This is the highest 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 highest delay recorded flags any transient latency spike, which matters because a sudden jump in maximum delay, without a change in minimum, can indicate a protection switch rerouted traffic over a longer physical path. For example, if oduDelayMax jumps noticeably right after a fiber cut elsewhere in the network while the average barely moves, that pattern points to a protection reroute onto a longer standby path rather than a gradual degradation.