Which of the following are not OTN protection types? (Multiple Choice)

Question

Options

• AMultiplex segment shared protection ring
• BODUkSNCP
• COptical line 1+1
• DODUkSPRing
• Eclient1+ 1
• FLinear multiplex section protection

• A
  81% (17)
• B
  5% (1)
• D
  10% (2)
• E
  5% (1)

Explanation

Options A and F use SDH/SONET terminology, not OTN. "Multiplex segment shared protection ring" is the SDH concept of MS-SPRing (also called BLSR), and "Linear multiplex section protection" is SDH's MSP - both belong to the multiplex section layer, which doesn't exist in OTN's layer model.

The distractors are all genuine OTN protection types defined in ITU-T G.873.x standards: ODUkSNCP (B) is sub-network connection protection at the ODU layer (G.873.1); Optical line 1+1 (C) provides protection at the OMS/optical line layer; ODUkSPRing (D) is the OTN ring protection equivalent of MS-SPRing (G.873.2); and Client 1+1 (E) protects at the client signal level before it enters the OTN wrapper. These four are OTN's own protection mechanisms, making them wrong answers to "which are NOT OTN types."

Memory tip: If you see the word "multiplex section" in a protection name, think SDH/SONET - OTN replaced that layer with the OTU/ODU hierarchy and renamed its protection schemes accordingly (SNCP, SPRing, optical line, client).

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