Which of the following statements about the ODUk unit is TRUE?
A.
The ODUk contains the FEC.
B.
The ODUk is the basic payload that can be electronically groomed and switched in the OTN network.
C.
The ODUk is processed at an optical level.
D.
The ODUk is the first container in which the client signal is inserted.
The Answer Is:
B
This question includes an explanation.
Explanation:
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
In theOptical Transport Network (OTN)hierarchy, theODUk (Optical Data Unit of order k)is the fundamental unit for electronic grooming and switching. Unlike the OTUk layer, which is tied to a specific physical optical interface and includes theForward Error Correction (FEC), the ODUk layer is "path-oriented." This means that in a switched WDM system like the Nokia 1830 PSS-24x, the ODUk containers can be switched across a backplane from one line card to another without needing to deconstruct the entire optical signal.
To clarify the other options:Option Ais false because FEC is part of theOTUk(Transport Unit) layer.Option Cis false because ODUk processing is entirelyelectrical(O-E-O must occur to access the ODUk overhead).Option Dis false because theOPU (Optical Payload Unit)is actually the "first" container where the client signal is mapped; the ODUk then wraps around the OPU to add path-level monitoring and maintenance signals. Therefore, the ODUk acts as the "virtual container" that allows the network to manage services end-to-end across multiple optical spans.
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