10 Synchronous Ethernet (SyncE)

Synchronous Ethernet (SyncE) uses a physical layer interface to pass timing from one node to the other, in the same manner as timing is passed in SONET or SDH. SyncE, as defined by ITU-T standards, such as G.8261, G.8262, G.8264, and G.781, leverages the physical layer of Ethernet to transmit frequency to remote sites. This synchronous transmission of frequency over Ethernet provides a cost-effective alternative for network designers. For SyncE to work, each network element along the synchronization path must support SyncE.