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| Cisco 2800 Series | Cisco 2801 | Cisco 2811 | Cisco 2821 | Cisco 2851 | |||
| Product Architecture | |||||||
| DRAM | Default: 128 MBMaximum: 384 MB | Default: 256 MBMaximum: 768 MB | Default: 256 MBMaximum: 1 GB | ||||
| Compact Flash | Default: 64 MBMaximum: 128MB | Default: 64 MBMaximum: 256 MB | |||||
| Fixed USB 1.1 Ports | 1 | 2 | |||||
| Onboard LAN Ports | 2-10/100 | 2-10/100/1000 | |||||
| Onboard AIM (Internal) Slot | 2 | ||||||
| Interface Card Slots | 4 slots; 2 slots support HWIC, WIC, VIC, or VWIC type modules1 slot supports WIC, VIC, or VWIC type modules1 slot supports VIC or VWIC type modules | 4 slots, each slot can support HWIC, WIC, VIC, or VWIC type modules | |||||
| Network-Module Slot | No | 1 slot, supports NM and NME type modules | 1 slot, supports NM, NME and NME-X type modules | 1 slot, supports NM, NME, NME-X, NMD and NME- XD type modules | |||
| Extension Voice Module Slot | 0 | 1 | |||||
| PVDM (DSP) Slots on Motherboard | 2 | 3 | |||||
| Integrated Hardware- Based Encryption | Yes | ||||||
| VPN Hardware Acceleration (on Motherboard) | DES, 3DES, AES 128, AES 192, and AES 256 | ||||||
| Optional Integrated In-Line Power (PoE) | Yes, requires AC-IP power supply | ||||||
| Console Port (up to 115.2 kbps) | 1 | ||||||
| Auxiliary Port (up to 115.2 kbps) | 1 | ||||||
| Minimum Cisco IOS Software Release | 12.3(8)T | ||||||
| Rack Mounting | Yes, 19-inch | Yes, 19- and 23-in. options | |||||
| Wall Mounting | No | Yes | No | No | |||