The evolution and application of microprocessor control and monitor units in the central office power equipment

In July 1983, the first microprocessor-controlled power plant was installed in a Southern Bell central office to power a Northern Telecom DMS-100 switch. Since that time, the evolution of applications for that technology has continued to expand to meet desired or forecasted requirements. The initial technology is discussed, followed by a description of second-generation units. In order to achieve objectives of almost total remote office monitoring and surveillance, a group of alarms was specified that must be issuable from every newly installed plant, regardless of vendor. This allows all engineers and operations personnel to recognize the same power alarm indications from location to location. These alarms/codes were initially developed utilizing standards from several regional documents. Further developments are also summarized with particular emphasis on the new Lorain monitor. Future prospects are also assessed.<>