All our power supplies are shipped pinned for internal line frequency clock. If Sequence of Events (SOE) functionality is required on a NIM, the clock master, the clock slave, and the NIMs with SOE requirements must be pinned for use with external clocks. All other nodes are pinned for internal (line frequency) clock. The jumper is located on the printed circuit board, and is not marked (EXT) or (INT). For internal line frequency clock (INT), the jumper must connect E20 and E21. For external clock source (EXT), the jumper must connect E21 and E23.

WPC refurbishes LCN power supplies replacing electrolytic capacitors and verify output voltage specs.