With the in-depth development of Industry 4.0 and intelligent manufacturing, enterprises have increasingly higher requirements for network connectivity. Traditional industrial network architectures are gradually revealing their limitations when facing demands such as multi-site interconnection, real-time data transmission, and flexible expansion. The emergence of SD-WAN (Software-Defined Wide Area Network) technology has brought revolutionary changes to industrial networks. T

Redundancy Design Solutions in Industrial Routers and Cellular Communication Devices Table of Contents 1. Introduction: Why Do Cellular Communication Devices Need "Redundancy"? 2. Fundamental Concepts 2.1 What is Single Module Single SIM 2.2 What is Single Module Dual SIM (Dual SIM Single Module) 2.3 What is Dual Module (Dual Module / Dual Modem) 3. Detailed Working Principles of Single Module Dual SIM 3.1 SIM Card Switching Mechanism 3.2 Switching Latency Analysis 3.3 Techn