Abstract: A fiber optic patch panel module for accepting an optical fiber cable, and for use with telecommunications transmission networks mountable in an existing network bay frame designed for mounting electrically conductive wire patch panels comprises a housing having at least a top panel and a bottom panel. A mounting tang is disposed on the top panel, and a mounting notch is located on the bottom panel. The mounting notch is capable of accepting rail tangs of a shelf which in turn mounts to on the network bay frame. The patch panel is capable of pivotal movement about the rail tangs when the rail tangs are disposed in the mounting notch, and the mounting tang is capable of releasably engaging a rack rail on the shelf.