored.

The types and meanings of safety signs are shown in the following table.

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Table 1 Types and meanings of safety signs

Safety symbol Meaning

Precautions

Safety Precautions

Common warn ing symbol: Indicates general safety precautions.

Anti-static symbol: Indicates that the equipment is sensitive to static electricity.

Live-line symbol: Indicates dangerous voltage.

Microwave symbol: Indicates powerful electromagnetic field.

Laser symbol: Indicates powerful laser beam.

Scald symbol: Indicates that the equipment surface with high temperature, which might cause scald or burns on the personnel. Upon this warning, people should not touch the surface, so as to avoid any scald or burn.

2 Toxic Articles

2.1 Beryllium Oxide

Warning:

Some equipment components carrying toxic beryllium oxide are chosen unavoidably.

l Only when the components carrying beryllium oxide are damaged may the

beryllium oxide do harm to human body. The personnel who contact or handle the components should be aware of the component peculiarity and take corresponding preventive measures beforehand.

l To dispose of the component, the personnel should make necessary

chemical treatment or special waste processing for the component carrying beryllium in accordance with related local regulations. The components carrying beryllium should not be discarded freely.

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2.2 Hydrochloride

Warning:

Some components of the equipment carrying hydrochloride are used as it is unavoidable. Toxic gases will be generated by these components when burned.

l Toxic gases will be generated when burning these components. Preventive

measures should be taken beforehand so that the components will not get burned, and even if the burning occurs, the toxic gases will not be inhaled into human body. The components should not be discarded freely. To dispose of the component, the personnel should make necessary chemical treatment or special waste processing for the component carrying hydrochloride in accordance with related local regulations.

Precautions

Safety Precautions

2.3 Hydrofluoride

Warning:

Some equipment components carrying hydrofluoride are chosen unavoidably. Toxic gases will be generated when burning these components.

l Preventive measures should be taken beforehand so that the components

will not get burned, and even if the burning occurs, the toxic gases will not be inhaled into human body. The components should not be discarded freely. To dispose of the component, the personnel should make necessary chemical treatment or special waste processing for the component carrying hydrofluoride in accordance with related local regulations.

3 Electrical Safety

3.1 High Voltage

Danger:

High voltage power supply provides electricity for equipment operation. Direct contact or indirect contact via damp objects and conductors with high-voltage wires or mains supply may be fatal.

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Installation Manual Airbridge cBTS3612 CDMA Base Station

l Installation of AC power supply equipment must be implemented in

compliance with local safety regulations, and the personnel engaged in AC power supply must be qualified for high-voltage and AC operations.

l Electrical conductors such as watches, bracelets and rings must be

removed before operation.

l If the cabinet is found to be wet, please turn off power supply immediately. l Keep the equipment dry upon operation under humid environment.

Warning:

Improper high-voltage operations may result in fire accidents and electric shocks. Therefore, AC power cables must be laid in compliance with local codes and regulations. High-voltage operators should be trained and qualified.

3.2 Power Cables

Precautions

Safety Precautions

3.3 Tools

Caution:

Live installation and removal of power cables are prohibited. Electric sparks or arcs may be generated when power cables get in touch with conductors, which may cause fire accidents or

eye injuries.

l Power must be switched off before installation and removal of the power

cable.

l Before connecting a cable, make sure that the cable and cable label to be

used should match actual installation requirements.

Warning:

High-voltage and AC operations require special tools instead of general- purpose or makeshift tools.

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Installation Manual Airbridge cBTS3612 CDMA Base Station

3.4 Drilling

Warning:

Unauthorized drilling on the cabinet is strictly prohibited. Improper drilling may damage the connections and cables inside the cabinet and the metal filings produced during the drilling may cause short-circuits of the circuit boards if they fall into the cabinet.

l Wear protective insulation gloves and remove the cables inside the cabinet

before drilling holes on the cabinet.

l Take care of your eyes when drilling holes. As the splashing metal burrs

&scraps may hurt your eyes.

l Prevent metal scraps from entering the cabinet inside. l Improper drilling will damage the electromagnetic shielding performance of

the cabinet.

l Clean up the metal scraps after drilling.

Precautions

Safety Precautions

3.5 Thunderstorms

Danger:

High-voltage and AC operations and operations on the steel towers and masts are strictly prohibited in a stormy weather.

l Thunderstorms can generate powerful electromagnetic field in the

atmosphere. Therefore, equipment should be grounded properly in order to prevent the equipment from being thunderstruck.

3.6 Static Electricity

Caution:

Static electricity generated by the human body may damage the electrostatic-sensitive parts on the circuit boards, such as large-scale integrated circuit (IC).

l The grating generated between human activities and the components is the

rootage for electrostatic charge accumulation. In dry climate, the

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Installation Manual Airbridge cBTS3612 CDMA Base Station

electrostatic charge carried by human body may go up to 30 kV, which will remain on the human body for a rather long period of time. The operator’s contact with the sensitive component and the resultant electric discharge will cause damage to the component.

l Before contacting/touching any equipment such as holding plug-in boards,

circuit boards and IC chips, put on the anti-static wrist strap with one end well grounded so as to prevent sensitive parts from getting damaged by static electricity on the human body.

l Before operators touch the board or module, they should release the

electrostatic charge in their body. That is, before the operator touches a board or a module, he or she must wear the anti -static grounded wrist strap. The connecting line between the wrist and the grounding point should connect in series with a resistance greater than 1 M¦¸ to protect people from being accidentally shocked. The resistance value greater than 1 M, is rather low in terms of electrostatic voltage discharging. The anti-static wrist strap should be checked regularly. Using other cable to replace the cable of anti -static wrist strap is strictly prohibited.

l Electrostatic -sensitive board or module should not be in contact with the

object with static electricity or the object that may easily generate static electricity. For instance, packaging bags, delivery boxes and conveyor belts made of insulating materials will generate static electricity by themselves, and can cause electrostatic charging when in contact with human body or the earth and might thus bring forth damages.

l Electrostatic -sensitive boards or modules can only contact quality

discharging materials, such as anti -static packing bags. The board in stock or in the course of transportation should be packaged with anti-static packing bag.

l Before the measurement device is connected to boards or modules, first

discharge its static electricity, that is, the measurement device should be grounded first.

l The single board or module should not be placed near strong DC magnetic

field, for instance, near the cathode ray tube of the oscilloscope. The safety distance should be at least 10 cm.

l Damage caused by static electricity is acc umulative. If the damage is slight,

the component will not malfunction. However, as the number of damages increase, the components may suddenly fail. The electrostatic discharging damage to the component is of two types: obvious damage and hidden damage. Hidden damage is not shown when the damage occurs, whereas the component may become vulnerable and easily get damaged under the condition of over-voltage and of high-temperature.

Precautions

Safety Precautions

The correct way of wearing anti-static wrist strap is shown in Figure 1.

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Installation Manual Airbridge cBTS3612 CDMA Base Station

Plug of anti-static wrist strap

Figure 1 Wearing the anti -static wrist strap

3.7 Power Labels

Caution:

Precautions

Safety Precautions

Before connecting the cables, check the correctness of labels and then make the connection.

3.8 Leakage Current

Warning:

To avoid the occurrence of large leakage current, the equipment must be grounded before connecting to the power supply.

l Before connecting the AC input power supply, the operation and

maintenance personnel should first connect the protection-grounding terminal of the equipment housing to the earth. The purpose of doing so is to avoid electric shock on human body resulting from leakage current, which is usually caused by the earth capacitance of the EMI wave filter at the AC power supply input terminal of the equipment or the Y capacitance of the primary power supply.

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Installation Manual Airbridge cBTS3612 CDMA Base Station

3.9 Flammable Air Environment

Danger:

The equipment should not be placed in an environment where flammable, explosive air or smog exists. No operation should be performed under such an environment.

l The operation on any electronic equipment under such an environment will

pose absolute threat to the equipment & the operating personnel.

4 Batteries

4.1 General Operations

Precautions

Safety Precautions

Danger:

Before undertaking the battery operations, the personnel should carefully read the safety precautions for handling batteries and the correct connection of batteries.

l Improper operation of batteries will be dangerous. Guard against

short -circuits of batteries or electrolyte spillover in operation, which may pose a potential threat to equipment, corrode metal articles and circuit boards, damage equipment and result in short circuit of circuit board .

l Before installation and maintenance of batteries, take the following

measures to ensure safety:

l The batteries should be handled with care. Avoid strenuous vibration when

handling them.

l Metal articles such as watches, bracelets and rings must be removed. l Use special insulated tools. l Wear eye protection gears and take preventive measures. l Wear rubber gloves and apron in case of electrolyte spillover. l Hold the positive pole of batteries upright during handling. Do not handle

them upside down or in slant position.

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Installation Manual Airbridge cBTS3612 CDMA Base Station

4.2 Short Circuit

Caution:

Short-circuit of the battery will cause personal injury. Although the voltage of ordinary battery is not high, the powerful instantaneous current generated by short-circuit may release immense energy.

l Prevent short-circuits of batteries caused by metal articles, such as

short -circuit caused by improper use of tools. If allowed, first disconnect the batteries and then proceed with other operations.

4.3 Harmful Gases

Precautions

Safety Precautions

Caution:

Unsealed lead acid batteries should not be used, as the gas released from the batteries may cause fires or equipment corrosion. Batteries should be fixed horizontally.

l Batteries may release inflammable gases in operation, so the place where

the batteries are placed should be well ventilated and fire prevention measures should be taken.

4.4 High Temperature

Caution:

Excessively high temperature of batteries will cause deformation and damage to batteries and spillover of acid liquid.

l When the temperature of battery is over 60

there is spillover of acid liquid.

l In case of acid liquid spillover, please make proper and timely treatment of

acid spillover.

C, check and see whether

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Installation Manual Airbridge cBTS3612 CDMA Base Station

4.5 Acid Liquid

Caution:

In case of acid liquid spillover, make sure that the spillovers are absorbed and neutralized.

l To move leaking batteries, bear in mind the possible damages that may be

caused by the acid liquid. Once acid liquid is found to have spilt over, absorb and neutralize it with the following materials.

Bicarbonate: NaHCO3 Barilla: Na2CO3 Soda: Na2CO3$10H2O

l Consult the battery manufacturers as regards materials used to absorb and

neutralize acid liquid.

Precautions

Safety Precautions

4.6 Battery Replacement

Warning:

Operation and maintenance personnel should not replace the batteries of specified model with that of other model. Otherwise, possible explosion may incur.

5 Microwave and Magnetic Field

5.1 Introduction

The equipment antenna in service will generate electromagnetic radiation. Standing too close to the antenna violates the safety codes. The equipment can only be installed and maintained by trained professional personnel. The radiation design of the equipment should meet the IEEE C95.1-1991 recommendation. When working near the full-power transmitting antenna, one should firs t read the following safety working requirements.

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Installation Manual Airbridge cBTS3612 CDMA Base Station

5.2 Definition of the Environment

The uppermost level limit of the environment that can be exposed to radio magnetic radiation is of two kinds: one is "controlled environment" and the other

is "uncontrolled environment " with less radiation.

l Controlled Environment

Controlled environment refers to a certain location where the personnel who enter the area are aware of the potential threat of exposing themselves to the radio frequency radiation environment. Generally, the personnel enter such areas for the profession requirements and they get acquainted with this danger or they just pass by the areas where possible radiation exists. The magnetic field level of the area is higher than that of "uncontrolled environment" but no

greater than that of "controlled environment" listed in the table.

l Uncontrolled Environment

"Uncontrolled environment" refers to a certain location where the personnel who enter the area are not aware of the potential threat of exposing themselves to the radio frequency radiation environment, and they cannot control the environment where they are situated. This location may include living environment or working environment. The magnetic field level of the location cannot be greater than the uppermost level under the "uncontrolled

environment" listed in the table.

Precautions

Safety Precautions

5.3 Operation Codes

Warning:

When operating on the high intensity radio frequency signal equipment, bear in mind that the high-intensity microwave is detrimental to human health.

6 Laser

Warning:

Laser beams inside optical fibers may do harm to your eyes.

l During the installation and maintenance of optical fibers, keep eyes away

from, or avoid direct look at the optical fiber or optical transceiver outlet.

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Installation Manual Airbridge cBTS3612 CDMA Base Station

7 High Temperature

Warning:

It is unavoidable that the temperatures of some equipment parts are rather high. Please do not touch the surface as you wish, else scalding may occur.

l When the equipment is running in the tropical environment, the

temperature benchmark of the parts is 450C and the maximum range of temperature rise allowed is 300C under normal working conditions. When fault occurs, the maximum temperature rise allowed is 550C. So when the parts work at the high temperature of 450C under normal working conditions, their highest temperature should not exceed 750C, and when fault occurs, the highest temperature should not exceed 1000C.

Precautions

Safety Precautions

8 Fans

Warning:

To dismount the fan which is running, never dip the finger or tool into the fan that is running before the fan is powered off or stops running to avoid damage to the equipment or injuries to human body.

l Dipping the finger into the fan while it is running may cause injuries. l When replacing related parts, place the objects such as the parts, screws,

and tools properly. Make sure that they would not fall into the running fan, otherwise they will damage the fan or the related equipment.

l When replacing the peripheral equipment of the fan, never dip the finger or

board into the fan to avoid any possible injuries to the equipment or the hands.

Warning:

Keep your hands and body away from the dangerous running parts to avoid possible injuries.

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Installation Manual Airbridge cBTS3612 CDMA Base Station

9 Working at High Altitudes

9.1 General Operations

Warning:

When working at heights, beware of falling objects.

Working at heights must be in accordance with the related national regulations:

l Personnel working at heights must have undergone appropriate training. l Take care of the mechanical devices and tools and prevent them from

falling down.

l Follow safety precautions and wear helmet and safety belt. l Put on cold-proof clothes before working at heights in cold areas. l Check and approve all the lifting devices before working at heights.

Precautions

Safety Precautions

9.2 Safety Codes for Using Ladders

l Before using the ladder, first check and see whether the ladder is damaged.

Make sure the ladder is safe for use. Overload on the ladder is strictly prohibited.

l When operating under the conditions that the leaning distance of the ladder

is over 5measurement, and that of the erected ladder with two-foot is over 3meters, and other dangerous environment, the ladder should be held by somebody or relevant safe measures should be effected. The A-shaped ladder should be completely stretched for using, as shown in Figure 2 below.

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Installation Manual Airbridge cBTS3612 CDMA Base Station

Figure 2 The angle at which the ladder should be leaned

Precautions

Safety Precautions

Figure 3 Stretching the A-shaped ladder

l It is recommended that the slope of the ladder be 75

. The slope can be measured with angle square or with arm, as shown in the Figure 3. When using the ladder, the wider end of the ladder should be placed against the ground or protective measures should be taken at the bottom of the ladder for the purpose of skid resistance. Place the ladder against a stable ground and do not place the ladder against those objects that are easy to lean and sli de themselves such as paper box, stone and so on.

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