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CISCO1812/K9
Dual Ethernet Security Router with ISDN S/T Backup
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CISCO1812/K9 is a fixed, integrated services router engineered to deliver reliable performance for business and small business networks. It offers versatile power options with an AC power supply and built‐in redundancy to ensure continuous operation during critical network demands.
This router comes equipped with dedicated WAN and LAN interfaces that support 10/100 Ethernet technology and facilitates advanced integrated services such as voice and video. Modular expansion capabilities, robust VPN support including IPSec and SSL VPN options, high throughput performance with QoS features, and integrated firewall and intrusion prevention systems make the CISCO1812/K9 ideal for secure enterprise connectivity and unified communications use cases.
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| CISCO1812/K9 |  C1841-3G-S |  CISCO1812W-AG-C/K9 |  C1841-T1SEC-V2/K9 |  C1861-2B-VSEC/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Fixed | Fixed | Fixed | Fixed |
| Broadband | DSL | N/A | N/A | N/A | N/A |
| Built-in Security Features | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / IPSec VPN | Firewall, Intrusion Prevention, Malware Protection |
| Compliance Standards | IEEE802.3, IEEE802.3u, FCC, CE | FCC / CE / UL | FCC, CE | FCC, CE, UL | FCC, CE |
| Connectivity Type | Wired | Wired | Wired / Wireless | Wired | Wired |
| Depth | N/A | N/A | 11.0 inches | N/A | 14 inches |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | N/A | N/A | N/A | N/A |
| Ethernet Technology | 10/100 | 10/100 | 10/100 | 10/100 | 10/100 |
| Expansion Slots | EHWIC | EHWIC | EHWIC | EHWIC | NIM |
| Features | VPN, VoIP, IPv6 Compatible, Firewall, MPLS | VPN / VoIP / IPv6 Compatible / Firewall | VPN / IPv6 Compatible / Firewall / VoIP | VPN / VoIP / Firewall / IPv6 Compatible | VPN, Firewall, IPv6 Compatible, Voice, Video |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 256 MB | 128 MB | 128 MB | 128 MB |
| Form Factor | Rack-mount / Desktop | Desktop | Desktop | Rack-mount | Desktop |
| Height | N/A | N/A | 1.73 inches | N/A | 1.75 inches |
| High Availability Support | Supported | Not Supported | Not Supported | Supported | Supported |
| Integrated Services | Voice / Video | Voice / Video / WAN Optimization | Voice | Voice / Data / Security | Voice, Video, WAN Optimization |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 | RJ-45, SFP |
| LAN Ports | 4 LAN Ports | N/A | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 512 MB | 128 MB | 512 MB | 256 MB | 256 MB |
| Modular Slots Available | 1 Slot | 2 Slots | 1 Slot | 2 Slots | 2 Slots |
| Network Protocols | IPv4 / IPv6 | IPv4 / IPv6 | IPv4, IPv6 | TCP/IP | IP, VoIP |
| Power | 65W | 65W | 35W | 38 W | 85 Watt |
| Power Source | AC Power Supply / Redundant | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply |
| Product Name | CISCO1812/K9 Integrated Services Router | Cisco C1841-3G-S Integrated Services Router | CISCO1812W-AG-C/K9 | Cisco 1841 Integrated Services Router - T1SEC | Cisco C1861-2B-VSEC/K9 Integrated Services Router |
| Product Type | Integrated Services Router | Enterprise Router | Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | CLI / SNMP / Telnet / SSH | Telnet / SSH / SNMP | Telnet/SSH/SNMP | Telnet / SSH / SNMP | SSH, Telnet, SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / EIGRP / RIP / Static Routing | RIP / OSPF / EIGRP / BGP / Static Routing | OSPF / EIGRP / RIP / BGP |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | Fast Ethernet | N/A | N/A | N/A | Fast Ethernet |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | N/A | 0.025 Gbps | 0.025 Gbps | 0.033 Gbps | 15 Mbps |
| Use Case | Business / Small Business | Enterprise | Business | Enterprise | Business |
| VPN Support | IPSec / SSL VPN / DMVPN | IPSec | IPSec / SSL VPN | IPSec / SSL VPN | IPSec / SSL VPN |
| WAN Configuration | WAN | WAN | Dual WAN | WAN | Dual WAN |
| WAN Ports | 2 WAN | 1 WAN | 2 WAN | Modular WAN | 2 WAN |
| Weight | N/A | N/A | 9.1 lbs | N/A | 10 lbs |
| Wi-Fi Standard | N/A | N/A | WiFi 4 | N/A | N/A |
| Width | N/A | N/A | 17.0 inches | N/A | 17 inches |
| Wireless Support | No | No | Yes | No | No |
Dual Ethernet router with ISDN backup. Reliable performance keeps business-critical operations running smoothly.
Cisco 1812 ensures stable routing and secure connections. Backup options provide extra reliability for small offices.
Easy to deploy and manage. Handles office traffic efficiently with dependable backup support.
Stable Ethernet performance with ISDN failover. Ideal for branch office continuity.
Reliable dual Ethernet router. Cisco quality ensures secure and consistent network operations.
The Cisco 1812/K9 is a dual 10/100 Ethernet security router featuring integrated firewall, VPN, and ISDN S/T backup, designed for reliable small business connectivity.
Key features include dual Ethernet ports, Stateful Packet Inspection firewall, IPsec VPN, ISDN S/T backup interface, Cisco IOS, and comprehensive security services.
The Cisco 1812/K9 delivers up to 25 Mbps of stateful firewall throughput and 15 Mbps of IPsec VPN throughput for secure site-to-site connections.
It provides two 10/100 Ethernet LAN/WAN switch ports and one ISDN S/T backup port, plus an RJ-45 console port for out-of-band management.
ISDN S/T backup automatically switches traffic to the ISDN network when the primary WAN link fails, ensuring uninterrupted business connectivity.
Yes. Its compact design, essential security features, and failover support make it ideal for small to medium-sized enterprises requiring high availability.
It includes a Stateful Packet Inspection firewall, URL and content filtering, intrusion prevention, anti-malware, and Advanced Encryption Standard (AES) support.
Yes. It supports up to three concurrent IPsec VPN tunnels and GRE tunnels for secure remote access and site-to-site communications.
Management options include Cisco IOS CLI via console or SSH, Cisco Configuration Professional GUI, SNMP for monitoring, and Cisco Security Manager integration.
The router runs Cisco IOS Software, offering modular security, advanced routing protocols, and regular feature updates through Cisco software licensing.
Connect to the console port, use the Cisco IOS CLI setup wizard, configure WAN/LAN interfaces, apply security policies, and test failover functionality.
The Cisco 1812/K9 consumes 15 W, operates from 100–240 VAC, supports 0° to 40°C ambient temperature, and complies with RoHS and CE standards.
Cisco offers a one-year limited hardware warranty, 90-day software updates, and optional SMARTnet support for extended coverage and 24/7 access to TAC.
The fixed-configuration 1812/K9 does not accept expansion modules but supports standard RJ-45 and ISDN cables, power adapters, and rack-mount kits.
The Cisco 1812/K9 has been superseded by newer ISR 1000 Series models; limited support and replacement options are available through Cisco’s EOL policy.
Download the latest Cisco IOS image from the Cisco Software Download center and use TFTP or USB for a secure firmware upgrade via CLI.
The package includes the Cisco 1812/K9 router, power cord, RJ-45 rollover console cable, rubber feet, quick start guide, and licensing information.