The Cisco CISCO3945/K9 Integrated Services Router (ISR G2) is a high-performance enterprise router designed to support branch offices, WAN edge deployments, unified communications, and secure multi-service networking. Powered by the Services Performance Engine 150 (SPE150), it delivers up to 150 Mbps of services-enabled throughput, enabling organizations to run voice, video, data, and security services simultaneously on a single platform.
Built on the Cisco 3900 Series ISR G2 architecture, the CISCO3945/K9 features a multi-gigabit internal fabric that provides high-speed communication between routing, security, and application services. The router includes 3 Gigabit Ethernet interfaces, including 2 combo RJ-45/SFP ports for flexible copper or fiber connectivity, making it suitable for diverse enterprise WAN and LAN environments.
Designed for long-term scalability, the Cisco 3945 offers extensive expansion capabilities with 4 Enhanced High-Speed WAN Interface Card (EHWIC) slots, 2 SM-X service module slots, 1 Internal Services Module (ISM) slot, and 4 DSP slots. This modular design allows organizations to add WAN interfaces, voice gateways, security services, storage, and application modules as business requirements evolve.
Running Cisco IOS Software, the router supports advanced enterprise networking technologies including IPv4, IPv6, BGP, OSPF, EIGRP, RIP, IS-IS, MPLS, Cisco Express Forwarding (CEF), Quality of Service (QoS), multicast routing, and advanced traffic management. Integrated security capabilities such as IPsec VPN, SSL VPN, DMVPN, Cisco IOS Zone-Based Firewall, Intrusion Prevention System (IPS), and hardware-based encryption acceleration help protect business-critical communications while enabling secure remote access.
The Cisco CISCO3945/K9 is also optimized for Cisco Unified Communications, supporting voice, video conferencing, collaboration applications, and WAN optimization through compatible service modules. Its 3U rack-mountable form factor and support for optional redundant power provide the reliability and availability required for mission-critical enterprise deployments.
Ideal for enterprise branch office routing, secure WAN connectivity, unified communications, VPN deployments, multi-service networking, and WAN edge infrastructure, the Cisco CISCO3945/K9 3900 Series Integrated Services Router with SPE150 delivers scalable performance, advanced security, and flexible expansion for modern enterprise networks.
Product Specifications – Cisco CISCO3945/K9 3900 Series Integrated Services Router (ISR G2) with SPE150
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| Specification |
Details |
| Product Name |
Cisco CISCO3945/K9 3900 Series Integrated Services Router (ISR G2) |
| Manufacturer |
Cisco Systems |
| Part Number |
CISCO3945/K9 |
| Product Series |
Cisco 3900 Series Integrated Services Router Generation 2 (ISR G2) |
| Product Model |
Cisco 3945 ISR G2 |
| Product Type |
Integrated Services Router |
| Performance Engine |
Services Performance Engine 150 (SPE150) |
| Architecture |
Modular ISR G2 Architecture with Multi-Gigabit Fabric |
| Routing Throughput |
Up to 150 Mbps (Services Enabled) |
| Embedded WAN/LAN Ports |
3 × Gigabit Ethernet Ports |
| Port Configuration |
2 × Combo RJ-45/SFP Gigabit Ethernet + 1 × RJ-45 Gigabit Ethernet |
| Console Ports |
1 × RJ-45 Console, 1 × Mini-USB Console |
| Auxiliary Port |
1 × RJ-45 AUX |
| USB Ports |
2 × USB 2.0 |
| Expansion Slots |
4 × Enhanced High-Speed WAN Interface Card (EHWIC) Slots |
| Service Module Slots |
2 × Enhanced Service Module (SM-X) Slots |
| Internal Services Module |
1 × Internal Services Module (ISM) Slot |
| DSP Slots |
4 × Digital Signal Processor (DSP) Slots |
| Flash Memory |
256 MB CompactFlash (Upgradeable) |
| DRAM Memory |
1 GB Standard, Expandable up to 4 GB |
| Multi-Gigabit Fabric |
Supported |
| VPN Support |
IPsec VPN, SSL VPN and DMVPN |
| Firewall Features |
Cisco IOS Zone-Based Firewall |
| Intrusion Prevention |
Cisco IOS IPS Support |
| Hardware Encryption |
Integrated Hardware Encryption Acceleration |
| Voice Support |
Cisco Unified Communications Ready |
| Video Support |
Supported |
| WAN Optimization |
Supported with Compatible Service Modules |
| Quality of Service (QoS) |
Advanced QoS and Traffic Prioritization |
| Routing Protocols |
BGP, OSPF, EIGRP, RIP, IS-IS and Static Routing |
| IPv4 Support |
Yes |
| IPv6 Support |
Yes |
| MPLS Support |
Supported |
| Multicast Routing |
Supported |
| Cisco Express Forwarding (CEF) |
Supported |
| SD-WAN Support |
Not Supported (Traditional WAN Architecture) |
| Operating System |
Cisco IOS |
| High Availability |
Supported |
| Management |
CLI, SNMP, Cisco Prime Infrastructure and Cisco IOS Management Tools |
| Power Supply |
Internal AC Power Supply |
| Redundant Power Support |
Supported with External Redundant Power System (RPS) |
| Form Factor |
3U Rack-Mountable |
| Rack Height |
3 Rack Units (3U) |
| Deployment Type |
Enterprise Branch, WAN Edge and Unified Communications |
| Region Variant |
Global |
| Application |
Enterprise Routing, Secure WAN, Voice, Video and Multi-Service Networking |
| Condition |
New / Refurbished / Cisco Certified |
| Use Cases |
Enterprise Branch Office Routing, Unified Communications (VoIP & Video Conferencing), Secure WAN and VPN Connectivity, Multi-Service Network Deployments |
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FAQs
Q1. What is the SPE150 in this router?
It is the Services Performance Engine that provides processing power and can be upgraded for higher performance.
Q2. How many ports does the Cisco 3945 have?
It includes 3 Gigabit Ethernet ports with flexible RJ45/SFP connectivity.
Q3. Is this router suitable for enterprise use?
Yes, it is designed for enterprise branch deployments with multiple services.
Q4. Does it support security features?
Yes, it supports VPN, firewall, IPS, and encryption capabilities.
Q5. Is this model still supported?
The Cisco 3900 Series has reached end-of-life, and newer ISR 4000 Series is recommended for modern deployments.
