What is an industrial cellular router?
An industrial cellular router is a piece of networking equipment that uses mobile networks (GPRS, EDGE, 3G, 4G LTE, 5G) to connect machines, PLCs, and industrial equipment to an IP network—whether local or in the cloud. Unlike a consumer-grade router, it is designed to operate continuously under harsh environmental conditions: extreme temperatures, mechanical vibrations, unstable power supplies, and exposure to dust.
The features that distinguish an industrial cellular router from consumer-grade equipment:
- Extended temperature range: -40°C to +75°C (vs. +0°C to +40°C for consumer products)
- Wide-range DC power supply: 9 to 36V DC (12V vehicle, 24V PLC) instead of 230V AC
- Fanless passive enclosure: no mechanical parts to maintain
- Multi-carrier dual SIM with automatic failover for high availability
- Cloud-based fleet management: remote configuration and monitoring of hundreds of routers
- Native industrial protocols: Modbus RTU/TCP, RS-485, integrated IoT gateway
GPRS, EDGE, 3G, and 4G LTE Compatibility: Why It’s Essential
When discussing cellular routers in an international B2B context, the terminology varies by country and network generation. In France and Europe, 4G LTE is dominant, but in many rural and industrial areas, as well as in emerging countries, only 3G, EDGE, or GPRS are available.
| Technology | Max Download Speed | Typical Use |
|---|---|---|
| GPRS (2G) | 114 Kbps | Alarms, low-volume data transmission |
| EDGE (2.75G) | 384 Kbps | Light telemetry, data SMS |
| UMTS/HSPA+ (3G) | 42 Mbps | VPN, SCADA monitoring |
| LTE Cat.4 (4G) | 150 Mbps | Remote access, video, full IoT |
| LTE Cat.12 (4G+) | 600 Mbps | Large file transfers, video surveillance |
The Eziwan cellular router automatically selects the best available technology at any given moment—no manual reconfiguration is required when traveling or changing coverage areas.
Network Architecture: How the Cellular Router Fits In
In a typical industrial IoT architecture, the cellular router is located at the junction between the OT (operational technology) network and the WAN (wide area network; Internet/cloud) network:
- Field side: RJ45 Ethernet ports (LAN) connected to PLCs, HMIs, industrial switches, and IP sensors. RS-485 port for legacy Modbus RTU devices.
- WAN side: cellular module with SIM(s) that establishes a connection to the Internet or to a private carrier access point.
- VPN tunnel: Outbound AES-256-encrypted connection to the Eziwan cloud or your on-premises VPN concentrator. No open inbound ports—Zero Trust architecture.
This topology allows you to remotely access your OT equipment from anywhere on your corporate network, without exposing your PLCs directly to the Internet.
M2M SIMs and eSIMs: Connectivity Options
The Eziwan cellular router supports all SIM configurations for industrial IoT deployments:
Physical M2M SIM cards: M2M nano-SIM cards from consumer mobile carriers (SFR Business, Orange Business, Bouygues Business) or IoT-specialized MVNOs. Recommended for fixed deployments with a single carrier.
Eziwan Multi-Carrier M2M SIM: A SIM card with permanent national roaming on Orange, SFR, Bouygues, and Free. Ideal for fleets of routers spread across the country. A single contract, no carrier dead zones.
eSIM (eUICC): A SIM card that can be reprogrammed remotely. The carrier profile is downloaded over the air from the Eziwan portal. Switching carriers without physical intervention—essential for hard-to-reach locations.
Dual SIM: Two SIM slots allow you to use two different carriers. Automatic failover in less than 8 seconds if the primary carrier fails.
Applications of the Industrial Cellular Router
The Eziwan industrial cellular router is deployed in a wide variety of sectors:
Industrial IoT and Industry 4.0: Connecting Siemens S7, Schneider Modicon, ABB, and Rockwell programmable logic controllers (PLCs) to the industrial cloud. Alarm reporting, real-time telemetry, and remote access to HMIs for preventive and corrective maintenance.
Precision Agriculture: weather stations, soil sensors, irrigation control, and silo monitoring in rural areas without fiber. The multi-carrier router ensures connectivity via 4G or 3G, depending on local coverage.
Energy Networks and Smart Grids: remote meter reading for Modbus meters (gas, water, electricity), substation monitoring, and control of EV charging stations. Cellular connectivity eliminates the need for fiber deployment at dispersed sites.
Transportation and Industrial Vehicles: forklifts, mobile cranes, construction vehicles. The router is resistant to vibrations and fluctuations in the vehicle’s battery voltage while maintaining connectivity while on the move.
Fleet Management: Monitoring Hundreds of Routers from the Cloud
One of the major advantages of an industrial cellular router over a consumer-grade solution is centralized fleet management. The Eziwan platform enables:
- Real-time monitoring: RSRP/RSRQ signal, WAN IP, uptime, data volume per router
- OTA firmware updates: simultaneous deployment across all or part of the fleet with cryptographic signing
- Remote configuration: modify APN settings, VPN rules, and firewall settings on 1 or 100 routers without on-site visits
- Alerts: immediate notification in the event of a connection loss, SIM failover, or data usage exceeding limits
- Remote reboot: restarts a frozen router without on-site intervention