A fiber optic telecommunications tray comprising: a base plate ; a cable containment wall structure extending from the base plate and defining a cable management space on the base plate; a fiber storage device arranged in the cable management space and configured to route and store fibers; a fiber termination device arranged in the cable management space and configured to hold connectorized ends of the fibers; wherein the fiber optic telecommunications tray has a proximate side and a distal side opposite to the proximate side; wherein the fiber termination device includes one or more fiber optic adapters for receiving the connectorized ends of the fibers, the one or more fiber optic adapters including a first fiber optic adapter and a second fiber optic adapter arranged parallel with each other, each of the first and second fiber optic adapters being disposed in the fiber optic telecommunications tray along an axis (X1, X2); and hinge members of a tray mounting interface on the proximate side of the fiber optic telecommunications tray, the hinge members defining a hinge axis (X3) perpendicular to a tray axis (X4) characterized by a fiber splice device arranged in the cable management space and configured to hold spliced fibers, wherein the fiber splice device includes a plurality of splice slots configured to receive the spliced fibers; wherein the fiber storage device is arranged adjacent the distal side of the tray, the fiber termination device is arranged adjacent the proximate side of the tray, and the fiber splice device is arranged between the fiber storage device and the fiber termination device; and said axis (X1, X2) extending between a first cable entrance side and a second cable entrance side . a base plate ; a cable containment wall structure extending from the base plate and defining a cable management space on the base plate; a fiber storage device arranged in the cable management space and configured to route and store fibers; a fiber termination device arranged in the cable management space and configured to hold connectorized ends of the fibers; wherein the fiber optic telecommunications tray has a proximate side and a distal side opposite to the proximate side; wherein the fiber termination device includes one or more fiber optic adapters for receiving the connectorized ends of the fibers, the one or more fiber optic adapters including a first fiber optic adapter and a second fiber optic adapter arranged parallel with each other, each of the first and second fiber optic adapters being disposed in the fiber optic telecommunications tray along an axis (X1, X2); and hinge members of a tray mounting interface on the proximate side of the fiber optic telecommunications tray, the hinge members defining a hinge axis (X3) perpendicular to a tray axis (X4) characterized by a fiber splice device arranged in the cable management space and configured to hold spliced fibers, wherein the fiber splice device includes a plurality of splice slots configured to receive the spliced fibers; wherein the fiber storage device is arranged adjacent the distal side of the tray, the fiber termination device is arranged adjacent the proximate side of the tray, and the fiber splice device is arranged between the fiber storage device and the fiber termination device; and said axis (X1, X2) extending between a first cable entrance side and a second cable entrance side . <EOS>