Methods and apparatus for delivering power down all conductors of an
Ethernet connection are disclosed. Embodiments include control circuitry
coupled to both conductor of an Ethernet cable. The control circuitry is
configured to sense the current flowing through power switches coupled
inline with the respective conductors and control the switch in order to
maintain the current flow through the power switch below a predetermined
level. The circuitry prevents Ethernet ports from being shutting down due
to conditions caused by imbalances in the effective resistance of
Ethernet conductors and circuit paths.