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Posted by Marris on December 13, 2006, 2:57 pm
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PHYs send idle characters when there is no activity. This gives the receive
PLL something to lock onto.
These idle characters are generated by the PCS (physical coding sublayer)
when idle is indicated on xMII.
>
> An ethernet PHY (serdes) immediately notices whether there is an
> ethernet
> link, even when autonegotiation is disabled (on both sides).
> How exactly does this work, does the PHY continuously send some kind of
> "background" Fast Link Pulses ?
>
> Is there something like background/inactivity traffic in full-duplex
> ethernet
> (say 100BaseT), what about 1000BaseT and 1000BaseX (optical) ?
> Does the same go for 10/100 half-duplex ethernet (CSMA-CD) ?
>
> I just wonder what goes over the (serial) ethernet wire-pairs when no
> data
> is exchanged (temporarily).
>
> I guess the parallel (xMII) link between PHY and MAC never exchanges
> inactivity like traffic, is this true ?
>
> ----------------------------------
> bolnvhuis@wanadoo.nl
>
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