The Cisco 3825 is a modular fixed-configuration router designed for mid-market branch offices and remote sites requiring integrated voice, security, and data services. This unit ships with the PVDM2-64 voice DSP module for VoIP processing, Advanced IP Services IOS, and 128 MB Flash / 512 MB DRAM standard configuration. The /K9 designation indicates full cryptographic capabilities for IPsec VPN, supporting encryption-heavy security deployments. The 3825 offers two integrated Fast Ethernet ports plus one WIC slot for flexible WAN connectivity options (serial, additional Ethernet, or DSL). Typical throughput ranges from 15–40 Mbps depending on services enabled; performance is well-suited to branch consolidation, voice over IP gateway operations, and encrypted remote access. Compatible with Cisco IOS 12.4 and later; field-upgradeable memory and service modules support growth without platform replacement. Commonly deployed in small-to-medium enterprise networks where integrated routing, firewall, and VoIP handling eliminate separate appliances.
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