The rear of the optional 19” rack has four individual AC inputs supplied through an IEC320 C20 line cord or through optional screw terminal blocks. The PMBus communications interface is available via two RJ45 connectors and the other control signals through one 40-pin Samtec IPD1-20-D connector. The output is supplied via two sets of bus bars, which can provide up to 640A. Two rack units can be paralleled together for a total of eight HFE supplies, with load sharing.