Pass the Huawei HCIP Transmission H31-341_V2.5 Questions and answers with ValidTests

The fiber type described, having zero dispersion at 1310 nm and a typical dispersion coefficient of about 17 ps/(nm·km) at 1550 nm, corresponds to ITU-T G.652 standard fiber, commonly called standard single-mode fiber (SSMF). G.652 fibers are widely used in optical networks due to their low attenuation and favorable dispersion characteristics around 1310 nm, where chromatic dispersion is minimal (essentially zero). This makes them suitable for legacy systems and many current applications. In contrast, G.654 is optimized for low loss and dispersion in the 1550 nm window; G.655 fibers have non-zero dispersion-shifted characteristics; G.653 fibers have zero dispersion around 1550 nm, which differs from the question’s description. HCIP-Transmission standards specify G.652 as the standard fiber matching these parameters.

A single channel reporting the BEFFEC_EXC (Bit Error Forward Error Correction Excess) alarm can be caused by (D) the input optical power of an OTU board being too high or too low. Both extremes can degrade signal quality, causing excessive bit errors. Other causes such as signal attenuation, external environment issues, or faulty optical amplifiers can also impact performance but are less directly linked to BEFFEC_EXC alarms. HCIP-Transmission stresses maintaining proper optical power levels and equipment health to avoid such errors and ensure service quality.

The core component of a ROADM (Reconfigurable Optical Add-Drop Multiplexer) is indeed the Wavelength Selective Switch (WSS). The WSS enables dynamic selection and routing of optical wavelengths without converting them to electrical signals. It provides the flexibility to add, drop, or pass through wavelengths, allowing on-demand network reconfiguration. This capability supports agile wavelength management, crucial for modern elastic and automated optical networks. HCIP-Transmission documents emphasize that the WSS is the essential element that makes ROADMs programmable and adaptive, forming the backbone of flexible optical layer management.

The RDU9 board is used for demultiplexing optical signals; however, it cannot dynamically demultiplex any wavelength to any port. Dynamic demultiplexing requires advanced ROADMs or wavelength selective switches capable of flexible mapping. The RDU9 has limited fixed demultiplexing functions and does not support arbitrary wavelength-to-port assignments. Therefore, the statement that it can dynamically demultiplex any wavelength to any port is false. This aligns with HCIP-Transmission technical references highlighting the capabilities and limitations of different demultiplexing hardware modules.

The OTUk_LOM (Loss of Multiframe) alarm indicates a framing alignment issue and is generated when the Out Of Multiframe (OOM) state persists for at least 3 milliseconds. This rapid alarm triggering helps detect synchronization failures quickly, allowing prompt response to maintain network stability. HCIP-Transmission details this alarm behavior within OTN frame monitoring functions, highlighting the critical role of frame alignment in maintaining signal integrity across optical networks.

When a GE (Gigabit Ethernet) service is encapsulated into an OTN frame or an SDH frame structure, the client-side alarms reported are not different; they are consistent regardless of the encapsulation method. This consistency ensures reliable fault detection and service monitoring across different transport technologies. HCIP-Transmission specifies that client alarms depend on service and interface definitions rather than the underlying framing, ensuring seamless interoperability and troubleshooting in multi-protocol environments.

ROADM networking has several key characteristics. (B) Existing services are not affected while the network is being upgraded because ROADMs support in-service wavelength reconfiguration, allowing maintenance and upgrades without service interruption. (C) The power equalization function enables channel-level power equalization, which balances the optical power of each wavelength to ensure signal quality and stability. However, (A) While network maintenance efficiency is improved with ROADM, it is not guaranteed that wavelengths can always be efficiently modified without cost implications, and (D) network construction costs are generally higher due to advanced hardware requirements. HCIP-Transmission highlights these features to showcase ROADM’s role in flexible, resilient optical networking with minimal disruption.

To implement segmented ODUk SNCP (Subnetwork Connection Protection) in a scenario where a service traverses two tangent WDM rings sharing an electrical subrack, protection scheme SNC/S must be configured. This scheme ensures that each ring can protect the service independently from one fault. Other options either do not provide segmented protection or do not fit the topology described. HCIP-Transmission highlights these protection configurations to support fault isolation and resilience in complex WDM ring architectures.