This read-only value reports the slot number of the corresponding DS1 interface, specifically within the context of the 'current' 15-minute performance statistics table entry (paired with dsx1CurrentESs, dsx1CurrentSESs, etc.), duplicating the identification role of dsx1SlotId but scoped to this particular statistics table. This lets an admin correlate a row in the current-interval performance table back to the exact physical card without needing to cross-reference a separate table. An engineer pulling up the current-interval error table for a chassis with many DS1 cards would use dsx1CurrentSlotId to identify which physical slot each row of statistics belongs to.