1. A receiver comprising: preamble synchronization logic configured to synchronize to a preamble frame of an Ethernet signal received from a transmitter over a channel, the preamble frame comprising one or more preamble codes, the preamble frame adjacent to an idle signal frame of the Ethernet signal; a preamble generator configured to replicate the one or more preamble codes; and a decision feedback equalizer (DFE) configured to undergo training based on the one or more replicated codes, the training enabling the DFE to use decision values at the DFE output to track channel variations.