Which of the following sentence about FlexGrid is false?

FlexGrid allows a more efficient channel spacing.
Channels in FlexGrid systems are allocated with a granularity of 27.5 GHz.
FlexGrid systems use specific sets of boards. Old generation WDM systems need to be upgraded to support FlexGrid.
The FlexGrid is currently standardized by ITU-T.

Answer(s): C

What is the function of a pre-amplifier in an optical network?

Through the pre-amplifier, the optical signal is amplified at the receiver side after it travels along the fiber from another node.
Through the pre-amplifier, the optical signal is amplified at the transmitter side before it is sent to the line span.
Through the pre-amplifier, the optical signal is amplified both the receiver side and at me transmitter side.
Through the pre-amplifier, the optical signal is amplified within the node internally to recover internal losses due, for instance, to cascaded filters.

Answer(s): C

What is a degree-1 node?

Answer(s): A

With reference to trails and services, which of the following sentences is correct?

Trails are transported over services; that is, trails are clients with respect to services.
A trail can interconnect three ports, while a service always two.
Services are transported over trails; that is, services are clients with respect to trails.
A service is always associated to a single wavelength, while a trail can involve multiple wavelengths.

Answer(s): C

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