Cisco 3925-K9 Integrated Services Router

What It Is

The CISCO3925/K9 is a modular enterprise-class integrated services router from the Cisco 3900 Series ISR (Integrated Services Routers) family. It is designed for medium-to-large branch offices and campus deployments, combining high-performance routing with integrated security, unified communications, and application services in a single chassis.

Technical Details

• Chassis: Cisco 3925 with SPE100 service performance engine
• Ethernet Ports: 3 x GE (Gigabit Ethernet) onboard
• Expansion Slots: 4 x EHWIC (Enhanced High-Speed WAN Interface Card) slots
• DSP Slots: 4 x DSP (Digital Signal Processor) slots for voice and video processing
• SM Slots: 2 x SM (Service Module) slots for additional services and modules
• Memory: 1 GB DRAM (default), 256 MB CompactFlash

Configuration & Options

• Part Number: CISCO3925/K9 — base system with SPE100 and onboard PB (Power Board)
• Platform Variants: Related models in the 3900 series include C1-CISCO3925/K9 (Cisco ONE ISR 3925) and C3925-AX/K9 (application and security license bundle)
• Voice/UC Options: AXV bundle (C3925-AXV/K9) includes PVDM3-64, application, security, UC licenses, and CUBE-10 for unified communications
• Expansion: Supports additional EHWIC, SM, and DSP modules to tailor interfaces and services per deployment needs

Operating Conditions

The router is intended for deployment in enterprise branch offices and regional sites requiring converged traffic handling — data, voice, and video. It operates within standard indoor telecommunications environments, supporting rack-mount installation in wiring closets or server rooms. The modular architecture allows field upgrades and service expansion without chassis replacement, making it suitable for multi-year infrastructure lifecycles.