> There are many devices out there that use the extra pairs for power as
> well.  Used for ethernet cameras, remote powerless hubs, some 802.11
> access points, etc.  Not terribly common, I suspect becuase there is no
> standard and they are often incompatible from manufacturer to
manufacturer.

Such a standard is being worked on now, although I think is uses the
existing two pairs.  I think a draft is already available.  You will soon
see hubs that supply power over the ethernet and low end ethernet devices
that require such power.  Kinda like USB.


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