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OAM/IP-Based Remotely Managed features auto-negotiation (802.3u), auto-negotiation allows devices to perform automatic configuration to achieve the best possible mode of operation over a link. Devices with this feature will broadcast their speed and duplex (half/full) capabilities to other devices and negotiate the best mode of operation between the two devices.
Far End Fault (FEF) is a troubleshooting feature that is generally used in conjunction with link pass through to notify both end devices of a loss of link. In the event of a loss of the fiber RX signal on the far end converter the converter will automatically generate a Far End Fault signal and send it on its TX fiber port to notify the near end converter of a fiber link loss. Link pass through will then disable the copper links on both ends; alerting both end devices of network trouble.