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Dual Ethernet router with V.92 modem backup. Provides dependable connectivity for small office networks.
CISCO1811/K9
Dual Ethernet Security Router with V.92 Modem Backup
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Name:
CISCO1811/K9
- Description:
- Dual Ethernet Security Router with V.92 Modem Backup
- Rating:
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- Brand:
- Cisco
- GTIN:
- 662445729498
- Condition:
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CISCO1811/K9 Overview
CISCO1811/K9 is a fixed-architecture integrated services router designed for small business and branch office deployments. It features multiple power options with an AC power supply, supports dual WAN configurations and provides dedicated LAN interfaces utilizing 10/100 Ethernet technology. The router integrates voice and VPN services while ensuring secure data traffic through built-in firewall and intrusion prevention offerings.
Featuring modular capabilities for future expansion via NIM slots, the CISCO1811/K9 offers efficient throughput and quality-of-service performance with a focus on reliable network connectivity. Its redundancy is managed through robust internal design, making it well-suited for use cases requiring secure VPN connectivity, voice services, and integrated network management in small and medium-sized enterprise environments.
CISCO1811/K9 price is is available on request. Get immediate quote.
Request bulk order quote for CISCO1811/K9 for additional pricing. Browse the full Router Isr 1800 series or explore all Cisco products.
CISCO1811/K9 Specifications
- Power Source
- AC Power Supply
- Flash Memory
- 256 MB
- Memory
- 512 MB
- Ethernet Technology
- 10/100
- Form Factor
- Desktop
- Weight
- N/A
- Height
- N/A
- Depth
- N/A
- Width
- N/A
- Product Type
- Enterprise Router
- Routing Protocols
- OSPF / BGP / EIGRP / RIP / Static Routing
- Architecture
- Fixed
- WAN Configuration
- Dual WAN
- WAN Ports
- 2 WAN
- Wi-Fi Standard
- N/A
- Connectivity Type
- Wired
- Remote Management
- Telnet, SSH, SNMP
- Compliance Standards
- FCC, CE
- Wireless Support
- No
- Firewall Features
- Yes
- Management
- Managed
- High Availability Support
- Not Supported
- Safety
- N/A
- EMC
- N/A
- Telecom
- N/A
- QoS Features
- Supported
- Expansion Slots
- NIM
- Stacking Capability
- No
- 5G Support
- No
- Interface Ports
- RJ-45
- Device Type
- Router
- Network Protocols
- IPv4, IPv6
- Broadband
- N/A
- Speed/Capacity
- N/A
- Modular Slots Available
- 1 Slot
- LAN Ports
- 4 LAN Ports
- Features
- VPN / VoIP / IPv6 Compatible / Firewall
- Use Case
- Small Business
- Integrated Services
- Voice
- Power
- 65 W
- VPN Support
- IPSec
- Built-in Security Features
- Firewall / Intrusion Prevention / Malware Protection
- Throughput Capacity
- 0.012 Gbps
- Product Name
- CISCO1811/K9 Integrated Services Router
CISCO1811/K9 Use Case
Branch Office Continuity with V.92 Failover
In a multi-location retail chain, the CISCO1811/K9-Dual Ethernet Security Router with V.92 Modem Backup provides primary broadband routing and automatic 56 kbps modem failover when DSL or cable WAN drops. This ensures uninterrupted POS transactions, maximizes uptime, and prevents revenue loss during primary link outages.
Secure Teleworker VPN Access for Remote Professionals
A consulting firm deploys the CISCO1811/K9-Dual Ethernet Security Router with V.92 Modem Backup at home offices to aggregate dual Ethernet links and establish IPSec VPN tunnels over broadband, automatically falling back to V.92 modem when needed. This delivers consistent, encrypted connectivity, enhances data protection, and boosts productivity for remote staff.
Out-of-Band Management for Critical Infrastructure
An energy provider uses the CISCO1811/K9-Dual Ethernet Security Router with V.92 Modem Backup to maintain secure out-of-band SSH and HTTPS access to substations if MPLS or fiber networks fail. This configuration accelerates remote troubleshooting, cuts field service costs, and enforces compliance with uptime SLAs.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 CISCO1811/K9 |  CISCO1841-ADSL2 |  CISCO1841-2SHDSL |  CISCO1803W-AG-B/K9 |  CISCO1841-4SHDSL | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Modular | Fixed | Fixed | Modular |
| Broadband | N/A | DSL | DSL | N/A | DSL |
| Built-in Security Features | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention | Firewall | Firewall / Intrusion Prevention |
| Compliance Standards | FCC, CE | IEEE 802.3, IEEE 802.3u | FCC / CE | IEEE 802.11b/g | FCC / CE / RoHS |
| Connectivity Type | Wired | Wired | Wired | Wired / Wireless / Ethernet | Wired |
| Depth | N/A | N/A | N/A | 10 inches | N/A |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | FCC / CE | N/A | N/A | FCC / CE |
| Ethernet Technology | 10/100 | 10/100 | 10/100 | 10/100 | 10/100 |
| Expansion Slots | NIM | NIM | NIM | NIM | EHWIC / NIM |
| Features | VPN / VoIP / IPv6 Compatible / Firewall | VPN / VoIP / IPv6 Compatible / Firewall | Voice / VPN / IPv6 Compatible / Firewall | VPN, Firewall, Integrated Services, IPv6 Compatible | VPN / IPv6 Compatible / Firewall |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 256 MB | 128 MB | 128 MB | 256 MB |
| Form Factor | Desktop | Desktop | Rack-mount / Desktop | Desktop | Rack-mount |
| Height | N/A | N/A | N/A | 1.5 inches | N/A |
| High Availability Support | Not Supported | Not Supported | Not Supported | Not Supported | Supported |
| Integrated Services | Voice | Voice / Video | Voice / N/A | Voice, Data | Voice / Video / WAN Optimization |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 | RJ-45 |
| LAN Ports | 4 LAN Ports | 2 LAN Ports | 2 LAN Ports | 4 LAN Ports | 2 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 512 MB | 128 MB | 256 MB | 256 MB | 128 MB |
| Modular Slots Available | 1 Slot | 2 Slots | 2 Slots | 1 Slot | 2 Slots |
| Network Protocols | IPv4, IPv6 | IP, TCP, UDP, ICMP | IPv4 / IPv6 / ICMP / TCP / UDP | IP, IPX, PPP, Frame Relay | IP / TCP/IP / UDP / ICMP / SNMP |
| Power | 65 W | 65 Watt | 95 W | 50 W | 65 W |
| Power Source | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply / Redundant |
| Product Name | CISCO1811/K9 Integrated Services Router | CISCO1841-ADSL2 | CISCO1841-2SHDSL | CISCO1803W-AG-B/K9 Integrated Services Router | CISCO1841-4SHDSL |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | Telnet, SSH, SNMP | Telnet, SSH, SNMP | Telnet / SSH / SNMP | Telnet, SSH, SNMP | Telnet / SSH / SNMP / HTTP/HTTPS |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / EIGRP / RIP / BGP / Static Routing | OSPF / EIGRP / RIP / Static Routing |
| Safety | N/A | N/A | N/A | N/A | UL |
| Speed/Capacity | N/A | N/A | N/A | Fast Ethernet | N/A |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | ITU-T G.992.3 | N/A | N/A | N/A |
| Throughput Capacity | 0.012 Gbps | 25 Mbps | 25 Mbps | 20 Mbps | 0.035 Gbps |
| Use Case | Small Business | Business | Enterprise / Small Business | Small Business / Branch Office | Enterprise / Business |
| VPN Support | IPSec | IPSec | IPSec / SSL VPN / N/A | IPSec / SSL VPN / N/A | IPSec |
| WAN Configuration | Dual WAN | Dual WAN | Dual WAN | Dual WAN | WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | 2 WAN | 4 WAN |
| Weight | N/A | N/A | N/A | 11 lbs | N/A |
| Wi-Fi Standard | N/A | N/A | N/A | WiFi 2 | N/A |
| Width | N/A | N/A | N/A | 17.5 inches | N/A |
| Wireless Support | No | No | No | Yes | No |
Reviews & Ratings
D
David Adams
4
Cisco 1811 ensures stable routing and secure connections. Backup modem adds extra reliability.
S
Sophia Walker
5
Easy to deploy and manage. Performs well under daily office workloads.
B
Benjamin Young
3
Reliable dual Ethernet performance and backup support. Ideal for branch office deployments.
J
James White
4
Consistent uptime and stable routing. Cisco 1811 keeps our network secure and operational.
Questions & Answers
What is the Cisco 1811/K9 Dual Ethernet Security Router with V.92 Modem Backup?
The Cisco 1811/K9 is a compact branch router offering dual 10/100 Mbps Ethernet interfaces, integrated security features, and a V.92 PSTN modem for reliable dial-up backup connectivity.
Which security features are built into the Cisco 1811/K9 router?
It includes Stateful Packet Inspection (SPI) firewall, Intrusion Prevention System (IPS), and VPN capabilities with IPsec encryption for secure site-to-site and remote access.
How does the V.92 modem backup function work on the Cisco 1811/K9?
Upon primary link failure, the integrated V.92 modem automatically dials a configured PSTN number to restore internet connectivity within seconds.
What throughput performance can I expect from the Cisco 1811/K9?
With hardware-accelerated encryption, it delivers up to 35 Mbps of IPsec VPN throughput and up to 25 Mbps of firewall performance.