PDF
Cellular Failover Design Guide
Dual-SIM and wired-to-cellular failover: detection timers, route metrics, and the acceptance tests that prove a switch actually completes.
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Featured Industrial IoT White Paper
Start with the reference design — if you read one document from this library, make it this one. Every other paper expands a single layer of it.
Featured
Industrial Cellular Network Architecture: A Reference Design
The four-layer reference design behind E-Lins deployments — field devices, edge connectivity, transport and platform — with the interface and redundancy options available at each layer.
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Industrial IoT White Paper Library
Nine engineering notes covering the decisions that most often go wrong in industrial connectivity projects.
PDF
5G RedCap for Industrial Devices
Where 5G RedCap sits against LTE Cat-4 and full 5G NR, and what it means for module cost, power budget and antenna design.
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PDF
Securing Remote Access to PLCs and HMIs
VPN choice (IPsec, OpenVPN, WireGuard), certificate handling, per-device firewall policy and how to audit remote sessions.
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PDF
RS232/RS485 to MQTT Integration Patterns
Register mapping, polling strategy, store-and-forward buffering for link loss, and payload conventions that keep integrations stable.
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PDF
Antenna Selection and Site Survey Handbook
Reading signal metrics correctly, choosing between omni and directional antennas, cable-loss budgets and how to document a survey.
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PDF
PoE Network Design for Industrial CCTV
PoE budgets, port counts, VLAN separation and bandwidth planning for camera backhaul over cellular where fibre is not available.
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PDF
Power, Enclosures and Environmental Ratings
Input voltage ranges, surge and isolation practice, IP and temperature ratings, and the installation mistakes that cause field failures.
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PDF
Fleet Connectivity: Telematics and Passenger Wi-Fi
Keeping vehicles online while they move: multi-carrier SIM strategy, GNSS integration, Wi-Fi onboarding and data-budget planning.
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White Paper Topics
Each paper is written to be usable on its own, without reading the rest of the library first.
Network architectureCellular failover5G & RedCapModbus / MQTTVPN & securityAntennas & RFPoE & CCTVPower & enclosuresFleet telematics
Frequently Asked Questions
White Paper FAQs
How the library is written, licensed and kept current.
Are the white papers free?
Yes — all E-Lins white papers are free to read and share. There is no paywall and no gated form. If you want the editable source files or a version adapted to your project, contact us and we will provide them.
Who writes them?
They are written by the E-Lins engineering and pre-sales teams, based on project work rather than marketing briefs. Where a paper describes a design pattern, it reflects topologies we have deployed in the field.
Can I use these documents in my own project documentation?
Yes — you are welcome to reference the diagrams and design patterns in internal or customer-facing documentation. A link back to the original page is appreciated but not required.
Do you publish papers on specific products?
The library focuses on design patterns and engineering practice rather than individual models. Product-level detail lives in the datasheets and manuals in the Support section.
Need a Paper for Your Project?
Tell us the design question your team is stuck on — we will point you at the right document or write the answer directly.