To achieve the best performance and the highest reliability of a network it is essentially important to manage the powering system. Although the eventual short-time voltage spikes, dropouts or wobbling can damage the CATV devices in the long run, the typical monitoring transponders does not registrate these anomalies. Further in case of a total system-down the operator must decide very fast whether the power supply system or the first element of the transmission line has a break-down. To overcome these problems COMTECH has developed the PSU Monitor. The device detects the harmful events on the powering line and sends standard SNMP alarms to a given access point. Our PSU Monitor works even in case of power-cut thanks to its built-in battery, and communicates by using GSM system in order to achieve full independency from the managed CATV network. This solution can be used for any powering system, not only for telecommunication networks.