Recommendation ITU-T G.8051/Y.1345 addresses management aspects of the Ethernet transport network element containing transport functions of one or more of the layer networks of the Ethernet transport network. The management of the Ethernet layer networks is separable from that of its client layer networks so that the same means of management can be used regardless of the client. The management functions for fault management, configuration management, performance monitoring, and security management are specified. The 2009 Revision of this Recommendation has added the management of additional transport functions that have been introduced in the 2009 Revision of Recommendation ITU T G.8021/Y.1341. The 2013 Revision of this Recommendation has added the management of additional functions, including: CSF; proactive loss measurement using LMM/LMR; proactive delay measurement using DMM/DMR and 1DM; synthetic loss measurement using SLM/SLR and 1SL (proactive and on-demand); PM requirements on PDU generation type, Message period, Measurement interval, Repetition period, Start time, Stop time and Session duration; and PM data collection requirements.