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H31-341_V2.5
HCIP-Transmission V2.5 Questions and Answers

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Questions # 21:

Which of the following features is used by a laser to coherently receive optical signals and restore the amplitude, phase, and state of polarization information from the received signals?

Options:

Same oscillation direction

Same amplitude

Opposite oscillation directions

Same frequency

Answer

Questions # 22:

If the intermediate flatness method is used, the objective of single-wavelength optical power adjustment at the transmit and receive ends is to ensure that the flatness of the single-wavelength input optical power is within the range of the nominal single-wavelength input optical power ( ).

Options:

±2 dB

±3 dB

±4dB

±1 dB

Answer

Explanation

The intermediate flatness method targets maintaining the single-wavelength input optical power within ±2 dB of the nominal value to ensure balanced power distribution and optimal system performance.

Questions # 23:

When LCK is inserted at the local ODUk PM overhead, how does the downstream site process the insertion?

Options:

Inserts the ODUk_PM_LCK alarm back to the upstream site.

Inserts the ODUk_PM_BDI alarm back to the upstream site.

Continues to transparently transmit the ODUk_PM_LCK alarm to the downstream site.

Reports the ODUk_PM_LCK alarm.

Answer

Explanation

An inserted ODUk_PM_LCK overhead is transparently forwarded downstream rather than reported or converted into another alarm.

Questions # 24:

When configuring electrical cross-connections for a TMK1TDC board, you must configure intra-board cross-connections.

Options:

TRUE

FALSE

Answer

Explanation

For the TMK1TDC board, intra-board electrical cross-connections must be configured to properly route signals within the board for correct service processing.

Questions # 25:

After a device is powered on, what need to be checked on subrack fans? (Choose all that apply.)

Options:

The PWR indicator on the subrack is steady on.

The FAN indicator on the fan tray assembly is steady green.

The fans have been started.

The airflows through the upper and lower parts of the subrack.

Answer

B, C, D

Explanation

After powering on, ensure the fan tray’s FAN indicator shows steady green (normal operation), fans are spinning properly, and airflow through both upper and lower parts of the subrack is unobstructed to maintain adequate cooling.

Questions # 26:

What are characteristics of ROADM networking?

Options:

During network maintenance, wavelengths can be efficiently modified, reducing maintenance costs.

Existing services are not affected while they are being upgraded.

The power equalization function enables channel-level power equalization.

Network construction costs are low.

Answer

B, C

Explanation

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.

Questions # 27:

Which of the following causes a single channel to report the BEFFEC_EXC alarm?

Options:

Signals are severely attenuated during line transmission.

The external environment is abnormal.

An optical amplifier board is faulty.

The input optical power of an OTU board is too high or too low.

Answer

Explanation

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.

Questions # 28:

Signal flow analysis is used to check the service flow of a faulty WDM system node by node to locate the fault.

Options:

TRUE

FALSE

Answer

Explanation

Signal flow analysis is a diagnostic method used to check the service flow through a faulty WDM system node by node, aiding in fault localization. By analyzing the signal path stepwise, engineers can identify where faults or performance degradation occur within the network elements. HCIP-Transmission materials highlight this technique as vital for efficient troubleshooting in complex optical networks, enabling fast restoration and minimal service impact.

Questions # 29:

The OptiXtrans DC908 chassis can be a DC chassis or an AC chassis.

Options:

TRUE

FALSE

Answer

Explanation

The OptiXtrans DC908 chassis supports both DC and AC power supply configurations, allowing it to operate as either a DC chassis or an AC chassis.

Questions # 30:

The OTUk_LOM alarm is generated when the out of multiframe (OOM) state lasts for 3 ms.

Options:

TRUE

False

Answer

Explanation

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.

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