gps10MHzPortInputSignalType is a read-write setting specifying the input signal type on this port, either 10MHz or 2048kHz. An administrator must set this to match whatever frequency the connected GPS receiver or external clock source actually outputs, since selecting the wrong type will make the port fail to correctly interpret the incoming reference. For example, a GPS receiver that outputs a 2048kHz reference rather than the more common 10MHz would require this object changed from its default before the port can lock onto that signal.