t1 slotSwitch FormD T1 From 2-Slot Mode To 3-Slot Mode. Since the air cooled GPU we will be using is massive, we need to switch to 3-slot mode. First swap out the 2-slot GPU bracket for the 3-slotA basic T1 frame DS1 (dital snal-level one) contains 24 DS0 (64kbps) time slots, numbered from 1 to 24, each time slot has 8 bits, a total of 192 bits. The T1 basic frame also includes an