A static talkgroup is one that is permanently activated on a particular timeslot by the repeater sysop. This type of static assignment passes ALL traffic from the DMR network over the air on the timeslot it is assigned to.
For example, if a statewide talkgroup is assigned to the local repeater on timeslot 1, anytime someone keys that talkgroup on the network, regardless of where they are, the audio will be retransmitted locally.
In simple terms, this networks many repeaters together full-time for that particular talkgroup.