The explosive increase of global data service requires that optical transport network provide flexible network configuration and efficient network protection
so the emergence of automatic switched optical network accords with this new development trend of optical network. ASON is a set of optical infrastruc- ture with high flexibility and extensibility
which can provide service at optical layer directly and can fulfill the requirements of subscribers
so it can solve some network problems perfectly
such as extensibility
manageability
subscriber bandwidth distribution and end-to-end network protection. This paper intro- duces the standardization status of ITU-T
IETF and OIF
then summarizes the fruit of ASON standard in China.