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Model Number:
Cisco ISR 4451-X/K9 router(4GE,3NIM,2SM,8G FLASH,4G DRAM)
1-2G system throughput, 4 WAN/LAN ports, 4 SFP ports, 10 Core CPU, Security, Voice, WAAS, Intelligrnt WAN, OnePK, AVC, separate control data and services CPUs

Specifications of Cisco 4000 Series Integrated Services Routers

Technical SpecificationsCisco 4451Cisco 4431Cisco 4351Cisco 4331Cisco 4321Cisco 4221
Aggregate Throughput1 Gbps to 2 Gbps500 Mbps to 1 Gbps200 Mbps to 400 Mbps100 Mbps to 300 Mbps50 Mbps to 100 Mbps35 Mbps to 75 Mbps
SFP-based ports443311
Enhanced service-module slots202100
Doublewide service-module slots1 (assumes no singlewide SM-X modules installed)01 (assumes no singlewide SM-X modules installed)000
Maximum memory DDR3 ECC DRAM (Combined control/services/data planes)NANA16 GB16 GB8 GB4 GB
Default memory DDR3 ECC DRAM (data plane)2 GB2 GBNANANANA
Maximum memory DDR3 ECC DRAM (data plane)2 GB2 GBNANANANA