Summary

Amendment 1 to Recommendation ITU-T G.7041/Y.1303 (2011) specifies the not-operational primitive sequence (NOS) as the preferred replacement signal for both the single-byte command code sets connection/enterprise systems connection (SBCON/ESCON) and fibre channel signals in optical transport network (OTN) mapping. Legacy equipment may continue to use the replacement signals originally described in this Recommendation.