I've always assumed that this was the heartbeat function between the
transceiver and Ethernet controller. After searching CCO, I couldn't find
any literature on the topic!VoIP Guy wrote:
> 
> what does an ethernet keepalive packet look like?  Who does a
> router send
> one to (especially if connected to a switch).  Is it looking
> for voltage or
> something else?
> 
> 




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