Time‑Sensitive Networking (TSN): Merging OT and IT for Real‑Time Industrial Ethernet

Time‑Sensitive Networking (TSN): Merging OT and IT for Real‑Time Industrial Ethernet

Operational Technology (OT) and Information Technology (IT) traditionally serve distinct real‑time requirements. OT traffic—such as machine‑control commands and sensor readings—demands deterministic delivery with fixed latency and minimal jitter. IT traffic, by contrast, is best‑effort and prioritizes throughput over strict timing.

Time‑Sensitive Networking (TSN) unifies these domains on standard Ethernet, delivering real‑time guarantees while preserving the simplicity and ubiquity of Ethernet cabling. By adding a deterministic layer to Ethernet, TSN reduces network delays, enforces predictable latency, and allows OT and IT packets to coexist on the same physical medium.

What Is TSN?

TSN is a family of IEEE standards that extends Ethernet to support time‑critical applications. Its architecture comprises three layers:

1. Foundational standards – the core IEEE specifications that define timing, scheduling, redundancy, and preemption.
2. Profiles – industry‑specific parameter sets that configure the foundational features for a particular application (e.g., IEC 60802 for industrial control).
3. Protocols – the actual data‑link layer implementations that carry the traffic.

Essential TSN Standards

• IEEE 802.1AS – builds on Precision Time Protocol (PTP) to synchronize all network devices to a common time base, enabling time‑aware scheduling.
• IEEE 802.1Qbv – introduces a time‑aware shaper that reserves specific time slots for packets, ensuring minimal jitter and predictable latency.
• IEEE 802.1CB – provides frame replication and elimination (FRER) for fault‑tolerant, redundant communication without burdening host CPUs.
• IEEE 802.1Qbu/802.1Qbr – support frame preemption and guard‑band allocation, allowing high‑priority frames to interrupt lower‑priority traffic while keeping cycle times stable.

For deeper technical details, consult the Fundamentals of Time‑Sensitive Networking white paper.

Enabling TSN with NXP Devices

NXP’s product lineup offers hardware and software support for the key TSN standards. The following table summarizes which devices implement which standards:

All three platforms—Layerscape LS1028A, i.MX RT1170, and i.MX 8M Plus—ship with comprehensive open‑source TSN drivers (including PTP), SDKs, and ready‑to‑run examples. They run Open Industrial Linux (OpenIL) or other real‑time operating systems, making them ideal for fast prototyping and long‑term deployment.

Device Highlights

Layerscape LS1028A

The LS1028A is a dual‑core Cortex‑A72 application processor tailored for automotive and industrial workloads. It integrates a hardware Ethernet switch that supports TSN over four ports, a CAN‑FD interface, an on‑chip GPU, and robust security features. Typical use cases include industrial routers, robotics, and industrial HMI.

i.MX RT1170

Featuring a dual‑core architecture—Cortex‑M7 up to 1 GHz and Cortex‑M4 up to 400 MHz—the i.MX RT1170 is among the fastest MCUs on the market. It offers up to 2 MB SRAM, three Ethernet interfaces, advanced security primitives, and optional 2D GPU acceleration, making it suitable for HMI, robotics, and low‑power industrial control.

i.MX 8M Plus

The i.MX 8M Plus delivers high‑performance machine‑vision and AI capabilities with a dedicated NPU (2.3 TOPS), multi‑interface CAN‑FD, and TSN‑capable Ethernet. It also features multiple 2D/3D graphics accelerators and inline ECC for reliability.

All three devices belong to NXP’s 15‑year longevity program, ensuring availability throughout the full product lifecycle—critical for safety‑critical and certification‑heavy applications.

TSN‑Based Demo Architecture

The demo illustrates how TSN‑capable devices can cooperate to deliver deterministic, synchronized operation:

• The i.MX 8M Plus performs image recognition with its ISP and NPU, generating real‑time control commands.
• The i.MX RT1170 receives those commands and drives a robotic arm to pick items from a conveyor belt.
• The Layerscape LS1028A acts as the TSN backbone, routing frames between the two edge devices and any additional nodes while preserving tight latency bounds.
• A laptop simulates best‑effort traffic to demonstrate TSN’s resilience under mixed workloads.

For a live demonstration, see Machine Learning and TSN with NXP’s i.MX 8M Plus.

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