This is the lowest value recorded during the current performance-monitoring interval of the propagation delay measured on the ODU (optical channel data unit) signal traversing this port, expressed in microseconds. The lowest delay recorded shows the fastest the signal has traveled the path, effectively the physical floor set by fiber length and the speed of light in glass. For example, comparing oduDelayMin across two candidate fiber routes lets an admin choose the physically shorter path for a customer that needs the lowest possible latency.