Cisco 2900 Series Integrated Services Routers
Specifications
| Cisco 2901 | Cisco 2911 | Cisco 2921 | Cisco 2951 | |
| Total Onboard WAN 10/100/1000 Ports | 2 | 3 | 3 | 3 |
| RJ-45-Based Ports | 2 | 3 | 3 | 3 |
| Memory DDR2 ECC DRAM – Default | 512 MB | 512 MB | 512 MB | 512 MB |
| Memory (DDR2 ECC DRAM) – Maximum | 2 GB | 2 GB | 2 GB | 2 GB |
| Compact Flash (External) – Default | slot 0: 256 MB slot 1: none | slot 0: 256 MB slot 1: none | slot 0: 256 MB slot 1: none | slot 0: 256 MB slot 1: none |
| Compact Flash (External) – Maximum | slot 0: 4 GB slot 1: 4 GB | slot 0: 4 GB slot 1: 4 GB | slot 0: 4 GB slot 1: 4 GB | slot 0: 4 GB slot 1: 4 GB |
| External USB 2.0 Flash Memory Slots (Type A) | 2 | 2 | 2 | 2 |
| USB Console Port (Type B) (up to 115.2 kbps) | 1 | 1 | 1 | 1 |
| Serial Console Port | 1 | 1 | 1 | 1 |
| Serial Auxiliary Port | 1 | 1 | 1 | 1 |
| Rack Height | 1RU (rack unit) | 2RU | 2RU | 2RU |
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