Cisco 2951 integrated services router integrated services router offers embedded hardware encryption acceleration voice- and video-capable digital signal processor (DSP) slots optional firewall intrusion prevention call processing voicemail and application services. In addition the platforms support the industries widest range of wired and wireless connectivity options such as T1/E1 T3/E3 xDSL copper and fiber GE. Expansion slots: (3 total) services module. Number of expansion slots: 13. Interfaces/Ports: 2 x type A USB. Expansion slots: (3 total) PVDM. Expansion slots: (4 total) HWIC. Flash Memory: 256 MB. Interfaces/Ports: 1 x type B USB management. Interfaces/Ports: 3 x RJ-45 10/100/1000Base-T WAN. Interfaces/Ports: 1 x RJ-45 RS-232 console management. Compatible rack unit: 2U. Form factor: Rack-mountable. Standard Memory: 512 MB. Number of ports: 3. Dimensions: 3.50 H x 17.25 W x 18.50 D.