C1121-4P – 4×LAN PoE+ Ports – 1×GE/SFP Combo WAN – SD-WAN Router
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C1121-4P Description
The Cisco C1121-4P Integrated Services Router (ISR) is a high-performance, compact branch router designed to deliver secure, enterprise-class connectivity to small offices, retail sites, and managed remote work environments. Part of the C1120 sub-series, it features a powerful multi-core processor that offers significantly higher throughput than the entry-level C1110 models. It comes equipped with 4 Gigabit LAN ports supporting Power over Ethernet (PoE), allowing it to directly power IP phones and Wi-Fi access points, and dual WAN interfaces (1x GE and 1x GE/SFP Combo) for redundant connectivity.
Running on the advanced Cisco IOS XE operating system, the C1121-4P brings the full power of Cisco's intent-based networking to the edge. It supports Cisco SD-WAN, enabling intelligent path selection and application visibility to optimize cloud access. With integrated enterprise security features like Trust Anchor technology and encrypted traffic analytics, coupled with a fanless, silent design, this router provides a secure and unobtrusive solution for open-plan offices and noise-sensitive environments.
Product Highlights
Quick Specs
|
Feature |
Specification |
|---|---|
|
Model SKU |
C1121-4P |
|
WAN Interfaces |
1x GE + 1x GE/SFP Combo |
|
LAN Interfaces |
4x 10/100/1000 GE (PoE Capable) |
|
PoE Power Budget |
66 W (External 115W PSU) |
|
Integrated WiFi |
No (Data Only) |
|
Operating System |
Cisco IOS XE |
|
DRAM / Flash |
4 GB / 4 GB |
|
Processor |
Multi-core architecture |
|
Dimensions (H x W x D) |
1.65 x 12.7 x 9.03 in (4.2 x 32.3 x 23.0 cm) |
|
Form Factor |
Desktop / Fanless |
Key Features
Enhanced Throughput. The C1120 series, including the C1121-4P, utilizes a robust multi-core processor architecture. This delivers higher encrypted throughput and data plane performance compared to the entry-level C1110 models, ensuring smooth operation for bandwidth-intensive cloud applications and SD-WAN services in busy small offices.
Simplified Cabling. With a 66W PoE power budget, this router can drive power to connected devices directly through the LAN ports. It supports both 802.3af (PoE) and 802.3at (PoE+), enabling you to power and connect IP phones, security cameras, or a wireless access point without needing extra power bricks or a separate switch.
Intelligent Cloud Edge. Fully compatible with Cisco SD-WAN (vManage), this router allows for automated provisioning, application-aware routing, and centralized management. It optimizes traffic flow for SaaS applications like Office 365 and Salesforce, ensuring the best user experience regardless of the underlying transport link.
Trustworthy Systems. Features Cisco’s integrated security stack, including secure boot, hardware anchoring, and image signing. It supports advanced threat defense capabilities such as enterprise firewalling, IPS, and Encrypted Traffic Analytics (ETA) to protect the branch edge from sophisticated cyber threats.
Discreet Deployment. Designed with a passive cooling system, the C1121-4P operates completely silently. This makes it an excellent choice for deployment in noise-sensitive environments such as retail counters, medical clinics, or employee home offices where fan noise would be disruptive.
Unified Management. Runs the same IOS XE software found on larger Catalyst 8000 and ASR routers. This ensures feature consistency, operational simplicity, and support for open APIs (NETCONF/YANG), allowing IT teams to apply standardized policies and automation scripts across the entire network.
Application Scenarios
Executive Home Office. Ideal for senior executives or critical staff working from home who require a “corporate-office-in-a-box” experience. The C1121-4P provides a dedicated, secure VPN tunnel to HQ, powers a corporate IP phone via PoE, and ensures high-performance video conferencing without relying on consumer-grade gear.
All-in-One Branch. A perfect fit for retail stores needing reliable connectivity. The router manages the secure connection to payment processors via the WAN, while the PoE LAN ports power the Point-of-Sale (POS) terminal and a security camera, reducing the hardware footprint in the back office.
Secure M2M. Provides a secure, hardened connection for ATMs or self-service kiosks. The compact size fits easily inside cabinets, while the enterprise security features ensure that sensitive financial transaction data is encrypted and protected from tampering.
Product Comparison
|
Feature |
Cisco C1121-4P (Current Model) | ||
|---|---|---|---|
|
Performance Tier |
C1120 (Enhanced Performance) |
C1110 (Standard Performance) |
C1120 (Enhanced Performance) |
|
LAN Ports |
4x GE (PoE) |
4x GE (PoE) |
8x GE (PoE) |
|
WAN Interfaces |
1x GE, 1x Combo |
1x GE, 1x Combo |
1x GE, 1x Combo |
|
PoE Budget |
66 W |
66 W |
150 W (Requires 150W PSU) |
|
Processor |
Multi-core |
Single/Dual-core |
Multi-core |
|
Switching Capacity |
Higher (C1120 Series) |
Standard |
Higher (C1120 Series) |
|
Integrated Wi-Fi |
No |
No |
No |
|
Dimensions |
12.7 in Width |
12.7 in Width |
12.7 in Width |
|
Form Factor |
Fanless Desktop |
Fanless Desktop |
Fanless Desktop |
Selection Guide
- Performance Requirement
Select the C1121 (C1120 series) over the C1111 (C1110 series) if your branch office has higher bandwidth needs or runs complex encrypted VPNs. The multi-core processor in the C1121 provides significantly better throughput and SD-WAN performance. - Need for Power over Ethernet
Choose this “-4P” model if you need to power a local IP phone, Wi-Fi Access Point, or Security Camera directly from the router. If you do not need PoE, the standard C1121-4P data-only model offers cost savings (Note: Ensure you are viewing the specific SKU, as -4P denotes PoE capability). - Compact & Silent Deployment
This model is fanless and desktop-sized, making it the perfect choice for small offices, retail counters, or work-from-home setups where rack space is unavailable and noise is a concern. - WAN Redundancy
The dual WAN ports (1x Dedicated GE, 1x Combo GE/SFP) allow for primary and backup internet connections (e.g., Fiber + Broadband), ensuring business continuity if one link fails.
C1121-4P Rear Panel
|
1 |
Reset button |
2 |
Power switch |
|
3 |
4-pin power connector |
4 |
Ethernet switch |
|
5 |
RJ-45 stacked connector |
6 |
GE WAN 0/0/0 -RJ45 |
|
7 |
GE WAN 0/0/0 -SFP |
8 |
Micro-USB console |
|
9 |
USB 3.0 |
10 |
Kensington lock slot |
|
11 |
Grounding |
Optional Add-ons
|
Model Number |
Description |
|---|---|
|
ACS-1100-RM-19 |
Cisco 1100 Series Router Rack Mount Kit (19 inch) |
|
GLC-LH-SMD |
Cisco 1000BASE-LX/LH SFP transceiver module, SMF |
|
GLC-SX-MMD |
Cisco 1000BASE-SX SFP transceiver module, MMF |
|
CAB-CONSOLE-USB |
USB Console Cable 6 ft with Mini-B |
|
CAB-ETH-S-RJ45 |
Cisco Router Cable, RJ45 to RJ45, 6ft |
Specifications
Packaging weight and dimensions included:| Weight | 6.86 kg |
|---|---|
| Dimensions | 51 × 34 × 15.5 cm |
| Parameter | Details | Parameter | Details |
|---|---|---|---|
| Model SKU | C1121-4P | Series Family | Cisco ISR 1100 Series |
| WAN Interfaces | 1 x GE, 1 x GE/SFP Combo | LAN Interfaces | 4 x 10/100/1000 GE |
| PoE Capability | 2x PoE or 1x PoE+ supported | PoE Power Budget | 66W (with 115W PSU) |
| DRAM Memory | 4 GB | Flash Memory | 4 GB |
| Console Port | 1 x RJ-45, 1 x Micro-USB | USB Port | 1 x USB 3.0 Type A |
| Operating System | Cisco IOS XE | Processor | Multi-core architecture |
| SD-WAN Support | Yes | Bundled License | IP Base (Upgradable) |
| IPSec Throughput | High Performance (C1120 Platform) | VLANs | Supports 802.1Q VLANs |
| Power Supply | External AC Adapter (115W for PoE) | AC Input Voltage | 100 to 240 VAC |
| Dimensions (H x W x D) | 1.65 x 12.7 x 9.03 in | Weight | 3.4 lb (1.55 kg) |
| Fan Status | Fanless (0 dB noise) | Operating Temperature | 32°F to 104°F (0°C to 40°C) |
| Operating Humidity | 5% to 95% non-condensing | MTBF | 680,590 Hours |
| Safety Certifications | UL 60950-1, CAN/CSA C22.2 | EMC Certifications | FCC Part 15 Class A, EN 55032 |
Get More Information
Need pricing, stock, or shipping details for the C1121-4P ? Layer23-Switch can help you check current availability, lead time, and delivery options for this. Send us the part number, quantity, and destination country via live chat or email sales@layer23-switch.com for a fast quotation.
Quality Certifications
Customer Reviews
Questions & Answers
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What is C1121-4P used for?
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Does C1121-4P have LTE or 5G?
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How does C1121-4P compare with C1121-4PLTEP?
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What SD-WAN throughput is listed for C1121-4P?
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What autonomous routing throughput applies to C1121-4P?
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Does C1121-4P support optional PoE?
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How much memory does C1121-4P have?
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Is C1121-4P a firewall appliance?
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