This Recommendation provides terms, definitions, and abbreviations used in Automatically Switched Optical Network (ASON) Recommendations. It contains a list of the definitions and abbreviations introduced in Recommendations associated with Automatically Switched Optical Networks, and can be considered a companion document to ITU?T Recs G.780/Y.1351 and G.870/Y.1352. The goal of this Recommendation is to be a single normative source for terms in this subject area.