All our power supplies are shipped pinned for internal line frequency clock. If Sequence of Events (SOE) functinality 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. This jumper is located at the back of the printed circuit board at location J1, and is clearly marked (INT) and (EXT).

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