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Product Description


Cisco® 4000 Series Integrated Services Routers (ISRs) form an intelligent WAN platform that delivers the performance, security, and convergence capabilities that today’s branch offices need.

Product Overview

The Cisco 4000 Series Integrated Services Routers (ISR) revolutionize WAN communications in the enterprise branch. With new levels of built-in intelligent network capabilities and convergence, the routers specifically address the growing need for application-aware networking in distributed enterprise sites. These locations tend to have lean IT resources. But they often also have a growing need for direct communication with both private data centers and public clouds across diverse links, including Multiprotocol Label Switching (MPLS) VPNs and the Internet.

Features and Benefits

Cisco 4000 Series ISRs provide you with Cisco Intelligent WAN (IWAN) software features and a converged branch infrastructure. Along with superior throughput, these capabilities form the building blocks of next-generation branch-office WAN solutions.

Cisco Intelligent WAN (IWAN)

Cisco IWAN is a set of intelligent software services that allow you to reliably and securely connect users, devices, and branch office locations across a diverse set of WAN transport links. IWAN-enabled routers like the 4000 Series dynamically route traffic across the “best” link based on up-to-the-minute application and network conditions for great application experiences. You get tight control over application performance, bandwidth usage, data privacy, and availability of your WAN links—control that you need as your branches conduct greater volumes of mission-critical business.

Cisco Converged Branch Infrastructure

The Cisco 4000 Series ISRs consolidate many must-have IT functions, including network, compute, and storage resources. The high-performance, integrated routers run multiple concurrent IWAN services, including encryption, traffic management, and WAN optimization, without slowing your data throughput. And you can activate new services on demand through a simple licensing change.

Table 1 breaks out many of the features and benefits of the Cisco 4000 Series that create an intelligent WAN and a converged branch infrastructure.

Table 1.       Cisco 4000 Series ISR General Feature Highlights

Business Requirement(s)



●  Throughput
●  Service reliability
●  Concurrent software services at speeds up to 2 Gbps. Backplane architecture supports high-bandwidth module-to-module communication at speeds up to 10 Gbps.
●  A distributed multicore architecture with the industry’s first internal services plane.
●  Remote installation of application-aware services, which run identically to their counterparts in dedicated appliances.

Lower WAN expenditures

●  Embedded IWAN solution for creating lower-cost, business-class Internet connections.


●  Performance upgrade model
●  Investment protection
●  CapEx budget management
●  Router capacity can be increased with a remote performance-on-demand license upgrade (no hardware upgrade) for exceptional savings.

Superior and secure user application experiences

●  ISR-AX “Application Experience” software bundle with advanced routing and network monitoring services.
●  Dynamic Multipoint VPN (DMVPN), zone-based firewalls, intrusion prevention (Snort and Umbrella Branch) and content management using Cisco Cloud Web Security and OpenDNS protecting data, providing authentication credentials, and enabling transmissions that are not backhauled through the data center.
●  Secure boot feature performs hardware-based authentication of the bootloader software to prevent malicious or unintended software from booting on the system.
●  Code signing verifies digital signatures of executables prior to loading to prevent execution of altered or corrupted code.
●  Hardware authentication protects against hardware counterfeiting by using an on-board tamper-proof silicon, including field replaceable modules. If authentication fails, the module is not allowed to boot.

IT consolidation, space savings, and improved total cost of ownership (TCO)

●  Single converged branch platform integrates routing, switching, virtual server, storage, security, unified communications, WAN optimization, and performance management tools.

Business continuity and increased resiliency

●  4400 Series models (4451 and 4431 ISRs) support dual integrated power supplies
for backup. The entire 4000Series supports optional power supply capable of
delivering additional PoE power to endpoints. Defined models provide for a DC power supply.
●  Modular network interfaces with diverse connection options for load-balancing and network resiliency.
●  Modular interfaces with online removal and insertion (OIR) for module upgrades without network disruption.
●  Cisco Unified Survivable Remote Site Telephony (SRST), which serves as a resiliency complement to Cisco Hosted Collaboration Solution (HCS), a Cisco cloud-based UC service.
●  Support for multiple, diverse access links: T1/E1, T3/E3, Serial, xDSL, Gigabit and Ten-Gigabit Ethernet.

Lower telephony costs with VoIP and rich media experiences

●  High-performance analog/digital gateway, allowing VoIP over less expensive Session Initiation Protocol (SIP) trunks.
●  Integrated IP PBX (Cisco Unified Communications Express) and Session Border Controller (Cisco Unified Border Element, or CUBE).

Easier manageability and support

●  Single, universal software image for all features and performance-on-demand licensing flexibility.
●  No additional services and support needed for compute and storage.
●  Supported by Cisco and third-party management tools, with programmability and automation.

Platform Architecture

Table 2 lists the primary hardware architectural features and benefits of the Cisco 4000 Series. The routers run modular Cisco IOS® XE Software, widely deployed in the world’s most demanding networks. The software’s comprehensive portfolio of services spans multiple technology areas, including security, WAN optimization, app and network quality of service (QoS), and embedded management.

Table 2.       Architectural Highlights

Architectural Features


Multicore processors

●  High-performance multicore processors support high-speed WAN connections. The data plane uses an emulated Flow Processor (FP) that delivers application-specific integrated circuit (ASIC)-like performance that does not degrade as services are added.

Embedded IP Security (IPsec) VPN hardware acceleration

●  Increases scalability. When combined with an optional Cisco IOS XE Software Security license, enables WAN link security and VPN services.

Integrated Gigabit Ethernet ports

●  The Cisco 4000 Series provides up to four built-in 10/100/1000 Ethernet ports for WAN or LAN.
●  Based on the platform, some of the 10/100/1000 Ethernet ports can support Small Form-Factor Pluggable (SFP)-based connectivity in addition to RJ-45 connections, enabling fiber or copper connectivity.
●  Optionally, depending on the platform, up to 30W PoE+ can be enabled on two of the built-in front panel Gigabit Ethernet interfaces to provide power to external devices such as fourth-generation (4G) LTE routers.
●  An additional dedicated Gigabit Ethernet port is provided for device management.[1]

USB-based console access

●  A mini type B USB console port1 supports management connectivity when traditional serial ports are not available.
●  Traditional console and auxiliary ports are also available.[2]

Optional integrated power supply for distribution of PoE

●  An optional upgrade to the internal power supply provides inline power (802.3af-compliant PoE or 802.3at-compliant PoE+) to optional integrated switch modules.
●  Redundant PoE conversion modules provide an additional layer of fault tolerance.

Optional integrated redundant power supply (RPS)

●  For the 4400 Series, power redundancy is available by installing an optional integrated RPS for decreasing network downtime and protecting the network from power failures.
●  Optional PoE boost mode increases total PoE capacity to up to 1000W.

Cisco Enhanced Services Module (SM-X)

●  Each service-module slot offers high data-throughput capabilityof up to 10 Gbps toward the system and up to 1 Gbps to other module slots.
●  Support for both single- and double-wide service modules provides flexibility in deployment options.
●  An SM-X slot can be converted into a Network Interface Module (NIM) slot using an optional carrier card.
●  Service modules support online insertion and removal (OIR), avoiding network disruption when installing new or replacement modules.1

Cisco Network Interface Modules (NIMs)[3]

●  Up to three integrated NIM slots on the Cisco 4000 Series allow for flexible configurations.
●  Each NIM slot offers options of up to two 2-Gbps connections, one toward the route processor and one for direct module-to-module communication. The 4221 ISR has only one 1-Gbps connection to the route processor.
●  NIMs support OIR.
●  Special NIMs add support for solid-state drives (SSDs) and hard disk drives (HDDs).1

Cisco Integrated Services Card (ISC) slot on motherboard

●  Integrated Services Card natively supports the new Cisco High-Density Packet Voice Digital Signal Processor Modules (PVDM4s), providing greater-density rich-media voice.
●  Each Integrated Services Card slot connects to the system architecture through an up to 2-Gbps link.
●  Future modules can be hosted on the Integrated Services Card slot, improving system functions.

Flash memory support

●  A single flash memory slot is available to support high-speed storage densities, upgradable to up to
32 GB. The 4221 ISR ships with a fixed 8 GB flash.
●  Two USB type A 2.0 ports provide capabilities for convenient storage.1


●  For the 4400 Series ISRs, the default control-plane memory is 4 GB, upgradable to 16 GB to provide additional scalability for control-plane features. The default data-plane memory is 2 GB.
●  For the 4300 Series ISRs, the default memory is 4 GB, upgradable to 16 GB (only 8 GB for the 4321) to provide additional scalability.
●  The 4200 Series comes with 4 GB fixed DRAM.

Managing Your Cisco 4000 Series ISRs

The Cisco network management applications listed at the top of Table 3 are standalone products that can be purchased or downloaded to manage your Cisco network devices. The applications are built specifically for the different operational phases; select those that best fit your needs. Those management capabilities listed under the “Cisco IOS Software XE Embedded Management” heading are directly integrated into the routers’ software operating system.

Table 3.       Network Management Solutions

Operational Phase



Device staging and configuration


●  A GUI-based device-management tool for Cisco IOS and Cisco IOS XE Software-based access routers. This tool simplifies routing, firewall, VPN, unified communications, and WAN and LAN configuration through easy-to-use wizards.

Network-wide deployment, configuration, monitoring, and troubleshooting

Cisco Prime®Infrastructure

●  Offers comprehensive lifecycle management of wired and wireless access, campus, and branch-office networks, rich visibility into end-user connectivity, and application performance assurance.
●  Provides wired lifecycle functions such as inventory, configuration, and image management; automated deployment; compliance reporting; integrated best practices; and reporting.

Staging, deployment, and changes to configuration and image files

Cisco Configuration Engine

●  A secure network management product that provides zero-touch image and configuration distribution through centralized, template-based management.

Context-aware security configuration and monitoring

Cisco Prime Security Manager

●  Management tool for configuring and managing context-aware security. The application supports both single- and multi-device manager form factors.
●  Provides the ability to write and enforce the granular context-aware security policies.

Cisco Wide Area Application Service (WAAS) management

Cisco WAAS Central Manager

●  The management tool for the WAAS1,[4] (WAN optimization and application acceleration) integrated service. It provides a centralized mechanism for configuring WAAS features, reporting, and monitoring.

Cisco IOS XE Software Embedded Management Capabilities



Cisco IOS Embedded Event Manager (EEM)

●  A distributed and customized approach to event detection and recovery.
●  Offers the ability to monitor events and take informational, corrective, or any desired EEM action when the monitored events occur or when a threshold is reached.

Cisco IOS XE IP Service-Level Agreements (IP SLAs)

●  Helps assure the performance of new business-critical IP applications as well as IP services that use data and voice in an IP network.

SNMP, Remote Monitoring (RMON), syslogNetFlow, IP Flow Information Export (IPFix)

●  Network monitoring and accounting tools.

Product Specifications

Table 4 lists the general product specifications for the Cisco 4000 Series routers.

Table 4.       Specifications of Cisco 4000 Series Integrated Services Routers

Technical Specifications

Cisco 4331

Aggregate Throughput

100 Mbps to

300 Mbps

Total onboard WAN or LAN 10/100/1000 ports


RJ-45-based ports


SFP-based ports


Enhanced service-module slots


Doublewide service-module slots


NIM slots


OIR (all I/O modules)


Onboard ISC slot


Default memory double-data-rate 3 (DDR3) error-correction-code (ECC) DRAM (Combined control/services/data planes)

4 GB

Maximum memory DDR3 ECC DRAM (Combined control/services/data planes)

16 GB

Default memory DDR3 ECC DRAM (data plane)


Maximum memory DDR3 ECC DRAM (data plane)


Default memory DDR3 ECC DRAM (control/services plane)


Maximum memory DDR3 ECC DRAM (control/services plane)


Default flash memory

4 GB

Maximum flash memory

16 GB

External USB 2.0 slots (type A)


USB console port -type B mini (up to 115.2 kbps)


Serial console port - RJ45 (up to 115.2 kbps)


Serial auxiliary port - RJ45 (up to 115.2 kbps)


Power-supply options

Internal: AC and PoE

Redundant power supply


Power Specifications

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)


Maximum power with AC power supply (watts)


Maximum power with PoE power supply (platform only) (watts)


Maximum endpoint PoE power available from PoE power supply (watts)


Maximum endpoint PoE power capacity with PoE boost (watts)


Sizes and Weights

(H x W x D)

1.75 x 17.25 x 17.25 in (44.45 x 438.15 x 438.15 mm)

External Power Supply Dimensions (H x W x D)


Shipping Box Dimensions

(H x W x D)

7.125 x 22.75 x 22.5 in (180.98 x 577.85 x 571.5 mm)

Rack height

1 rack unit (1RU)

Rack-mount 19in. (48.3 cm) EIA


Rack-mount 23in. (58.4 cm) EIA




Weight with 1, 450-WAC power supply (no modules)


Weight with 1 1,000-WAC power supply+ 1 PoE power module (no other modules)


Weight with AC PS (no modules)

13.5 lb (6.2 kg)

Weight with AC PS with POE (no modules)

14.1 lb (6.4 kg)

Typical weight (fully loaded with modules)

16.1 lb (7.3 kg)

Packaging Weight

4.6 lb (2.1 kg)


I/O side to bezel side

MTBF (Hours)


Environmental Specifications

Operating Conditions


32º to 104ºF

(0º to 40ºC)



0 – 6,560 ft.

(0 – 2,000 m)


(Rest of the world)

0 – 10,000 ft.

(0 – 3,050 m)

Relative humidity

5% to 85%

Short-term humidity

5% to 90%, not to exceed 0.024 kg water/kg of dry air

Acoustics: Sound pressure (Typical/maximum)

52.8/74.8 dBA

Acoustics: Sound power (Typical/maximum)

Warranty Information

Usually 1 Year warranty unless otherwise specified. Smartnet Support Contracts are usually available for Cisco products. Ask us to find out the benefits and cost

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