| Detail: |
500Mbps-1Gbps system throughput, 4 WAN/LAN ports, 4 SFP ports, multi-Core CPU, Dual-power, Security, Voice, WAAS,
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Cisco ISR4431-V/K9 Integrated Services Router
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Categories: Cisco Router ISR 4000, Cisco Routers, Routers
Brand: Cisco
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| Description | Cisco ISR 4431 (4GE, 3NIM, 8G FLASH, 4G DRAM, VOIP) |
| Aggregate Throughput | 500Mbps to 1Gbps |
| Total onboard WAN or LAN 10/100/1000 ports | 4 |
| RJ-45-based ports | 4 |
| SFP-based ports | 4 |
| Enhanced service-module slots | 0 |
| Doublewide service-module slots | 0 |
| NIM slots | 3 |
| OIR (all I/O modules) | Yes |
| Onboard ISC slot | 1 |
| Default memory double-data-rate 3 (DDR3) error-correction-code (ECC) DRAM (Combined control/services/data planes) | NA |
| Maximum memory DDR3 ECC DRAM (Combined control/services/data planes) | NA |
| Default memory DDR3 ECC DRAM (data plane) | 2 GB |
| Maximum memory DDR3 ECC DRAM (data plane) | 2 GB |
| Default memory DDR3 ECC DRAM (control/services plane) | 4 GB |
| Maximum memory DDR3 ECC DRAM (control/services plane) | 16 GB |
| Default flash memory | 8 GB |
| Maximum flash memory | 32 GB |
| External USB 2.0 slots (type A) | 2 |
| USB console port -type B mini (up to 115.2 kbps) | 1 |
| Serial console port - RJ45 (up to 115.2 kbps) | 1 |
| Serial auxiliary port - RJ45 (up to 115.2 kbps) | 1 |
| Power-supply options | Internal: AC, DC, and PoE |
| Redundant power supply | Internal: AC, DC, and PoE |
| AC input voltage | 100 to 240 VAC autoranging |
| AC input frequency | 47 to 63 Hz |
| AC input current range, AC power supply (maximum) | 3 to 1.3A |
| AC input surge current | 60 A peak and less than 5 Arms per half cycle |
| Typical power (no modules) (watts) | 65 |
| Maximum power with AC power supply (watts) | 250 (no PoE) |
| Maximum power with PoE power supply (platform only) (watts) | 500 with PoE redundant |
| Maximum endpoint PoE power available from PoE power supply (watts) | 250 W with optional redundancy |
Frequently Asked Questions
The ISR4431-V/K9 is a Cisco 4000 Series Integrated Services Router that includes the Voice (V) bundle, combining enterprise routing with voice and unified communications support. It is designed for secure WAN connectivity, branch networking, and voice-enabled business environments.
The “V” in ISR4431-V/K9 stands for Voice Bundle, meaning the router includes voice capabilities and UC (Unified Communications) support. This allows businesses to deploy voice gateways and communication services alongside data routing on a single platform.
This router is commonly used for: Enterprise branch WAN routing Voice gateway & UC deployments Secure VPN connectivity Hybrid cloud networking Converged voice + data networks It is widely deployed in organizations that need both enterprise routing and VoIP capability.
The ISR4431-V/K9 supports aggregate throughput from 500 Mbps up to 1 Gbps, depending on licensing and configuration. This makes it suitable for medium-to-large enterprise branch offices running voice, video, and data traffic simultaneously.
Yes. The ISR4431-V/K9 includes voice functionality and typically ships with PVDM4 voice module support, enabling enterprise voice gateways, VoIP services, and unified communications workloads.
Yes. The ISR4431 platform runs Cisco IOS XE and supports SD-WAN deployments, enabling centralized policy control, secure multi-site connectivity, and application-aware routing — a key reason this model is still widely searched.
The ISR4431-V/K9 is widely used across industries that rely heavily on voice and branch connectivity: Banking & Financial Services Healthcare & Hospitals Corporate Enterprises Retail Chains & Call Centers Education Institutions Manufacturing & Logistics Government & Public Sector These industries need reliable branch routing with integrated voice communication.
Yes. It is widely used in enterprise branch deployments because it combines: High WAN performance Voice gateway capabilities Modular expansion Secure enterprise networking This makes it ideal for communication-heavy branch locations.
Typical interfaces include: 4 × Gigabit Ethernet RJ-45 ports 4 × SFP uplink ports 3 × NIM expansion slots USB console & management ports This modular architecture allows flexible WAN, LAN, and voice expansion.
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