What are the types of protection for WDM? (Multiple Choice)

Question

Options

• AClient side 1+1A
• BDevice level 1+1
• CODUkSNCP
• DLine side 1+1
• E1+1 on the board

• A
  100% (36)

Explanation

All five options represent valid, distinct protection mechanisms that WDM systems can employ across different layers and levels of the network. Client side 1+1A protects the signal at the ingress/egress client interface, while Line side 1+1 protects the optical transport path between nodes - together they cover the two ends of the optical connection. ODUkSNCP (ODU Sub-Network Connection Protection) is an ITU-T OTN standard providing protocol-layer 1+1 path protection at the ODU level, making it layer-aware and standardized. Device level 1+1 and 1+1 on the board address hardware redundancy - the former covers full equipment redundancy, while the latter covers individual card/board-level failover within a chassis. Since all five are correct, there are no distractors - the question tests whether you know that WDM protection is multi-layer: it exists simultaneously at the optical line, client signal, OTN protocol, chassis, and component levels.

Memory tip: Think of the acronym "C-D-O-L-B" (Client, Device, ODU, Line, Board) as "Can Defense Only Last By layers?" - each letter maps to a protection type from a different layer of the WDM stack, reminding you that protection is not just one mechanism but a full hierarchy.

No community discussion yet for this question.