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by Cisco
Product Line: Cisco 4000 Series
Product Type: Integrated Services Router
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Title: Surplus

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Product Description

The ISR4431-V/K9 Cisco integrates voice capabilities with an aggregate throughput of 500 Mbps to 1 Gbps, supporting VoIP services. It is equipped with 3 10/100/1000 WAN or LAN ports, 4 RJ-45 ports, 4 SFP ports, 2 NIM slots, and an onboard ISC slot, in a 1 RU form factor that can be rack-mounted or wall-mounted. The device starts with 4 GB DDR3 memory and 8 GB flash memory, expandable to 32 GB flash memory, and operates within a voltage range of 100 VAC to 240 VAC.

FAQs for the ISR4431-V/K9

  • What is the aggregate throughput range of the networking hardware?
    The aggregate throughput ranges from 500 Mbps to 1 Gbps.
  • How many total onboard WAN or LAN ports does the device have?
    It has 3 onboard WAN or LAN 10/100/1000 ports.
  • Does the device support VoIP?
    Yes, VoIP support is included.
  • What are the default and maximum memory capacities?
    Both the default and maximum memory capacities are 4 GB DDR3.
  • How many RJ-45 and SFP ports are available?
    There are 4 RJ-45 ports and 4 SFP ports.
  • What form factors are supported by this device?
    The device supports Rack-Mount and Wall-Mount form factors.
  • Is there an onboard ISC slot available?
    Yes, there is 1 onboard ISC slot available.
  • What are the dimensions of the device?
    The device measures 1.7 inches in height, 17.3 inches in width, and 20 inches in depth.
  • How many NIM slots does the device have?
    It has 2 NIM slots.
  • What is the maximum flash memory supported?
    The maximum flash memory supported is 32 GB.

Product Review

The Cisco ISR4431-V/K9 offers a flexible throughput range of 500 Mbps to 1 Gbps, catering to varying network demands, and is equipped with a comprehensive set of ports including three WAN/LAN, four RJ-45, and four SFP ports, enhancing connectivity options. However, its limitation to 4 GB of non-upgradable DDR3 memory could constrain performance in high-demand scenarios. Additionally, the router supports VoIP and comes in a versatile form factor suitable for both rack-mount and wall-mount setups, making it adaptable to different installation environments.


The Cisco ISR4431-V/K9 is a versatile and high-performance router designed for medium to large-sized enterprises. This model, part of Cisco's Integrated Services Router family, offers advanced voice and data services. With its aggregate throughput ranging from 500 Mbps to 1 Gbps, the ISR4431-V/K9 efficiently handles high-bandwidth applications, ensuring smooth and reliable connectivity. This router is equipped with three onboard WAN or LAN 10/100/1000 ports, providing flexible connectivity options. Additionally, it features four RJ-45 ports and four SFP (Small Form-Factor Pluggable) ports, enabling the use of fiber optic connections for extended network reach and higher data transmission rates. The inclusion of two Network Interface Module (NIM) slots allows for further customization and expansion, accommodating a wide range of network modules for enhanced functionality. The ISR4431-V/K9 does not include Enhanced Service Module Slots but offers a single onboard Internal Service Module (ISC) slot for services integration. This capability allows for the deployment of applications directly on the router, optimizing performance and resource utilization. The router comes with a default memory of 4 GB DDR3, which is also the maximum supported memory, ensuring efficient processing of network tasks. Flash memory starts at 8 GB and can be expanded up to 32 GB, providing ample storage for the operating system, applications, and configurations. Expansion is a key feature of the ISR4431-V/K9, with a total of eight expansion slots available. This flexibility supports a wide range of add-ons and modules, making the router adaptable to evolving network requirements. The device is designed for both rack-mount and wall-mount installations, fitting into a 1 RU (Rack Unit) space, which makes it an ideal choice for space-constrained environments. Key features include: - VoIP support, enabling the router to manage voice over IP communications alongside traditional data traffic. - A wide range of AC input voltage (100 VAC to 240 VAC), ensuring compatibility with various power sources worldwide. - A UC (Unified Communications) license type, which facilitates the integration and management of voice, video, and data services. The physical dimensions of the ISR4431-V/K9 are practical for various installation scenarios, measuring 1.7 inches in height, 17.3 inches in width, and 20 inches in depth. This compact size, combined with its comprehensive features, makes the router a powerful and efficient solution for modern networking requirements. In summary, the Cisco ISR4431-V/K9 is a feature-rich router that offers reliable performance, flexible connectivity options, and expandable memory and storage. Its support for VoIP and capacity for services integration make it an excellent choice for businesses looking to streamline their communications and data networks. With its scalable design and advanced networking capabilities, the ISR4431-V/K9 is equipped to meet the demands of today's dynamic and complex network environments.


Item Number ISR4431-V/K9
Produced by Cisco
Included Voice Bundle Enabled
Comprehensive Throughput Range From 500 Mbps up to 1 Gbps
Integrated WAN/LAN Speed 10/100/1000 Mbps
Count of Ports 3
Ethernet Ports Count 4
Number of SFP Slots 4
NIM Slots Available 2
Service Module Slots - Enhanced Unavailable
Integrated Service Card Slot Present Yes
Initial Memory Capacity 4 GB DDR3
Peak Memory Support 4 GB DDR3
Base Flash Storage 8 GB
Flash Storage Upper Limit 32 GB
Additional Slot Count 8
Mounting Options Rack-Mount, Wall-Mount
Rack Units Compatibility 1 RU
Support for VoIP Supported
Token Ring Interface Not Supported
Minimum Input Voltage 100 VAC
Maximum Input Voltage 240 VAC
License Specification UC
Device Height 1.7 inches
Device Width 17.3 inches
Device Depth 20 inches

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