The D38999/26WH55PB L/C part of TE Connectivity is an optically-isolated, 38999 Series-III, circular, composite connector with a 3-key polarization system. This connector incorporates a planar beam terminal contact arrangement designed for increased polarization, current-carrying capabilities, and reliable mating. It supports applications such as high-speed data and full mechanical engagement during mating to protect the RF and high-speed data interface. This part consists of a zinc-framed shell, jam nuts, a jam nut retaining band, and a shell empty-channel indicator all within one assembly. The contacts are housed in a metallic shell and are comprised of a 2-piece design contact springbody.