t1 slotSpecification Model Name T1 Reference Kit T1 Sandwich Kit Model Code T1-REF-SDK T1-SW-SDK Overview Compared to the T1 - Sandwich Kit, this confuration is a better choiceThe first time slot is numbered 1. For a T1 controller, the time slot range is from 1 to 24. For an E1 controller, the time slot range is from 1 to 31. unframed—Unframed mode