Power supply current, sufficient to power a remote network device, is
transmitted concurrently with a network data signal over a transmission
line. A power-sourcing network device that can include a coupling circuit
provides power and data to the remote network device. The remote network
device (which can be a wireless access point) can separate the power
signal from the data signal and use the power supply current to further
process or retransmit the data signal. The power signal may be a low
frequency relative to the frequency of the data signal, or it may be DC.
