TG310 is a new Talkgroup in the DMR network, with the ability to reach users around the world. It´s like a meeting point to make contact with other hams worldwide. The “TAC 310” will be inactive on your repeater until someone goes into this TG and push PTT.
You can make a QSO Spain-EEUU site-to-site and no need to worry about using minutes in all repeaters around the net (using their slots). After a a couple of minutes (10 minutes) of inactivity the talkgroup connection will automatically drop.
The TAC310 use the timeslot-2. If you want more information about this nice feature, take a look at the “DCI Website“.