The present disclosure provides service-resdy trunk protection switching. More particularly, the present disclosure focuses on 1:N trunk protection for a given fiber span or for a given optical path (plurality of spans) between two nodes. In such configuration, each protection-link between two nodes can have different hop-counts (e.g., number of spans, amplifiers etc.), EDFA only amplified vs. Raman amplification and different fiber-types from each other on different spans within the protection group. Typically, Trunk Protection Switch (TPS) can work with total-power offset (such as if total-power drops below certain threshold then switch) or with pilot-tones (i.e., if pilot-tone goes missing from an active-path, then switch to other). However, in 1:N trunk-protection, with (N-1) protection-link options, when the active-path gets faulted, switching randomly to one of the links does not guarantee that the traffics will recover within 50ms or such shorter timeframe.
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Anonymous, "SERVICE-READY TRUNK PROTECTION SWITCHING", Technical Disclosure Commons, (February 28, 2022)