H31-341_V2.5 Exam Dumps - Huawei HCIP Transmission Questions and Answers

Deleting a path at the NE or network layer on the NMS does not itself interrupt service; the NMS operation is purely administrative and does not tear down traffic forwarding.

QPSK (Quadrature Phase Shift Keying) modulation is a widely used modulation technique in advanced optical transmission systems. It offers several key benefits for long-haul and high-capacity networks. QPSK reduces the required Optical Signal-to-Noise Ratio (OSNR), which improves system performance under noisy conditions. It also mitigates fiber nonlinear effects because the signal changes are more gradual compared to higher-level modulations. Moreover, QPSK improves tolerance to chromatic dispersion and Polarization Mode Dispersion (PMD), two major impairments in fiber optics. These improvements lead to better signal integrity over longer distances and support higher data rates with fewer errors, making QPSK favorable in HCIP-Transmission environments where robust, high-capacity transmission is essential.

In OA-free systems, where no optical amplifiers are used, the lower threshold of the receive optical power of a line board or the WDM side of an OTU board is indeed the optical module’s receiver sensitivity plus 3 dB. This ensures a safety margin for stable signal reception and alarm triggering. Without optical amplifiers, signal levels are more susceptible to attenuation, so maintaining this margin helps prevent degradation due to low optical power. HCIP-Transmission highlights this threshold as a standard parameter for optical power management in non-amplified systems.

It is false that output optical power of a site must be as high as possible to ensure signals reach the peer site. Excessively high output power can cause nonlinear effects, such as four-wave mixing and self-phase modulation, degrading signal quality. Optimal power levels must be maintained within equipment specifications to balance reach and signal integrity. HCIP-Transmission stresses careful power management, including gain control and attenuation, to maximize network performance without introducing impairments.

The term “Directioned” in WDM systems means that the wavelength carrying local services can be transmitted in a specific direction. This contrasts with directionless systems, where wavelengths can propagate in either direction without restriction. Directioned capability allows more controlled and secure wavelength routing, especially in ring or mesh networks where traffic flows need clear paths. Colorless refers to wavelength independence (a device can handle any wavelength), while colored means the device or port is assigned to a fixed wavelength. Thus, directioned accurately describes the wavelength propagation direction property as per HCIP-Transmission explanations on optical network design and wavelength routing.

The OptiXtrans E6600 and OptiX OSN 1800 series use a hierarchical system architecture divided into three layers: L0 (optical layer), L1 (multiplexing layer), and L2 (service layer). According to HCIP-Transmission documentation, the E6608T/E6616 and OptiX OSN 1800 II TP/OSN 1800 V Pro models implement the L0+L1+L2 architecture, providing comprehensive functionality across optical signal management, multiplexing, and client service handling. This architecture enables scalable, flexible, and efficient transmission systems supporting various services and network demands. Other options mention partial model sets or incorrect combinations, making option B the accurate statement reflecting the system architecture.

In ROADM terminology, a “colored” port is tied to a specific wavelength and cannot be tuned, so “colored” refers to fixed wavelength.

When light passes through a passive optical component, the decrease in optical power is termed insertion loss. This is a fundamental concept in optical transmission where every component like connectors, splices, splitters, or filters adds some level of power attenuation. Managing insertion loss is crucial to maintain overall system performance, especially in long-haul or dense WDM systems where accumulated loss can degrade the signal. HCIP-Transmission emphasizes the importance of measuring and minimizing insertion loss to ensure system stability and reach requirements are met.

When using the loopback method for troubleshooting or testing, the objects to be looped back or replaced can include optical fibers, boards, fiber adapters, optical attenuators, or power supply devices. Loopback tests help isolate faults by looping signals back to the source or intermediate points, enabling precise fault location. HCIP-Transmission explains that loopback can be applied at various points within the transmission system to verify signal integrity and component function, making it a versatile diagnostic tool in optical networks.

A TTI mismatch in the PM layer generates TTI and TIM alarms but does not constitute a loss of frame alignment, so ODUk_PM_LOF is not reported.