I am thinking about the different proposals done, concerning
the discovery process, that in case where the terminal is
locally powered then the power via MDI is not sent.
Unfortunately, this case will be unavoidable since very often
the terminal is installed by the end user who is not awared
about the properties of the network infrastructure.
Moreover the network is able to provide a safe power
distribution (power with battery-back-up) and therefore
it will be better to provide such a power to any terminals.
What are you thinking about this problem?
Our solution is to analyse the impedance under alternative
voltage and this analyse stays efficient even the terminal
is locally powered and therefore this allows providing a
safe power to terminal whatever its state and in case of mains
breaking holding the current communication with this terminal.