as more and more traffic is being delivered in ethernet format,carriers are reelizing the advantages to migration to pure Ethernet infrastrucyure,but there are some features that not able to do so with Ethernet as presently defind.new standard/recommendations from MEF/ITU/IEEE make the Ethernet networks close the gap between Ethernet and SONET/SDH networks.
the final diffrerence between conventional TDM-base network and ethernet is that the former also transport frrequency information ,need for some application,while Ethernt does not.numerous methods have been suggested for augmenting Ethernt to distribute frequncy and /or timing informatin,such as IEEE 1588,SYNE,NTP
in this article by Antonis Karvelas he cover the metod for transport of synchronization over Ethernet network
