Huawei HCSA-Presales-Transmission & Access H19-315 Exam Questions

Answer : A, B, C, D

Wavelength Division Multiplexing (WDM) systems use different types of sites to manage signal transmission and amplification across long distances. These include:

OLA (Optical Line Amplifier):Amplifies optical signals to compensate for losses over long distances.

OTM (Optical Terminal Multiplexer):Located at the endpoints of the WDM system, it multiplexes and demultiplexes wavelengths.

REG (Regenerator):Regenerates optical signals to restore their quality after significant attenuation.

OADM (Optical Add-Drop Multiplexer):Adds or drops specific wavelengths at intermediate points without affecting others.

Each type of site plays a critical role in ensuring efficient and reliable operation of WDM networks.

ITU-T G.694 Standard - WDM Architecture

Huawei WDM Solution Guide

Answer : D

Type B Protectionin GPON networks refers to link-layer redundancy, where two independent fiber paths are used to connect an ONU to the OLT. In the event of a fiber failure, the system automatically switches to the backup path.

Theminimum protection switching timefor Type B protection is50 ms, ensuring minimal disruption to services. This rapid switching time is critical for maintaining high availability and reliability in mission-critical applications.

ITU-T G.984 Standard - GPON Protection Mechanisms

Huawei GPON Technical Documentation

Answer : B

GPON (Gigabit Passive Optical Network) does not use AES-128 encryption for downstream traffic. Instead, GPON uses AES-128 encryptiononly for upstream trafficto ensure data security between the Optical Network Unit (ONU) and the Optical Line Terminal (OLT). Downstream traffic in GPON is broadcasted to all ONUs, and encryption is not applied because the data is intended for multiple users. The encryption key is dynamically managed by the OLT and distributed securely to the ONUs.

This behavior is defined in theITU-T G.984 standard, which specifies the GPON architecture and security mechanisms. For downstream traffic, the security relies on higher-layer protocols (e.g., IPsec or application-level encryption).

ITU-T G.984 Standard - GPON Architecture and Security

Huawei GPON Technical Documentation

Answer : B

TheOptiXtrans product familyprimarily includes advanced optical transport platforms such as theE9600 series, which is designed for high-capacity and long-haul networks. However, theOSN 1800,DC908, andE5800are part of different product lines:

OSN 1800:Belongs to Huawei's MS-OTN (Multi-Service Optical Transport Network) portfolio, targeting metro and regional networks.

DC908:A data center interconnect (DCI) solution optimized for short-reach, high-capacity links between data centers.

E5800:Not a recognized product in Huawei's optical transport portfolio.

Thus, the statement is incorrect because not all the listed products belong to the OptiXtrans family.

Huawei OptiXtrans Product Portfolio

Huawei Optical Transport Network Solution Guide

Answer : A

TheOptiXtrans DC908is a high-performance data center interconnect (DCI) solution that supports400GE (Gigabit Ethernet)services. This capability is critical for modern data centers requiring ultra-high-speed connectivity for applications like cloud computing, big data analytics, and artificial intelligence.

Key details:

400GE Support:The DC908 uses advanced line cards (e.g., MD02A) to provide native 400GE interfaces.

High Capacity:With support for up to 800G per wavelength, the DC908 ensures sufficient bandwidth for 400GE traffic.

Low Latency:Optimized for minimal delays, ensuring seamless performance for latency-sensitive applications.

Thus, the statement is correct.

Huawei OptiXtrans DC908 Product Datasheet

Huawei 400GE Service Deployment Guide

Answer : B

TheOptiXtrans E9624is a high-end optical transport platform designed for core networks. Itsmaximum cross-connect capacity is 24 Tbps per subrack, not 2.4 Tbps as stated in the question. This makes it one of the most powerful systems in Huawei's optical transport portfolio, capable of handling massive traffic volumes in backbone and metro-core networks.

The confusion may arise from other models in the series, such as the OptiXtrans E9605, which has a lower capacity. However, the E9624 is specifically engineered for ultra-high-capacity scenarios.

Huawei OptiXtrans E9624 Product Datasheet

Huawei Optical Transport Network Solution Guide

Answer : B, D

Deploying networks inremote areaspresents unique challenges, such as limited infrastructure, harsh environmental conditions, and high costs. To address these challenges, Huawei proposes the following solutions:

Outdoor Site Cabinet for OLT:Compact and ruggedized cabinets house the OLT and associated equipment, enabling deployment in outdoor environments without the need for dedicated indoor spaces.

Class D Optical Module:These modules are designed for long-distance transmission (up to 20 km), making them ideal for connecting remote areas to the central OLT.

WhileFlex-PONandCombo PONare innovative technologies, they are more focused on optimizing network capacity and efficiency rather than addressing the specific challenges of remote deployments.

Huawei Remote Area Deployment Guide

Huawei OLT Outdoor Cabinet Specifications