Cisco ISR4351-VSEC/K9 Integrated Services Router

What It Is

The Cisco ISR4351-VSEC/K9 is a modular integrated services router from the Cisco ISR 4000 series, designed for enterprise branch offices and mid-sized deployments. This bundle combines unified communications and security licensing with a PVDM4-64 digital signal processor module, enabling integrated voice, video, and secure data transport in a single chassis. The router supports high-density WAN connectivity, concurrent services, and scalable performance for demanding network environments.

Technical Details

• Model: ISR4351-VSEC/K9 (Cisco ISR 4351 Bundle with UC & Sec Lic)
• Included DSP: PVDM4-64 (packet voice/data module with 64 channels)
• Licensing: Unified Communications (UC) and Security (SEC) licenses pre-installed
• Chassis class: ISR 4000 series modular router
• Service integration: Voice, video, security, and data on one platform
• Platform capability: Supports NIM (network interface module) slots for WAN/LAN modularity
• Memory and storage: Factory-configured for enterprise-grade throughput (per ISR 4351 baseline)

Configuration & Options

• Bundle contents: ISR4351 chassis, PVDM4-64 module, UC and SEC license entitlements
• Available options: Additional NIM modules for T1/E1, fiber, or copper WAN interfaces
• Expansion: SM (service module) slots for further services (e.g., packet inspection, acceleration)
• Licensing flexibility: SEC license can be upgraded to stronger security feature sets (e.g., Firepower)
• Compatibility: Operates with Cisco IOS XE software, supporting advanced routing protocols and QoS

Operating Conditions

The Cisco ISR4351-VSEC/K9 is deployed in enterprise branch offices, regional headquarters, and campus aggregation points where integrated security and unified communications are required. It operates in standard indoor rack-mount environments (19-inch racks) with ambient temperatures from 0°C to 40°C and non-condensing humidity up to 85%. The router is suited for always-on service delivery, supporting redundant power supplies and failover WAN links for high availability in critical network segments.