The 3 in 1 quick cable is a 25 pair cable with 3 amphenol ends which attach 3 digital or single line station cards to one 25 pair cable. It save 2 66 blocks, wall space and installation time. The 3 in 1 works on: DK24, DK56, DK96, DK280 & DK424 systems. A must…makes the install fast and easy.