Cisco C1121-4P - ISR 1100 4-Port Router, Dual GE WAN (1x SFP Combo), IOS XE - Cisco Refresh

The Cisco C1121-4P is part of the Cisco 1000 Series Integrated Services Routers (ISR 1000 Series), built to combine routing, integrated security, and flexible WAN connectivity in a single compact, fanless device. It features two Gigabit Ethernet WAN ports — one fixed copper GE port and one GE/SFP combo port that accepts an SFP module — plus four integrated Gigabit Ethernet LAN ports for direct connections to PCs, IP phones, and access points. The platform runs Cisco IOS XE Software and supports both standalone Autonomous mode and Cisco Catalyst SD-WAN (vManage) operation, depending on the IOS XE release and license installed. This unit is Cisco Refresh — Cisco's own Certified Remanufactured program, rebuilt with genuine Cisco parts and firmware to Cisco's own manufacturing standards.

Cisco C1121-4P - Key Features & Benefits

• Dual GE WAN Ports (1x SFP Combo): One fixed copper Gigabit Ethernet WAN port plus one GE/SFP combo WAN port — only the combo port accepts an SFP module — for copper or fiber uplinks on primary and backup connections.
• 4-Port Gigabit Ethernet LAN Switching: Four integrated 10/100/1000 LAN ports connect PCs, IP phones, and wireless access points directly to the router without a separate switch.
• Cisco IOS XE Software — Autonomous or SD-WAN Capable: The C1121-4P platform supports standalone Cisco IOS XE Autonomous mode as well as Cisco Catalyst SD-WAN (vManage) operation on a supported IOS XE release with the appropriate Cisco DNA/Network subscription license — see FAQ for version details.
• Cisco-Published Performance Ceiling: Cisco lists up to 1600 Mbps IPv4 forwarding throughput and up to 500 Mbps IPsec VPN throughput for this platform tier; encrypted throughput above Cisco's base license level requires an add-on performance license (see FAQ for details).
• Compact, Fanless 4GB DRAM/4GB Flash Design: Silent, small-office-ready chassis (1.65 x 10.80 x 7.85 in.) with 4GB DRAM and 4GB flash memory for reliable branch routing performance.

Cisco C1121-4P - Technical Specifications

• Manufacturer & Part Number: Cisco C1121-4P
• Product Type: ISR 1100 4-Port Integrated Services Router
• WAN Ports: 1x Gigabit Ethernet (copper only) • 1x GE/SFP combo (copper or fiber via SFP)
• LAN Ports: 4x 10/100/1000 Gigabit Ethernet (copper)
• Memory: DRAM: 4 GB • Flash: 4 GB
• Software Mode: Cisco IOS XE • Autonomous or SD-WAN capable • SD-WAN requires a supported IOS XE release + Cisco DNA/Network subscription (see FAQ)
• IPv4 Forwarding Throughput: Up to 1600 Mbps (Cisco-published, Autonomous mode)
• IPsec VPN Throughput: Up to 500 Mbps max (Cisco-published ceiling; license-dependent — see FAQ)
• Ports: 1x Micro-USB console port • 1x USB 3.0 Type-A port
• Power Supply: External 12VDC adapter, up to 66W (standard, non-PoE)
• Max Power Consumption: 18.8W (device only)
• PoE Support: Not standard • 802.3af/802.3at available only with optional ISR-1100-POE2 module + 115W PSU (2 PoE or 1 PoE+ ports)
• Dimensions: 1.65 x 10.80 x 7.85 in. (41.9 x 274.3 x 199.4 mm)
• Weight: 3.43 lb (1.55 kg)
• Operating Temperature: 0° to 40°C (32° to 104°F)
• Condition: Cisco Refresh (Certified Remanufactured)

Cisco C1121-4P - Frequently Asked Questions (FAQ)

• What's the difference between the C1121-4P and similar 1100 Series models?
  The C1121-4P is the 4-Port model with two Gigabit Ethernet WAN ports (1x copper-only, 1x GE/SFP combo) and no cellular module — not the C1121-8P (8 LAN ports) or the C1121-4PLTEP, which adds an LTE Advanced pluggable module for cellular WAN backup and draws more power (23.5W vs. 18.8W max). All three share the same 4GB DRAM/4GB flash and Cisco IOS XE software support.
• Does this router include a software license?
  The ISR 1000 Series platform ships from Cisco with IP Base as its default technology package, and Cisco's Refresh (Certified Remanufactured) program is intended to provide units with a valid, working Cisco IOS license. That said, the specific license tier and any optional feature licenses (SEC, APP, UC, VPERF, HSEC) active on this individual unit are not independently verified by us and can vary — Cisco Smart Licensing entitlements generally do not transfer automatically between owners. Confirm the license state with show license after receipt before relying on SD-WAN, Security, or higher-tier encryption throughput.
• How is this router powered, and does it support PoE?
  Standard power is an external 12VDC, 66W adapter — PoE is not included by default. The 4 LAN ports only support 802.3af PoE / 802.3at PoE+ (2 PoE or 1 PoE+ port) when the optional Cisco ISR-1100-POE2 module and its required 115W power supply are installed; confirm this hardware is present before assuming PoE will power your phones, cameras, or access points.
• Will I get the full 1600 Mbps / 500 Mbps throughput Cisco publishes for this model?
  Per Cisco's currently published documentation, IPv4 forwarding throughput (up to 1600 Mbps) is not license-gated, but IPsec VPN throughput is: the default IP Base + SEC license shapes encrypted throughput to 50 Mbps, the optional VPERF license raises this to 150 Mbps on 4-LAN-port ISR 1100 models, and only the HSEC license unlocks the full published maximum (up to 500 Mbps). Cisco's licensing terms and minimum software versions can change over time — verify current details and this unit's active license before sizing a deployment around these figures.

ATHQ is 100% US owned and operated, ensuring same-day shipping from our USA location. We pride ourselves in providing premium quality products at low prices! We always provide Satisfaction Guarantee to our customers. Please contact us if any issue arises.