MSR4000 SPU-300 Service Processing Unit - Service Processing Unit (SPU) with 4GB DDR SDRAM, four combo ports (either 1000M BASE-T RJ45 or 1G SFP ports), one SFP+ port, two USB ports, and two internal VPM module slots (LT: 2-4D)
PCI Riser cage assembly - Includes the metal cage assembly with the 2-slot primary optional PCI riser board - Includes one Half-Length PCIe 3 x 16 slot and one Half-Length PCIe 3 x 8 slot (LT: 2-4D)