​​What Is the C921-4PLTEAS Designed For?​​

The ​​Cisco Catalyst C921-4PLTEAS​​ is a ​​4G/LTE cellular router​​ built for environments requiring ​​failover connectivity​​ and ​​power-over-Ethernet (PoE+) support​​. It combines ​​dual-SIM LTE Advanced Pro​​ for cellular redundancy, ​​4 x Gigabit Ethernet ports with PoE+​​, and ​​Cisco SD-WAN integration​​, making it ideal for branch offices, retail sites, or industrial IoT deployments where wired WAN and power reliability are critical.

​​Key User Questions: Technical Insights​​

​​1. Why Integrate LTE and PoE+ in a Single Device?​​

The ​​dual-SIM LTE Advanced Pro​​ ensures uninterrupted internet access during primary WAN outages, while the ​​4 x PoE+ ports​​ (30W per port, 60W total) power devices like ​​IP cameras​​, ​​wireless APs​​, or ​​digital signage​​ without external injectors. ​​Bold takeaway​​: This router eliminates two infrastructure pain points—connectivity and power—in remote or temporary setups.

​​2. How Does Security Stand Out in Remote Deployments?​​

The C921-4PLTEAS supports ​​IPsec VPN​​, ​​MACsec encryption​​, and ​​Cisco Umbrella integration​​ to secure traffic over cellular networks. Unlike basic LTE routers, it also enforces ​​application-aware policies​​ via SD-WAN, blocking malicious activity before it reaches the network edge.

​​Performance and Reliability: Beyond Basic Connectivity​​

• ​​LTE Speeds​​: Supports ​​CAT 11 LTE​​ with peak download speeds of ​​600 Mbps​​, ensuring seamless failover for video surveillance or VoIP.
• ​​PoE+ Budget​​: Delivers ​​60W total PoE+​​, powering up to ​​4x devices​​ like ​​PTZ cameras​​ or ​​Wi-Fi 6 APs​​ simultaneously.
• ​​SD-WAN Ready​​: Integrates with ​​Cisco vManage​​ for centralized policy enforcement and real-time traffic optimization.

​​Where Should You Deploy the C921-4PLTEAS?​​

• ​​Retail Pop-Up Sites​​: Providing temporary LTE connectivity and power for POS systems and security cameras.
• ​​Oil and Gas Facilities​​: Ensuring uptime for sensors and SCADA systems in areas with unreliable terrestrial networks.
• ​​Construction Sites​​: Securely connecting trailers and mobile offices with PoE-powered APs and surveillance.

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​​C921-4PLTEAS vs. Competing Cellular Routers​​

While rivals focus on basic LTE failover, Cisco’s model excels with ​​SD-WAN integration​​ and ​​enterprise-grade PoE+​​. Competitors like Cradlepoint’s AER2200 lack native SD-WAN orchestration, requiring additional hardware for similar functionality.

​​A Field Engineer’s Practical Perspective​​

Deploying the C921-4PLTEAS in a hurricane-prone region highlighted its ​​dual-SIM failover​​ during fiber cuts, while the ​​PoE+ ports​​ kept emergency response cameras online despite grid outages. The ​​zero-touch provisioning​​ via vManage allowed remote configuration of 50+ sites in hours, not weeks. If you’re bridging the gap between connectivity and power in unpredictable environments, this isn’t just a router—it’s a lifeline for operational continuity.