A power management circuit for a remote access platform extracts power from a
wireline
for powering a ring generator that generates a ringing voltage signal that is distributed
to a plurality of subscriber circuits. A power-limited voltage converter steps
up the wireline voltage to a higher 'isolating' voltage, charging a capacitor coupled
to the ring generator. A monitor circuit reduces the power that the power-limited
voltage converter can draw, if the wireline voltage drops too low. This prevents
the wireline voltage from collapsing should the remote terminal be deployed at
a distance from wireline voltage source (the central office) greater than its specified capability.
