A method for testing a cathodic protection system is disclosed where the
system includes a cathodic protection rectifier configured to apply a
voltage across a pipeline and a reference point. The method includes
measuring a magnitude of an output voltage of the cathodic protection
rectifier, transmitting to a site remote from the rectifier, the measured
output voltage magnitude using a cellular control channel, receiving the
transmitted measurement at the remote site, and using the transmitted
measurement to determine whether the cathodic protection system is
operational.