A power system apparatus replaces outdated and presently unobtainable power systems originally deployed in a variety of RT communication cabinets, incorporating a plug-in programmable control module used to generate alarms in response to the detection of specified events and providing direct plug compatibility to those RT cabinet systems through the use of unique wiring harnesses. Support for advanced broadband and high speed communication circuits, neither originally envisioned nor designed into the original communication RT system, is now provided.