Qolsys firmware 2.5 PowerG jam detection

I see a new option for PowerG jam detection in the firmware update; UL20/20 and en30/60.
What is the difference?

These are referencing US and European standards for Jam detection.

UL 20/20 means looking for 20 continuous seconds of jamming.
EN 30/60 means looking for 30 aggregate seconds of jamming in 1 minute.