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Cisco Integrated Services Router 4000 Family

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

The Cisco 4000 Family Integrated Services Router (ISR) revolutionizes WAN communications in the enterprise branch. With new levels of built-in intelligent network capabilities and convergence, it specifically addresses 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.

The Cisco 4000 Family contains five platforms: the 4451, 4431, 4351, 4331, and 4321 ISRs.

Business Requirement(s)



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 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, and Cisco Cloud Web security protect data, authentication credentials, and transmissions 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

ISR 4400 Series models (4451 and 4431 ISRs) support dual integrated power supplies
for backup. The entire ISR 4000 Family supports optional power supply capable of
delivering additional PoE power to endpoints.
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, and 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.

WAN connection

Ethernet WAN


Networking standardsIEEE 802.1Q,IEEE 802.1ag,IEEE 802.3,IEEE 802.3ah
Ethernet interface typeGigabit Ethernet
Ethernet LAN
Cabling technology10/100/1000Base-T(X)
Ethernet LAN data rates10,100,1000 Mbit/s
Full duplex

DSL features


Management features

Web-based management
Quality of Service (QoS) support
Reset button

Ports & interfaces

Ethernet LAN (RJ-45) ports5
USB ports quantity2
USB version2.0
RS-232 ports2
DC-in jack


Routing protocolsBGP,EIGRP,IS-IS,OSPF


Firewall securityZone based firewall (ZBFW)


Flash memory4000 MB
Internal memory4096 MB
Maximum memory card size16 GB
SafetyUL 60950-1, CAN/CSA C22.2 No. 60950-1, EN 60950-1, AS/NZS 60950-1, IEC 60950-1, GB-4943


Product colourBlack
Rack mounting
Rack capacity1U
LED indicators
On/off switch


Power consumption (typical)42 W
Power supply250 W
Power source typeAC,DC
AC input voltage100 - 240 V
AC input frequency47 - 63 Hz
Input current3 A

Operational conditions

Operating temperature (T-T)0 - 40 °C
Storage temperature (T-T)-25 - 70 °C
Operating relative humidity (H-H)5 - 90%
Storage relative humidity (H-H)5 - 95%
Operating altitude0 - 3050 m
Non-operating altitude0 - 4570 m

Weight & dimensions

Width438.1 mm
Depth438.1 mm
Height44.5 mm
Weight5 kg

Packaging data

Package width577.9 mm
Package depth571.5 mm
Package height181 mm

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