Ethernet technology is rapidly taking over legacy technologies within the
carrier infrastructure (e.g. TDM, ATM and SONET / SDH) where synchronization and clock distribution are an integrated part of the technology. Ethernet, originally designed as a ”best-effort” data delivery technology, is now being equipped with synchronization and clock distribution features. The introduction and employment of Synchronous Ethernet (SyncE) allows Ethernet to provide the same level of quality and reliability as legacy technologies for use in carrier class applications.