Swing-Out Fiber Distribution Units Plugsters Swing-Out FDU’s are accessible via a swing-out master panel that opens on the top of the unit.FRM-1RU-2X-SO 2 panels, 1.75″H x 17″W x 11.0″D Rack Mount FDU 1RU in height with 2 termination panel capacity and swing out master panel tray. FRM-2RU-4X-SO 4 panels, 3.5″H x 17″W x 11.0″D Rack Mount FDU 2RU in height with 4 termination panel capacity and swing out master panel tray.