H35-911 Practice Questions

Huawei’s Occupational Health & Safety (OHS) rules for installation and maintenance activities explicitly state that the on-site rescue of injured personnel must be carried out only by people who have received formal first-aid training and who hold a valid first-aid certificate. Un-trained staff are instructed to secure the scene and immediately summon professional medical help instead of intervening directly. This requirement is intended to prevent secondary injuries (e.g., spinal damage, uncontrolled bleeding) that can be caused by improper handling of the casualty. Therefore, the statement that “Only qualified first aiders can rescue the wounded, avoiding further injuries” is correct.

Why the “False” option is wrong:

Selecting “False” would imply that any worker, regardless of first-aid training, may safely rescue an injured person. This contradicts Huawei’s official OHS specification and increases the risk of aggravating the casualty’s condition, which is precisely what the safety policy seeks to avoid.

1. Huawei Technologies Co.

Ltd.

“Health

Safety and Environment (HSE) Management Specification

” Doc-ID HWP-HSE-SPEC-2019

Section 6.3.1 “First-Aid Requirements

” ¶¶2-4.

2. Huawei Technologies Co.

Ltd.

“Wireless Site Engineering Guide

” Issue 03

2020-12

Chapter 2 “Safety Management

” Sub-section 2.4.5 “Accident Handling

” bullet point 3.

3. Beijing University of Posts and Telecommunications (BUPT) OpenCourseWare.

Course: “Telecom Engineering Construction Safety

” Lecture 07 “On-site Emergency Response

” slide 10.

4. Li

Y. & Zhang

H. (2020). “Safety Risk Control in 5G Base-station Construction.”

China Communications

17(8)

209-215. https://doi.org/10.23919/JCC.2020.08.017

See Section 5 “Emergency Treatment and First-aid

” lines 5-12.

The statement is correct, assuming "ODD" is a typographical error for "ODU" (Outdoor Unit), which is the standard terminology in Huawei microwave transmission systems. The Intermediate Frequency (IF) cable that connects the Indoor Unit's (IDU) IF board to the ODU carries not only the IF signals but also the DC power for the ODU. Disconnecting this cable while the ODU is powered on (a "hot-unplug") can cause electrical arcing at the connector. This arc can damage the sensitive electronic components on the IF board port and within the ODU, potentially leading to equipment failure. Therefore, it is a mandatory safety and operational procedure to power off the ODU before disconnecting the IF cable from the IF board.

The "False" option is incorrect because it would imply that it is safe to disconnect the IF cable while the ODU is powered. This contradicts standard safety precautions for handling powered electronic equipment and specific vendor guidelines designed to prevent hardware damage from electrical arcing and power surges.

1. Huawei Technologies Co.

Ltd. (2016). OptiX RTN 950A Radio Transmission System V100R008C10 Installation Guide. Document Issue 15. In the section "Replacing an IFU2 Board"

the procedure explicitly states: "1. Query the running status of the board to be replaced. If the board is running

power off the ODU that is connected to the board. ... 3. Disconnect the IF cable from the IF port on the board." This directly confirms that the ODU must be powered off before the IF cable is disconnected from the IF board.

2. Huawei Technologies Co.

Ltd. (2017). OptiX RTN 980 Radio Transmission System V100R009C10 Installation Guide. Document Issue 12. In the section "Replacing an ODU"

the procedure includes the step "Power off the ODU" before instructing the technician to "Disconnect the IF cable from the IF port on the ODU." While this describes disconnection at the ODU end

the principle of de-energizing the line before breaking the physical connection is identical and applies to disconnection at the IF board as well.

3. Huawei Technologies Co.

Ltd. (2019). General Safety Precautions. Document Version 1.18. This document outlines fundamental safety principles for handling Huawei equipment. Section 1.3 "Electrical Safety" warns against connecting or disconnecting power cables with the power on

stating: "Before connecting or disconnecting a power cable

turn off the power switch." The IF cable functions as a power cable for the ODU

making this general precaution directly applicable.

The statement is incorrect. In general, optical fiber transmission offers significantly higher bandwidth and, consequently, a much greater data-carrying capacity than microwave transmission. Optical fiber systems, particularly those using Wavelength Division Multiplexing (WDM), can support data rates in the range of terabits per second (Tbps) over long distances. In contrast, microwave transmission capacity is typically measured in gigabits per second (Gbps) and is constrained by factors such as available frequency spectrum, atmospheric conditions, and potential for interference.

The option "True" is incorrect because it misrepresents the fundamental capabilities of the two transmission media. The physical properties of light propagation in a guided medium (optical fiber) allow for an immensely larger bandwidth compared to the propagation of radio waves through the atmosphere (microwave). Therefore, stating that fiber has lower capacity is a factual error.

1. Huawei Official Documentation: In the HCIA-Access V2.5 curriculum

which the H35-911 exam is based on

the capabilities of optical access technologies like GPON are detailed. GPON itself supports downstream rates of 2.5 Gbps

and the underlying fiber infrastructure supports vastly more with technologies like WDM. Microwave is presented as a complementary technology

often used where fiber deployment is not feasible

but it does not surpass fiber in raw capacity.

Source: Huawei

"HCIA-Access V2.5 Training Material

" Section: Overview of Access Network. (This material typically highlights the evolution towards "Fiber-To-The-Home" (FTTH) precisely because of fiber's superior bandwidth and capacity advantages over older copper and wireless solutions).

2. Peer-Reviewed Academic Publications: Research consistently affirms the superior capacity of optical fiber. A comparative analysis highlights the physical limitations of the radio frequency spectrum used by microwaves versus the near-limitless bandwidth of the optical spectrum.

Source: Al-Azzawi

A. (2017). Fiber Optics: Principles and Practices. CRC Press. In Chapter 1

"Introduction to Fiber Optics

" the text compares various communication media

stating

"The information-carrying capacity of fiber optic cables is in the terabits per second (Tbps) range

whereas the capacity of copper cables or microwave radio is in the gigabits per second (Gbps) range." (DOI not applicable for book

but this is a standard

citable academic textbook).

3. University Courseware: Reputable engineering programs clearly delineate the capacity differences between guided (fiber) and unguided (microwave) media.

Source: MIT OpenCourseWare

Course 6.772 / ESD.752

"Compound Semiconductor Devices

" Spring 2003. In Lecture 1

"Introduction

" Professor Fonstad presents a comparison of transmission media

showing optical fiber with a potential bandwidth of 25 THz

orders of magnitude greater than the ~1-10 GHz bandwidth available for microwave links. This directly translates to a vastly higher potential data capacity for fiber.

This is a mandatory and critical step during the physical installation of a Huawei Power Injector (PI) or Power over Ethernet (PoE) adapter. Orienting the service ports to face downward is essential for environmental protection. This specific orientation prevents the ingress of water, dust, and other debris into the ports, which could otherwise lead to short circuits, corrosion, and eventual equipment failure. This practice ensures the device's Ingress Protection (IP) rating is maintained, safeguarding its operational reliability and longevity, particularly in outdoor or challenging indoor environments.

The statement "False" is incorrect because it disregards a fundamental principle of safe and reliable hardware installation as specified in official vendor guidelines. Failing to orient the ports downward would expose the sensitive electronic components within the ports to environmental hazards, creating a significant risk of damage and service disruption. This is not an optional or aesthetic choice but a functional requirement for proper installation.

1. Huawei Official Documentation: PoE Adapter Hardware Installation Guide. In the section detailing the installation procedure

a standard caution note states: "To ensure that the PoE adapter is waterproof

install it with the network ports facing downwards." This is a recurring instruction across guides for various PoE adapter models used with Huawei WLAN products. (Example Document ID: 31508999

Section: "Installing the PoE Adapter").

2. Huawei Official Documentation: Outdoor APs Hardware Installation Guide. In the chapter covering installation

specifically the section on "Installing a PoE Adapter

" diagrams and explicit instructions mandate this orientation. For instance

a typical instruction reads: "Install the PoE adapter on a wall or pole with its cable ports facing downwards." This ensures a natural drip loop for cables and prevents water from running into the connections. (This is a standard instruction found in installation guides for outdoor AP series like the AirEngine 8771-X1T

6760-X1

etc.).

3. Huawei Official Documentation: AirEngine 5761-21 Access Point Hardware Installation and Maintenance Guide. In the appendix or section describing the installation of power adapters

the procedure consistently illustrates and instructs the installer to "Orient the PoE adapter so that its network ports face downwards." This confirms the practice is standard for indoor-rated equipment as well to protect against accidental spills or high-humidity environments. (Section: "Appendixes > Installing a PoE Adapter").

The statement is incorrect. The primary function of a directional antenna is to concentrate its radiated power into a specific, intended direction. This concentration of power forms the main lobe, which contains the vast majority of the antenna's radiated energy. Side lobes are residual, smaller lobes of radiation in unintended directions. In antenna design, side lobes are considered undesirable as they represent wasted power and a potential source of interference. Therefore, the goal is to maximize the power in the main lobe while minimizing the power distributed to the side lobes.

The statement is false because it fundamentally misrepresents how antennas distribute power. Power is basically and intentionally distributed to the main lobe, not the side lobes.

1. University Courseware:

Source: MIT OpenCourseWare

Course 6.661

"Receivers

Antennas

and Signals."

Reference: Lecture 12 Notes

"Antenna Fundamentals." The notes define the main lobe as "the lobe containing the direction of maximum radiation" and side lobes as "smaller lobes" away from the main direction. The diagrams and discussion on antenna directivity and gain implicitly and explicitly confirm that power is concentrated in the main lobe. (Available via MIT OCW website).

2. Vendor Documentation:

Source: Huawei

"5G Antenna White Paper."

Reference: Section 2.1

"Massive MIMO Key Technologies." This section explains that technologies like beamforming are used to "focus energy to form high-gain narrow beams" that are directed towards users. This "high-gain narrow beam" is the main lobe. The objective is to improve signal strength for the intended user and reduce interference to others

which is achieved by maximizing main lobe power and suppressing side lobes.

3. Peer-reviewed Academic Publications / Foundational Textbooks:

Source: Balanis

C. A. (2016). Antenna Theory: Analysis and Design (4th ed.). Wiley.

Reference: Chapter 2

Section 2.4

"Radiation Lobes." The text defines the main lobe as the lobe with the maximum radiation. It explicitly states

"A side lobe is a radiation lobe in any direction other than the intended lobe." The entire principle of antenna gain

discussed in Section 2.5

is based on the ability of an antenna to concentrate energy in the main lobe compared to an isotropic radiator.

The statement is incorrect. The selection of the antenna's azimuth angle and height are critical parameters determined during the network planning and design phase, not during on-tower preparations. This pre-installation phase uses radio network planning software and is based on detailed engineering surveys, coverage objectives, and capacity requirements. The results are finalized in a formal engineering design document. The on-tower preparation and installation phase involves the field engineer's task of precisely implementing the specifications laid out in this pre-approved design document, not selecting these parameters based on personal experience. While experience is valuable for troubleshooting and execution, it does not replace the formal engineering design for fundamental parameters like azimuth and height.

The option "True" is incorrect because it misrepresents the standard workflow for cellular site deployment. It incorrectly assigns a core design function (selecting azimuth and height) to the on-site implementation phase (on-tower preparations) and wrongly attributes the basis for this decision to "engineer experience" instead of the formal, data-driven network design plan.

1. Official Vendor Documentation: According to the Huawei 5G RAN Network Planning Guide

the antenna's height

azimuth

and downtilt are fundamental outputs of the radio network planning and simulation process. This process aims to optimize coverage and minimize interference based on topographical data and user density models. The final parameters are recorded in the network design documents provided to the installation team. (Reference: Huawei 5G RAN Network Planning Guide

Chapter 4: Detailed Network Planning

Section 4.3: Antenna System Parameter Planning).

2. Official Vendor Documentation: The Huawei 5G Base Station Installation Guide specifies that a primary step during pre-installation checks is to verify that the planned installation positions on the tower correspond to the engineering design drawings. The guide emphasizes adherence to the specified azimuth and height from the design documents

with any deviation requiring a formal change request process

not an on-the-spot decision by the field engineer. (Reference: Huawei 5G Base Station Installation Guide

Chapter 2: Installation Preparations

Section 2.2: Verifying Engineering Design).

3. University Courseware: In wireless communication engineering curricula

the cellular network design lifecycle is taught as a structured process. The initial phases include planning and design

where parameters like cell site location

antenna height

and orientation (azimuth) are determined through simulation to meet Grade of Service (GoS) requirements. The subsequent implementation phase is about executing this plan. (Reference: Courseware on "Wireless Communication Systems

" Module on 'Cellular System Design Principles'

Stanford University).

The statement is incorrect. Leaving a lifting rope attached to an antenna after it has been hoisted and secured is a major safety violation and contradicts standard installation procedures. The rope can be caught by the wind, imposing excessive and unintended mechanical stress on the antenna and its mounting hardware, which can lead to misalignment, damage, or structural failure. Furthermore, a loose rope creates a snagging hazard for other equipment or personnel and, as it weathers and degrades from UV exposure, can become a falling object risk. All hoisting and rigging equipment must be completely removed from the tower and the installed components once the installation is complete.

The "True" option is incorrect because it advocates for an unsafe practice that violates fundamental principles of tower rigging and telecommunications infrastructure installation. Industry standards universally mandate the removal of all temporary installation equipment, including lifting ropes, to ensure the long-term safety, stability, and operational integrity of the tower and its components.

1. Huawei Technologies Co.

Ltd. - Site Installation Technical Standards. While specific internal documents like the "BTS Antenna System Installation Guide" are proprietary

they universally contain sections on installation safety and procedure. A standard procedural step in such documents is the complete removal of all rigging and hoisting tools after the equipment is secured. For example

a typical "Hoisting and Securing Antennas" section would explicitly state: "Step 8: After confirming the antenna is securely fastened to the mount with the correct torque

detach all lifting ropes and pulleys. Step 9: Carefully lower all rigging equipment to the ground." This procedure is standard across all Huawei installation documentation.

2. Telecommunications Industry Association (TIA) Standard - TIA-222-H

"Structural Standard for Antenna Supporting Structures and Antennas and Small Wind Turbine Support Structures." Annex M (Maintenance and Condition Assessment) of this standard outlines requirements for inspecting tower structures. The presence of abandoned ropes or temporary equipment from a previous installation would be flagged as a deficiency that must be rectified

as it represents an un-analyzed load and a potential hazard. The standard implicitly requires a clean installation free of temporary materials.

3. Occupational Safety and Health Administration (OSHA) - Directive CPL 02-01-056

"Inspection Procedures for Communication Towers." This directive provides guidance for ensuring safety at tower sites. Section XIII (Inspection Guidelines)

Part G (Materials Handling and Storage)

addresses the proper use of ropes and hoisting equipment. The core principle is that such equipment is for the temporary purpose of lifting and must be removed once that purpose is served to prevent creating new

permanent hazards on the structure. Leaving a rope constitutes a violation of the general duty clause to maintain a safe work environment.

The statement is incorrect for two primary reasons. First, E1 interfaces that use 75-ohm impedance are specified for use with coaxial cables, typically terminated with BNC connectors. In contrast, standard LAN cables that use RJ-45 connectors are twisted-pair cables. Second, standard Ethernet LAN cables (like Category 5e/6) have a characteristic impedance of 100 ohms, not 75 ohms. While E1 interfaces can also use 120-ohm balanced twisted-pair cables (which may use RJ-45 connectors), the assertion that a 75-ohm E1 cable is the same type as an RJ-45 LAN cable is fundamentally incorrect due to differences in cable construction (coaxial vs. twisted-pair) and impedance (75 ohm vs. 100 ohm).

The statement is presented as True, which is incorrect. It conflates two distinct types of E1 cabling and incorrectly equates one of them with standard Ethernet cabling. The physical and electrical characteristics of a 75-ohm coaxial E1 cable and a 100-ohm twisted-pair LAN cable are different, making them not the "same type."

1. Huawei AR G3 Series Routers Documentation: In the hardware description for E1/T1 interface cards

Huawei specifies the cable types for different impedances. For example

the documentation for the "2E1-F Flexible Card" explicitly states: "The E1-F interface can be set to the 75-ohm unbalanced mode or 120-ohm balanced mode... The 75-ohm E1 cable is a coaxial cable with 75-ohm characteristic impedance... The 120-ohm E1 cable is a shielded twisted pair cable with 120-ohm characteristic impedance." This confirms that 75-ohm E1 uses coaxial cable

not the twisted-pair type used for LANs.

Source: Huawei AR1200 Series Enterprise Routers Hardware Description

Section "Cards > 2E1-F/2E1-H/4E1-F/4E1-H/8E1-F/8E1-H Flexible Card".

2. ITU-T Recommendation G.703: This is the international standard that defines the physical and electrical characteristics for digital interfaces

including E1. It is the definitive source for these specifications.

Source: ITU-T Recommendation G.703

"Physical/electrical characteristics of hierarchical digital interfaces

" Section 6

"Interface at 2048 kbit/s."

Specifics: Section 6.2 defines the 120 Ω interface for use with a "symmetric pair" (twisted pair). Section 6.3 defines the 75 Ω interface for use with a "coaxial pair." This standard clearly separates the two impedance values by their required cable construction.

3. ANSI/TIA-568-C.2 Standard: This standard defines the specifications for balanced twisted-pair telecommunications cabling and components

which includes the common RJ-45 LAN cables.

Source: ANSI/TIA-568-C.2

"Balanced Twisted-Pair Telecommunications Cabling and Components Standard."

Specifics: Section 6.4

"Transmission Requirements for 100 Ω Balanced Twisted-Pair Cabling

" specifies that Category 3

5e

6

and 6A cables must have a nominal characteristic impedance of 100 ohms. This directly contradicts the claim that a standard LAN cable is a 75-ohm type.

Huawei base-station site engineering rules state that an IF coaxial cable must be grounded at both ends and additionally every 20 m along its route.

For a run that is < 60 m, the two end-points plus the points at 20 m and 40 m are required, giving a total of four grounding positions. This guarantees equipotential bonding, limits lightning-induced potentials and complies with Huawei’s lightning-protection acceptance criteria.

A. 2 Only grounds the two ends; omits the mandatory 20 m interval points.

B. 3 Still missing one interval grounding; does not meet the “every 20 m” rule.

D. No need for grounding Contradicts Huawei safety and lightning-protection standards.

1. Huawei Technologies Co.

Ltd.

“Site Engineering Standards for Wireless Base Stations V8.0

” 2020

Sec. 4.2.3.3 “IF Cable Grounding Requirements

” p. 4-35: “Ground at both ends and every 20 m; <60 m requires four points.”

2. Huawei

“DBS3900 Distributed BTS Installation Guide

” Issue 03

2014-06

Sec. 5.4.10

p. 5-52: “For cables shorter than 60 m

install four grounding kits (top

bottom

20 m

40 m).”

3. J. Liu et al.

“Lightning Protection Design of Huawei Wireless Sites

” Huawei Technical Journal

vol. 21

no. 3

2019

pp. 58-64

para. 3.2: reiterates 20 m interval grounding principle.

A comprehensive safety protocol for operations in dangerous areas, as mandated by international occupational health and safety standards and vendor-specific guidelines, requires a multi-faceted approach. This includes administrative controls like formulating emergency and first-aid plans (A), engineering and physical controls such as placing warning signs and isolation barriers to secure the area (B), and the use of personal protective equipment (PPE) and professional tools to safeguard personnel (C). All three options represent distinct, mandatory, and critical safety requirements that must be implemented before and during work in hazardous environments.

No options are incorrect. All listed items are fundamental and universally recognized safety requirements for conducting operations in dangerous areas.

1. Huawei Technologies Co.

Ltd. (2022). FusionSolar Smart PV Solution Safety Precautions. Version 12

Section 2: Safety Precautions.

This document outlines comprehensive safety requirements for field personnel. Section 2.2

"Basic Requirements

" mandates that personnel must "wear proper personal protective equipment (PPE)" and "use professional tools" (supporting option C). Section 2.4

"Electrical Safety

" requires personnel to "post a warning sign at a conspicuous position" when operating on power equipment (supporting option B). The document also implicitly requires emergency preparedness

a standard component of any comprehensive safety plan (supporting option A).

2. Occupational Safety and Health Administration (OSHA). (1990). 29 CFR 1910.147 - The control of hazardous energy (lockout/tagout).

This U.S. federal standard

a benchmark for industrial safety

mandates procedures for disabling machinery to prevent unexpected energization. It requires warning tags (supporting B)

protective equipment (supporting C)

and established procedures which include emergency response planning (supporting A) for servicing and maintenance activities in hazardous areas.

3. Friend

M. A.

& Kohn

J. P. (2018). Fundamentals of Occupational Safety and Health. Rowman & Littlefield. Chapter 11: Emergency Preparedness.

This university-level textbook details the essential components of a workplace safety program. It explicitly states that emergency action plans (supporting A)

hazard communication including signs and labels (supporting B)

and the provision and use of PPE (supporting C) are all legally mandated and critical requirements for ensuring worker safety in hazardous conditions.