A simple way to view a timeslot (TS) is that it refers to 1 of the 2 slices of time in a DMR Tier II signal. It means that 2 voice or 2 data paths are available simultaneously on a single DMR repeater. So a DMR repeater can carry twice the “traffic” in about half the channel space compared to a FM repeater.
In DMR Tier 2 (2-slot TDMA), the radio transmit for 30 milliseconds and then receives for 30 milliseconds. The radio listens for a permission to transmit by sync’ing up to the repeater and then begins a call to all other talkgroup members who will also receive on that same time slot. This enables full duplex communication as well as break-in on an active user.