Cisco CISCO1841 1841 Modular Router – 2x Fast Ethernet, 2 WAN Slots, 64MB Flash / 256MB DRAM
Cisco CISCO1841 1841 Modular Router is a professional Cisco 1800 Series router designed for branch offices, small businesses, and WAN networking environments. It features 2 × 10/100 Fast Ethernet ports, 2 modular WAN interface slots, 64 MB Flash memory, and 256 MB DRAM, providing flexible connectivity and expansion for routing and network infrastructure applications.
Description
The Cisco CISCO1841 is a modular enterprise router from the Cisco 1800 Series, designed to provide reliable routing and WAN connectivity for branch offices, small businesses, professional networks, and legacy Cisco infrastructure.
This configuration features two integrated Fast Ethernet interfaces, two modular WAN interface slots, 64 MB of Flash memory, and 256 MB of DRAM. Its modular architecture allows compatible WAN interface cards to be installed according to the connectivity requirements of the network.
Key Features
- Cisco 1841 Modular Router
- Cisco 1800 Series platform
- 2 × 10/100 Fast Ethernet ports
- 2 modular WAN interface slots
- 64 MB Flash memory
- 256 MB DRAM
- Modular architecture for flexible WAN connectivity
- Supports compatible Cisco WIC/HWIC interface modules
- Cisco IOS-based routing platform
- Designed for branch-office and small-business environments
- Suitable for legacy Cisco network infrastructure and training laboratories
Two Integrated Fast Ethernet Ports
The Cisco 1841 provides two integrated 10/100BASE-T Fast Ethernet interfaces for Ethernet network connectivity.
These interfaces can be used to connect the router to switches, local networks, upstream infrastructure, and other Ethernet-enabled networking equipment.
The integrated Ethernet connectivity reduces the need for additional LAN interface modules in typical deployments.
Two Modular WAN Slots
One of the key characteristics of the CISCO1841 is its modular WAN architecture.
The router provides two WAN interface slots, allowing compatible Cisco interface modules to be installed for different WAN connectivity requirements.
This modular design gives network administrators greater flexibility when deploying the router in environments where WAN technology or interface requirements may vary.
Compatible expansion options can include supported WIC/HWIC interface modules, depending on the intended deployment and Cisco compatibility requirements.
64 MB Flash and 256 MB DRAM
This particular configuration is specified with:
- 64 MB Flash memory
- 256 MB DRAM
Flash memory provides storage for the router’s operating software and related files, while DRAM is used for active operating-system functions, routing processes, and other runtime operations.
The 64/256 memory configuration provides a higher-memory configuration for the Cisco 1841 platform compared with the original base configuration.
Modular Network Architecture
The Cisco 1841 was designed around a modular architecture, allowing organizations to expand connectivity according to their network requirements.
The two WAN slots can accommodate supported Cisco interface modules, making the router adaptable to different WAN deployments.
This can be particularly useful for organizations maintaining existing Cisco infrastructure where compatibility with established interface modules is important.
Cisco IOS Platform
The CISCO1841 operates using Cisco IOS, Cisco’s established network operating system platform.
Depending on the installed IOS image and hardware configuration, Cisco IOS can provide routing, network management, security, and other network services.
The exact software features available on an individual unit depend on the installed IOS version and configuration.
Branch Office Networking
The Cisco 1841 is well suited to branch-office networking applications where a dedicated router is required to connect a local network to a WAN or larger corporate infrastructure.
Typical applications include:
- Branch-office routing
- Small-business WAN connectivity
- Remote-site networking
- Legacy network infrastructure
- Cisco networking laboratories
- Training and educational environments
- Network equipment replacement
Professional Connectivity
The combination of integrated Fast Ethernet interfaces and modular WAN expansion makes the CISCO1841 a practical platform for organizations that need configurable network connectivity.
The router can be positioned between a local Ethernet network and a WAN connection, providing routing and network services between different network segments.
Expansion and Integration
The two WAN slots allow the router to be integrated with compatible Cisco interface modules.
This modular approach can help organizations adapt the router to existing network infrastructure without replacing the entire chassis when a different supported WAN interface is required.
Ideal Applications
Branch Offices
Use the CISCO1841 as a routing platform for connecting branch networks to corporate WAN infrastructure.
Small Businesses
Provides a modular routing solution for smaller professional networks.
Legacy Infrastructure
Useful for maintaining or replacing equipment in existing Cisco 1800 Series environments.
Networking Laboratories
Suitable for hands-on Cisco IOS, routing, WAN, and network-infrastructure training.
IT Support & Spare Equipment
Can be maintained as replacement equipment for organizations operating compatible Cisco infrastructure.
Product Benefits
Flexible WAN Expansion: Two modular WAN slots provide options for adding compatible interface modules.
Integrated Ethernet: Two onboard 10/100 Fast Ethernet ports provide LAN connectivity without requiring additional Ethernet modules.
Enhanced Memory Configuration: The specified 64 MB Flash and 256 MB DRAM configuration provides additional memory capacity compared with the base CISCO1841 configuration.
Modular Architecture: Designed to adapt to different networking requirements through compatible expansion modules.
Cisco Platform: Built around Cisco’s IOS-based networking architecture.
Versatile Deployment: Suitable for branch offices, small businesses, legacy infrastructure, and network-training environments.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | Cisco |
| Series | Cisco 1800 Series |
| Model | CISCO1841 |
| Product Type | Modular Router |
| Integrated Ethernet | 2 × 10/100 Fast Ethernet |
| WAN Slots | 2 |
| Flash Memory | 64 MB |
| DRAM | 256 MB |
| WAN Expansion | Compatible WIC/HWIC modules |
| Operating Platform | Cisco IOS |
| Architecture | Modular |
| Primary Application | WAN & Branch Routing |
| Deployment | Branch Office / Small Business / Network Lab |
Connectivity Overview
LAN Connectivity:
2 × integrated 10/100 Fast Ethernet interfaces
WAN Expansion:
2 × modular WAN interface slots
Memory:
64 MB Flash / 256 MB DRAM
Software:
Cisco IOS, dependent on installed IOS image and configuration
Why Choose the Cisco CISCO1841?
The Cisco CISCO1841 provides a flexible routing platform for organizations that require modular WAN connectivity and integrated Ethernet networking.
Its combination of 2 Fast Ethernet ports, 2 WAN expansion slots, 64 MB Flash, and 256 MB DRAM makes this configuration suitable for maintaining compatible Cisco environments and supporting specialized networking requirements.
The modular design is particularly valuable for legacy installations, network laboratories, and organizations that already have compatible Cisco WAN interface modules.
Product Summary
The Cisco CISCO1841 1841 Modular Router is a Cisco 1800 Series networking platform featuring 2 × 10/100 Fast Ethernet ports, 2 modular WAN slots, 64 MB Flash memory, and 256 MB DRAM.
It is designed for professional routing applications including branch-office connectivity, WAN networking, legacy Cisco infrastructure, and network training environments. Its modular WAN architecture allows compatible interface modules to be used to extend connectivity according to deployment requirements.
Product Category: Networking → Routers → Modular Routers
Brand: Cisco
Series: Cisco 1800 Series
Model: CISCO1841
Product: 1841 Modular Router
Ethernet Ports: 2 × 10/100 Fast Ethernet
WAN Slots: 2
Flash: 64 MB
DRAM: 256 MB
Primary Application: Branch & WAN Routing
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