Thiết bị router Cisco 2921 w/3 GE,4 EHWIC,3 DSP, 3 integrated 10/100/1000 Ethernet ports (RJ-45 only), 2 service module slot, 4 Enhanced high-speed WAN interface card (EHWIC) slots, 3 onboard digital signal processor slots1 Internal Service Module slot for application services, 1 SM, 256MB CF, 512MB DRAM, IP Base.