The BR851241A splitting "Y" adapter converts a T568B wired RJ45 Jack into two 2-Pair jacks. Pairs 1 & 2 are split to the center positions of jack (1), and pairs 3 & 4 are split to center positions of jack (2). This adapter is designed for connecting two pieces of voice, data or ancillary equipment to a T568B, RJ45 jack.