Learn which statement is true about the ODUk unit in OTN networks. Understand the role of ODUk as a payload in electronic grooming and switching in the OTN network.
Table of Contents
Question
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.
Answer
B. The ODUk is the basic payload that can be electronically groomed and switched in the OTN network.
Explanation
ODUk (Optical Data Unit-k) is an essential element in Optical Transport Network (OTN) technology, acting as a payload container for client signals. Here’s why option B is correct:
ODUk as the Basic Payload:
The ODUk is responsible for carrying the client signal in the OTN. It is designed to be electronically groomed and switched, which means it can be manipulated at an electrical level to optimize network traffic. This process of grooming allows for more efficient bandwidth utilization by aggregating multiple smaller signals into one larger signal or distributing a large signal into smaller parts across different network paths.
Clarifying the Incorrect Options:
- Option A (FEC): ODUk does not contain Forward Error Correction (FEC). FEC is applied at the Optical Transport Unit (OTUk) layer, not at the ODUk level. OTUk provides additional overhead for functions such as FEC and fault management.
- Option C (Optical Level Processing): The ODUk is not processed at the optical layer. Instead, it operates at the digital layer, where it can be electronically switched. The optical layer (where signals are handled as light waves) is managed by the OTUk.
- Option D (First Container): The ODUk is not the first container for the client signal. The client signal is first mapped into the OPUk (Optical Payload Unit-k), which is then encapsulated into the ODUk. Therefore, OPUk is the initial container for the client signal.
In summary, ODUk plays a crucial role in electronically managing and switching traffic within the OTN, making B the correct answer.
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