FDMA access provides up to 10 frequency channels, and TDMA access provides 24 time slots per every frame of 10 ms. DECT uses time division duplex (TDD), which means that down- and uplink use the same frequency but different time slots. Thus a base station provides 12 duplex speech channels in each frame, with each time slot occupying any available channel – thus 10 × 12 = 120 carriers are available, each carrying 32 kbit/s.