t1 slotslotport: Slot number and port number where the channelized E1 or T1 controller is located. number : Channelized E1 or T1 controller number. timeslots: For ISDN, the D channel timeslot,Some more clarification on T1 v2.0 (And M.2 support for Asus DTX motherboards when using C14s) ... The 6800XT isn't actually a full 2.5 slots, AMD just said that for simplicity sake