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

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Questions # 1:

If a DCM is configured in a system, the input single-wavelength optical power of the DCM must be lower than or equal to ( ) dBm.

Options:

-4

-2

-1

-3

Answer

Explanation

To prevent non-linear effects within dispersion compensation modules, the single-wavelength input power must not exceed –4 dBm.

Questions # 2:

Which of the following tools are commonly used in WDM network commissioning? (Choose all that apply.)

Options:

Screwdriver

Multimeter

Optical power meter

Optical spectrum analyzer

Answer

B, C, D

Explanation

A multimeter is used to verify the equipment’s electrical power and grounding.

An optical power meter measures the received optical power levels on each wavelength.

An optical spectrum analyzer checks the wavelength spacing, channel power, and spectral purity during WDM commissioning.

Questions # 3:

The nominal rate of OTU4 signals is 111,809,973.568 kbit/s. Generally, the line rate is regarded as 112 Gbit/s.

Options:

TRUE

FALSE

Answer

Explanation

The nominal rate of OTU4 signals is precisely 111,809,973.568 kbit/s, which is generally rounded to 112 Gbit/s for practical purposes. This nominal rate corresponds to the standardized high-speed optical transport designed to support extremely high-capacity networks. The rounding simplifies communication and equipment specifications without losing significant accuracy. HCIP-Transmission references this value when discussing OTN signal rates and the design of optical transmission systems to handle next-generation bandwidth demands.

Questions # 4:

Match the site type with the corresponding function description.

Question # 4

Options:

Answer

Answer:

Questions # 5:

On a WDM network, if OA and OSC board in two directions report optical loss alarms, which of the following is the most likely cause?

Options:

Bidirectional line fiber deterioration

Unidirectional line fiber cut

Bidirectional line fiber cut

Unidirectional line fiber deterioration

Answer

Explanation

A break in the shared fiber link causes loss of optical power in both transmit and receive directions, triggering optical loss alarms on OA and OSC boards at both ends.

Questions # 6:

Which of the following are not features of WDM network expansion?

Options:

Increased network complexity

No impact on existing services during the expansion

Maximized protection of existing investment

It takes a long time.

Answer

A, D

Questions # 7:

Which of the following statements about trail deletion on the NMS is false?

Options:

If a path is deleted from the NE layer, the WDM paths at both the network layer and NE side are deleted.

Deleting a path at either the network or NE layer interrupts services.

If a path is deleted from the network layer, only the WDM path at the network layer is deleted on the NMS.

Deleting a path at the network layer does not interrupt services.

Answer

Explanation

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.

Questions # 8:

A common WDM service can be converted into an ODUk SNCP service. However, an ODUk SNCP service will be interrupted when it is converted into a common WDM service.

Options:

TRUE

FALSE

Answer

Explanation

A common WDM service can be converted into an ODUk SNCP (Subnetwork Connection Protection) service. However, when an ODUk SNCP service is converted back into a common WDM service, the protection is interrupted, causing service disruption. This is because SNCP provides path-level protection with automatic switching, which is lost during conversion back to a simpler WDM configuration. HCIP-Transmission highlights this limitation in protection mechanisms when migrating between service types, important for network planning and service continuity management.

Questions # 9:

Modulation is a process where the information of a signal source is processed and added to a carrier to make the information suitable for channel transmission. It is a technology where a carrier changes with a signal.

Options:

TRUE

FALSE

Answer

Questions # 10:

Which of the following is not a difference between MPLS-TP OAM and MPLS OAM?

Options:

Packet formats are different.

MPLS-TP OAM can save some label alarms, such as AIS, RD1, and UNEXPMEG.

The CC, AIS, LB, and LT functions are added to MPLS-TP OAM.

The interval for sending OAM packets Is changed, and the values 3.3 ms and 10 ms are canceled.

Answer

Explanation

Among the differences between MPLS-TP OAM and MPLS OAM, the interval for sending OAM packets is not changed by canceling 3.3 ms and 10 ms values (D). This means these intervals remain in place or are not the key differentiators. The other options (A, B, C) correctly describe differences such as packet formats, label alarms (AIS, RD1, UNEXPMEG), and added functions (CC, AIS, LB, LT) unique to MPLS-TP OAM. HCIP-Transmission materials clarify these differences to aid in understanding the enhanced OAM capabilities for transport profile MPLS networks.

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