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CISCO881G-S-K9
881G FE Sec Router bundle with Adv IP Serv, 3G Sprint
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CISCO881G-S-K9 is a fixed enterprise router designed for small business environments that delivers integrated routing, switching, and security functions. It features an AC power supply, a single dedicated WAN port paired with four LAN ports operating at 10/100 Ethernet speeds, and built-in services including voice, video, and WAN optimization—all optimized for secure VPN connectivity and robust performance.
CISCO881G-S-K9 excels in delivering up to 0.15 Gbps throughput with advanced firewall and IPS capabilities, while its fixed architecture ensures reliable operation and cost-effective deployment. Although it does not offer modular expansion options, its integrated services and managed interface features make it an ideal solution for small business use cases requiring dependable connectivity and redundancy.
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A national retail chain deploys the CISCO881G-S-K9-881G FE Sec Router bundle with Advanced IP Services and 3G Sprint at each storefront to deliver primary broadband plus instant 3G failover. Integrated Cisco firewall, VPN and WAN optimization ensure PCI-compliant, uninterrupted POS transactions and seamless inventory synchronization. Outcome: 99.99% network uptime, zero revenue loss during outages and reduced IT support costs.
A manufacturing company uses the CISCO881G-S-K9-881G FE Sec Router bundle with Advanced IP Services and 3G Sprint to connect dispersed sensor arrays and PLC controllers over encrypted VPN tunnels. The router’s integrated firewall, dynamic routing (EIGRP/OSPF) and cellular failover enable real-time telemetry and predictive maintenance from central SCADA servers. Outcome: 30% reduction in unplanned downtime, improved asset utilization and lower maintenance overhead.
A public safety agency outfits mobile command units with the CISCO881G-S-K9-881G FE Sec Router bundle with Advanced IP Services and 3G Sprint for on-the-move, secure voice/data links to headquarters. The solution’s fast-boot capabilities, stateful inspection firewall and DMVPN support deliver encrypted communications even in infrastructure-challenged environments. Outcome: Accelerated incident coordination, enhanced responder safety and reliable mission-critical data exchange.
To get the detailed certification, please go to the Compliance Center.
 CISCO881G-S-K9 |  CISCO888W-GN-E-K9 |  C888-K9 |  CISCO878-K9 |  CISCO861-K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Fixed | Modular | Fixed | Fixed |
| Broadband | N/A | N/A | Fiber Optic / DSL | N/A | DSL |
| Built-in Security Features | Firewall, Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention |
| Compliance Standards | FCC, CE | IEEE 802.3, IEEE 802.11, FCC, CE | FCC, CE, RoHS | FCC, CE | FCC / CE / RoHS |
| Connectivity Type | Wired | Wired / Wireless / Ethernet | Wired | Wired / Wireless | Wired |
| Depth | 7.48 inches | 18.5 inches | 14 inches | 7.5 inches | 7.0 inches |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | N/A | CE Certified | N/A | N/A |
| Ethernet Technology | 10/100 | 10/100/1000 | 10/100/1000 | 10/100 | 10/100 |
| Expansion Slots | N/A | NIM / SFP+ | SFP+ | N/A | N/A |
| Features | VPN, Voice, Security, Firewall, IPv6 Compatible | VPN, VoIP, IPv6 Compatible, Firewall | VPN, Firewall, IPv6 Compatible | VPN / IPv6 Compatible / Firewall / QoS | VPN / Firewall / IPv6 Compatible |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 128 MB | 256 MB | 512 MB | 128 MB | 128 MB |
| Form Factor | Desktop | Rack-mount | Rack-mount | Desktop | Desktop |
| Height | 1.44 inches | 1.7 inches | 1.75 inches | 1.0 inches | 1.0 inches |
| High Availability Support | Not Supported | Supported | Supported | Not Supported | Supported |
| Integrated Services | Voice, Video, WAN Optimization | Voice / Video / WAN Optimization | Voice, Video, WAN Optimization | Voice / Video / WAN Optimization | Voice / Video / WAN Optimization |
| Interface Ports | RJ-45 | RJ-45 / SFP | RJ-45, SFP | RJ-45, Combo Ports | RJ-45 |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 256 MB | 512 MB | 4 GB | 256 MB | 256 MB |
| Modular Slots Available | N/A | 1 Slot | 2 Slots | N/A | N/A |
| Network Protocols | IPv4, IPv6 | TCP/IP, UDP, ICMP, SNMP | IPv4, IPv6, MPLS, VPN | IPv4, IPv6 | IPv4 / IPv6 |
| Power | 24 W | 65 Watt | 150 Watts | 48W | 60W |
| Power Source | AC Power Supply | AC Power Supply | AC Power Supply / Redundant | AC Power Supply | AC Power Supply |
| Product Name | Cisco 881G-S-K9 | CISCO888W-GN-E-K9 | C888-K9 Enterprise Router | CISCO878-K9 | CISCO861-K9 Integrated Services Router |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Integrated Services Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | Telnet, SSH, SNMP | SSH, Telnet, SNMP | SSH, Telnet, SNMP | Telnet, SSH, HTTP, HTTPS | Telnet / SSH / SNMP |
| Routing Protocols | OSPF, EIGRP, RIP, BGP, Static Routing | OSPF / BGP / EIGRP / Static Routing | OSPF / BGP / Static Routing | OSPF / BGP / RIP / Static Routing | OSPF / EIGRP / RIP / Static Routing |
| Safety | N/A | N/A | UL Listed | FCC | N/A |
| Speed/Capacity | N/A | Gigabit | Gigabit | N/A | Fast Ethernet |
| Stacking Capability | No | Yes | Yes | No | No |
| Telecom | N/A | N/A | FCC Part 15 | N/A | N/A |
| Throughput Capacity | 0.15 Gbps | 1 Gbps | 2 Gbps | 0.05 Gbps | 25 Mbps |
| Use Case | Small Business | Enterprise / Small Business | Enterprise | Business / Small Business | Small Business / Enterprise |
| VPN Support | IPSec | IPSec / SSL VPN | IPSec / SSL VPN | IPSec VPN | IPSec / SSL VPN |
| WAN Configuration | WAN | Dual WAN | Dual WAN | WAN | WAN |
| WAN Ports | 1 WAN | 2 WAN | 2 WAN | 1 WAN | 1 WAN |
| Weight | 4 lbs | 11.88 lbs | 7 lbs | 4 lbs | 4 lbs |
| Wi-Fi Standard | N/A | WiFi 4 | WiFi 6 | WiFi 4 | N/A |
| Width | 8.66 inches | 17.2 inches | 17 inches | 9.0 inches | 8.5 inches |
| Wireless Support | No | Yes | No | Yes | No |
The Cisco 881G-S-K9 router with 3G backup and advanced IP services is perfect for small to medium-sized businesses. It's reliable, secure, and offers high-speed connectivity.
Great performance with 3G backup. Cisco 881G-S-K9 ensures fast and secure internet connectivity for our remote office and has been highly reliable.
The Cisco 881G-S-K9 provides solid performance with 3G backup. It's a great security router that ensures continuous connectivity for our business needs.
Cisco 881G-S-K9 is perfect for securing our network. With 3G backup and advanced IP services, it's been a reliable and easy-to-manage solution.
Cisco 881G-S-K9 delivers great security with high-performance routing. The 3G backup ensures we stay connected during internet disruptions, making it ideal for our business.
The Cisco 881G-S-K9 bundle is an integrated SEC router with 4 Fast Ethernet ports, Advanced IP Services, and 3G Sprint USB broadband support for secure, high-availability branch connectivity.
It offers one built-in 3G Sprint USB dongle interface plus four Fast Ethernet (10/100) LAN ports and one Fast Ethernet WAN port for versatile network deployment.
Advanced IP Services delivers enterprise-grade features—dynamic routing, MPLS, QoS, and NAT—enabling scalable VPNs, traffic prioritization, and high-performance WAN optimization.
Yes. The embedded 3G Sprint USB modem automatically fails over to cellular when the primary WAN link drops, ensuring continuous network availability and business continuity.