The Cisco ISR4331/K9 is a versatile integrated services router designed to deliver advanced services to small to medium-sized enterprises and branch offices. It comes equipped with significant capabilities in terms of throughput, scalability, and security, making it a suitable choice for a wide range of networking requirements. The ISR4331/K9 offers a default aggregate throughput of 100 Mbps, which can be increased to 300 Mbps with a performance license. This scalability ensures that the router can meet the evolving demands of business networks. Additionally, it supports Class of Service (CEF) only throughput of over 3 Gbps, highlighting its efficiency in handling data packets. This router features a comprehensive set of ports and interfaces to accommodate various network configurations and expansions. It includes three onboard WAN or LAN 10/100/1000 ports, providing flexibility in connectivity. Of these, two are RJ-45 ports, and one is an SFP port, allowing for both copper and fiber connections. The ISR4331/K9 is designed to support future growth with two Network Interface Module (NIM) slots, enabling the addition of voice, video, data, and security services. It also includes one onboard ISC slot for further expansion.

• OIR (Online Insertion and Removal) support ensures minimal disruption during module changes.
• The router comes with 4 GB of DDR3 RAM by default, which can be expanded up to 16 GB to improve performance and support more complex operations.
• For storage, it starts with 4 GB of flash memory, upgradable to 16 GB, providing ample space for IOS and other software.

External connectivity options are robust, with two USB 2.0 Type A slots for storage and backup purposes, and one USB Type B Mini slot for console management. Additionally, the router features one serial console port and one serial auxiliary port, catering to a variety of management and configuration needs. The Cisco ISR4331/K9 is designed with power supply versatility in mind, supporting internal AC, DC, and PoE options. This flexibility ensures that the router can be deployed in diverse environments without the need for additional power converters. The AC input voltage range of 100 to 240 VAC makes it suitable for global use. Despite its capabilities, the router maintains a typical power consumption of only 65 W, underscoring its efficiency. With dimensions of 3.5 x 17.25 x 18.5 inches and a rack height of 1 RU, the ISR4331/K9 is compact enough for deployment in space-constrained environments while still delivering the performance expected from Cisco's ISR series. It operates within a temperature range of 0 °C to 40 °C, ensuring reliability in a variety of climatic conditions. In summary, the Cisco ISR4331/K9 integrates powerful networking capabilities into a compact, scalable, and efficient package. Its combination of throughput scalability, diverse connectivity options, and expansion capabilities make it an ideal solution for businesses looking to secure, scale, and streamline their network infrastructure.

Model Number	ISR4331/K9
Manufacturer	Cisco
Base Throughput	100 Mbps
Throughput with Performance License	300 Mbps
CEF-Only Throughput Capacity	Above 3 Gbps
Integrated WAN/LAN Ports	3
Ethernet Ports (RJ-45)	2
Small Form-Factor Pluggable (SFP) Ports	1
Enhanced Service Module (ESM) Slots	0
Service Module Slots for Doublewide	0
Network Interface Module (NIM) Slots	2
Online Insertion and Removal (OIR)	Supported
Internal Service Card (ISC) Slot	1
RAM (Standard)	4 GB DDR3
RAM (Maximum)	16 GB DDR3
Flash Memory (Standard)	4 GB
Flash Memory (Maximum)	16 GB
USB 2.0 Ports (Type A)	2
USB Mini-Type B Ports	1
Management Console Port	1
Auxiliary Port	1
Power Supply Variants	AC, DC, PoE (Internal)
AC Power Input	100 to 240 VAC
Power Consumption (Typical)	65 W
Dimensions (H x W x D)	3.5 x 17.25 x 18.5 inches
Operational Temperature Range	0 °C to 40 °C
Rack Units (RU)	1