Free H31-341-V2-5 sample questions

Correct answer: 1GbE -> GMP -> OPU0 -> ODU0 -> ODU1 -> OTU1

The correct mapping path for a 1GbE (Gigabit Ethernet) signal involves several steps. First, the asynchronous 1GbE signal is mapped into an ODU0 container using Generic Mapping Procedure (GMP), which is suitable for packet-based services. The ODU0 is then multiplexed into a higher-order ODU, such as an ODU1, for transport. The complete path is: Client Signal (1GbE) -> Mapping (GMP) -> OPU0 -> ODU0 -> Multiplexing -> ODU1 -> OTU1. BMP is used for constant bit rate services. Mapping directly into OPU1 is inefficient. There is no direct mapping to OTU0 for this service type.

Correct answer: False

This statement is false. The primary purpose of Tandem Connection Monitoring (TCM) is to monitor the quality of a specific segment or 'tandem connection' within an end-to-end OTN path. There are up to six levels of TCM, allowing different operators or network segments to be monitored independently. This means TCM can be enabled and monitored at intermediate points, not just the final path-terminating equipment, providing granular fault localization.

Correct answers: Performing an OTDR test on the fiber optic cables.; Measuring and adjusting the optical power of the multiplexed signal at the OA input.; Verifying the OSNR for each optical channel at the receiving end.

Correct answer: A reconfigurable optical add/drop multiplexer (ROADM) board based on Wavelength Selective Switch (WSS) technology.

For complex mesh topologies requiring flexible wavelength grooming and multi-degree connections, a ROADM board is essential. ROADMs, particularly those using WSS technology, allow for remote configuration of which wavelengths are added, dropped, or passed through a node, and to which degree (direction) they are routed. This is critical for building scalable and resilient core networks with the OptiXtrans E9624. FOADMs are static and not suitable for dynamic mesh networks. OAs amplify signals, and transponders handle O/E/O conversion; neither provides wavelength routing functionality.

Correct answer: The OSC board at the remote end of the link is faulty or powered down.

The OSC operates on a separate, dedicated wavelength (typically 1510 nm or 1490 nm) from the main service C-band wavelengths. It is used for management and supervision between adjacent sites. Since the main services are unaffected, a major fiber cut or main amplifier failure is unlikely. The `R_LOS` alarm on the OSC board specifically indicates that it is not receiving the OSC signal from the remote site. The most direct cause for this is a failure of the transmitting OSC unit at the far end, either due to a board fault or a power issue at that specific site.

Correct answer: The E9600 is designed for carrier backbone and metro core networks, while the DC908 is purpose-built for Data Center Interconnect (DCI) scenarios.

This statement correctly identifies the product positioning. The OptiXtrans E9600 series are large-capacity, carrier-grade platforms intended for national backbones, regional, and metro core networks, featuring extensive grooming and protection capabilities. The OptiXtrans DC908, in contrast, is specifically optimized for DCI applications, emphasizing high integration, large bandwidth, simplified management, and fast deployment to connect data centers.

Correct answer: The protection scheme is set to Non-revertive mode.

The described behavior is characteristic of a protection group configured in Non-revertive mode. In this mode, once the service switches to the protection path due to a fault, it remains on that path even after the fault on the working path is cleared. To achieve automatic switchback, the protection group must be configured in Revertive mode. In revertive mode, a Wait-to-Restore (WTR) timer is started after the working path is restored. Once the WTR timer expires, the service switches back from the protection path to the working path. Hold-off time is used to prevent switching during intermittent faults, and switching priority is for managing multiple protection events, neither of which controls the return to the primary path.

Correct answer: It transfers optical power from shorter-wavelength channels to longer-wavelength channels, causing tilt in the optical spectrum.

Stimulated Raman Scattering (SRS) is an inelastic scattering process where photons from shorter-wavelength (higher-frequency) channels act as a pump for longer-wavelength (lower-frequency) channels. This results in an energy transfer, amplifying the longer wavelengths at the expense of the shorter ones. In a multi-wavelength WDM system, this leads to a power tilt across the spectrum, where shorter wavelength channels are attenuated and longer ones are amplified, potentially degrading the OSNR of the shorter wavelength channels.

Correct answer: Client Signal -> OTN Mapping/Multiplexing -> FEC Encoding -> WDM-side Optical Module

The correct signal processing flow on a universal line board is as follows: The client signal is first received by the client-side optical module. It is then passed to the OTN processing unit, where it is mapped into an ODU container and potentially multiplexed with other ODU signals into a higher-order ODU. Next, the signal goes to the FEC (Forward Error Correction) module for encoding to improve transmission robustness. Finally, the encoded signal is sent to the WDM-side optical module for transmission onto the fiber.

Correct answer: The equipment must be configured with redundant System Control, Clock, and Communication (SCC) units.

An in-service software upgrade relies on having redundant main control units. The process involves upgrading the standby SCC unit first while the active unit continues to forward traffic. Once the standby unit is upgraded and verified, a switchover occurs, making the newly upgraded unit active. The formerly active unit is then upgraded. This 1+1 redundancy of the main control board is the fundamental hardware requirement that enables the software to be upgraded without interrupting service.