Link OAM Ethernet OAM and SAT

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RFC 2544 or SAT: Focuses on benchmarking network devices, not fault detection or real-time monitoring.
Y.1564: Ethernet Service Activation Test Methodology – Focuses on validating Ethernet service performance by testing multiple services
IEEE 802.3ah: Focuses on local Ethernet link monitoring, useful for Ethernet in the First Mile (EFM).
IEEE 802.1ag (CFM & CCM): Focuses on end-to-end Ethernet service monitoring, useful in Carrier Ethernet and Metro Ethernet networks.

E-line and E-LAN testing with RFC 2544 and Y.1564

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