Direct Current Switching Unit (DCSU) 4A Power On Reset (POR): Tuesday evening at 6:10 pm CDT DCSU-4A experienced a POR. Power was lost to 3 downstream Direct Current-to-Direct Current Converter Units (DDCUs) plus the DDCU on the P4 Integrated Equipment Assembly (IEA). Service Module voltage and current stabilizers [CHT]s 23 and 24 also lost power …






