Sector segment mail is for routes with multiple residence addresses with a letter space #, or space #'s out of order on your route, (neither can be put in DPS order ),or for routes that have failed a DPS review . If the mail mentioned isn't DPS'ed, or in sector segments, it is raw letters. I believe, if the edit sheet is up to date, and this is happening, where the DPS doesn't meet the 2400 piece threshold, the whole route should be sector segmented, except the 30% raw mentioned.