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

An advantage that is not true about OTN (Optical Transport Network) is that it provides a maximum of five levels of nested or overlapped TCM (Trail Connection Monitoring) connection monitoring (C). In reality, OTN provides powerful out-of-band FEC (Forward Error Correction), wide service interface support (from 2 Mbit/s to 400 Gbit/s), and meets the Tbit/s bandwidth requirements using WDM, but TCM monitoring is more limited. HCIP-Transmission clarifies that OTN’s strengths lie in scalability, error correction, and flexible service mapping, rather than extensive nested TCM levels.

Static LAGs use manual configuration and do not require LACP; LACP is only needed for dynamic link aggregation groups.

All listed statements are disadvantages of FOADM compared to ROADM: it requires site visits for capacity or service changes, has poor wavelength flexibility due to fixed allocation, demands manual power budget adjustments onsite during expansion, and cannot provision wavelength services rapidly.

In an OA (Optical Amplifier) system, the lower threshold of the receive optical power for a line board with a PIN receiver or the WDM side of an OTU board is typically the optical module’s receiver sensitivity plus 3 dB, not 5 dB. Adding 3 dB accounts for margin to ensure reliable reception without unnecessary overdesign. The 5 dB margin usually applies when an APD receiver is used, which is more sensitive but also more susceptible to noise. Thus, for PIN receivers, HCIP-Transmission guidelines specify the lower threshold as sensitivity plus 3 dB to maintain signal quality while preventing false alarms or unnecessary protection switching.

Avalanche photodiode (APD) receivers are commonly used on OTU boards due to their high sensitivity. The input optical power range typically lies between -4 dBm (maximum) and around -28 dBm (minimum). Among the options, -4 dBm is within the acceptable input power range, ensuring the APD operates without saturation or damage. Optical powers too high can saturate the receiver, while too low powers cause poor signal-to-noise ratio. HCIP-Transmission specifies these ranges to ensure optimal receiver performance and avoid optical overload or underpower conditions.