--- title: "How we test TSN: critical traffic on a full link | TEST4NET" description: "TSN on the CloudLAB bench, per project: 802.1Qbv schedules, frame preemption, per-frame latency of the critical class while best effort fills the port" image: https://test4net.com/hubfs/blog-covers/how-we-test-tsn.png --- [Skip to content](https://test4net.com/blog/how-we-test-tsn#main-content) [![TEST4NET](https://test4net.com/hubfs/test4net-logo-fixed-2.svg)](https://test4net.com/?hsLang=en) - Services - Products - Resources - Company - [English](https://test4net.com/blog/how-we-test-tsn) - [Русский](https://test4net.com/ru/blog/how-we-test-tsn) - [Հայերեն](https://test4net.com/hy/blog/how-we-test-tsn) [News](https://test4net.com/news?hsLang=en) [Login](https://lab.test4net.com) [Support](https://test4net.com/support?hsLang=en) - [English](https://test4net.com/blog/how-we-test-tsn) - [Русский](https://test4net.com/ru/blog/how-we-test-tsn) - [Հայերեն](https://test4net.com/hy/blog/how-we-test-tsn) What we test By technology Industries [Load & Performance Testing Throughput, sessions and latency up to and past the rated limit](https://test4net.com/services/load-performance-testing?hsLang=en) [Functional & Conformance Testing Features against the spec, RFC compliance with evidence](https://test4net.com/services/functional-conformance-testing?hsLang=en) [Interoperability Testing Multi-vendor behaviour, before it reaches production](https://test4net.com/services/interoperability-testing?hsLang=en) [Security & Resilience Testing NGFW, IPS and VPN efficacy and performance with threats on the wire](https://test4net.com/services/security-resilience-testing?hsLang=en) [Test Plan & Methodology Design What to test, how, and what counts as a pass](https://test4net.com/services/test-plan-design?hsLang=en) [Test Automation & CI/CD Regression suites wired into your release pipeline](https://test4net.com/services/test-automation?hsLang=en) [Training Programs Hands-on courses for your test engineers](https://test4net.com/services/training-programs?hsLang=en) [Equipment Repair Repair and verification of test equipment](https://test4net.com/services/equipment-repair?hsLang=en) [All services](https://test4net.com/services?hsLang=en) [Routing & Switching RFC 2544 and RFC 2889 on real ports, 1G to 100G](https://test4net.com/solutions/routing-switching?hsLang=en) [Firewalls & NGFW RFC 9411 throughput with inspection switched on](https://test4net.com/solutions/firewalls-ngfw?hsLang=en) [Load Balancers & ADC Connections, TLS and failover of the pair under load](https://test4net.com/solutions/load-balancers-adc?hsLang=en) [SD-WAN & WAN Path selection and QoS under emulated WAN conditions](https://test4net.com/solutions/sd-wan?hsLang=en) [Cloud & NFV Virtual appliances and cloud services under load](https://test4net.com/solutions/cloud-nfv?hsLang=en) [5G & Mobile Core Transport and core functions under subscriber traffic](https://test4net.com/solutions/5g-mobile-core?hsLang=en) [Wi-Fi Wi-Fi 6 clients and access points, Wi-Fi 7 in progress](https://test4net.com/solutions/wi-fi?hsLang=en) [Storage & Infrastructure Storage networks and servers under realistic I/O](https://test4net.com/solutions/storage?hsLang=en) [AI / Switching Fabric (RoCEv2) Lossless Ethernet for GPU clusters: PFC, ECN, fabric load](https://test4net.com/solutions/ai-fabric-rocev2?hsLang=en) [All technologies](https://test4net.com/services#coverage) [Telecom Operators Pre-deployment acceptance and vendor comparison](https://test4net.com/solutions/industries#telecom) [Network & Security Vendors Independent validation of your product claims](https://test4net.com/solutions/industries#vendors) [System Integrators Proof for the customer before the rollout](https://test4net.com/solutions/industries#integrators) [Enterprise & Banks Upgrades and new platforms checked before production](https://test4net.com/solutions/industries#enterprise) [All industries](https://test4net.com/solutions/industries?hsLang=en) Not sure where to start? 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That line lists firmware features. The controller on that network needs its control frame in every cycle, every 1 ms for example, within a fixed delay bound, while a camera stream and a firmware download share the port. An average says nothing here. TSN is judged by its slowest frame, so we time every critical frame and hold the highest value against the budget. ## The bench TSN cases are built per project. The device under test is a TSN switch or a chain of two or three (an example; your design sets the hop count) on 1G or 10G ports. The generator plays the end devices. The critical class is a periodic stream with its VLAN priority (PCP), a sequence number and a timestamp in every frame, sent at the cycle and offset of your schedule. Best-effort streams from other ports fill the same egress up to line rate. Both ends sit on one generator, so the latency of every frame is read against one clock. The gate schedule works only while every hop agrees on the time. PTP is emulated on our generators, and we read the lock state from the switches under load. Time error in nanoseconds needs a dedicated timing analyser, which the bench does not have yet, so full timing analysis is agreed per project. PTP itself has [its own post](https://test4net.com/blog/how-we-test-ptp-and-time-sync?hsLang=en). ## What we check - Scheduled traffic (802.1Qbv): critical frames leave inside their gate window on every hop, on an idle port and with best effort at 100% - Delay per frame: maximum, 99.999th percentile and jitter of the critical stream against the budget per hop and end to end - Loss: zero lost or late critical frames over the whole run, counted by sequence number - Frame preemption (802.1Qbu, 802.3br): the wait a long best-effort frame adds to an express frame, preemption on and off, and whether both link partners really enable it - Guard band: the best-effort rate the port still delivers once the schedule takes its share - Stream reservation: a stream that does not fit is refused, and admitted streams keep their timing - Per-stream policing (802.1Qci): a talker above its reservation is cut off before it reaches the windows of other streams - Soak: 8 hours at full load (an example), since a drifting schedule shows up only as rare late frames Priority queues and shapers under TSN are covered in our [QoS post](https://test4net.com/blog/how-we-test-qos?hsLang=en). Pass criteria are written before the run: a maximum latency per hop, zero late frames. ## What usually breaks Preemption on one side only. The switch has it enabled, the link partner never confirms it, and the port silently falls back to waiting for the whole frame. A 1500-byte frame holds a 1G wire for about 12 µs. In a typical project the average latency of the critical class stays flat, while the maximum grows by exactly that amount on a small share of frames. A test that reports averages passes it. Second: an offset between hops. Each switch opens its gate on time by its own clock, and their base times differ by a little more than the window. The critical frame reaches the second hop just after the gate closed and waits a full cycle. The histogram gets a second peak exactly one cycle to the right. On the bench it shows within minutes; on a production line it looks like an occasional controller timeout. Third: marking at the edge. An end device sends untagged frames or the wrong PCP, the switch maps them into the critical class, and best effort starts using the protected window. Per-stream filtering catches this when it is configured, and often it is not. ## What is in the report Per stream and per hop: minimum, median, 99.999th percentile and maximum latency, jitter, lost and late frames, with the histogram. The same table with preemption on and off, and the best-effort rate left after the guard band. The lock state per switch and scenario, marked as a check with emulated PTP. Gate control lists, configuration, firmware and port plan, so the vendor can repeat any item. Fronthaul switches also go through the transport class of the [5G and mobile core](https://test4net.com/solutions/5g-mobile-core?hsLang=en) page. ## Where to start Send us the switch models, the firmware and the TSN design: streams, cycle times, gate schedules and the latency budget per stream. We answer with a draft test plan: the items, the bench layout and the dates. The report is yours to keep and to show to the vendor. [Write to us](https://test4net.com/contacts?hsLang=en) or look at [what else the bench does](https://test4net.com/services?hsLang=en). Share Pass it on to someone who runs a network Independent lab data is most useful in the hands of the people who make the call. Send this piece to a colleague. [LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-tsn) [X](https://twitter.com/intent/tweet?url=https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-tsn&text=How+we+test+TSN%3A+gate+schedules%2C+preemption%2C+worst-case+latency) [Telegram](https://t.me/share/url?url=https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-tsn&text=How+we+test+TSN%3A+gate+schedules%2C+preemption%2C+worst-case+latency) [WhatsApp](https://wa.me/?text=How+we+test+TSN%3A+gate+schedules%2C+preemption%2C+worst-case+latency%20https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-tsn) Copy link More apps ![](https://test4net.com/hubfs/IMG_0070.jpg) Written by ### [Alexander Zemskov](https://test4net.com/blog/author/az) Alexander Zemskov leads network and security testing at TEST4NET, an independent, vendor-neutral testing lab in Yerevan, Armenia. With 19+ years in performance and load testing on IXIA, Spirent, Keysight, Xena and Xinertel platforms, he runs NGFW, WAF, IPS, DLP and SASE evaluations for telecom operators, banks and system integrators. [LinkedIn](https://www.linkedin.com/in/azemskov/) [Website](https://test4net.com/?hsLang=en) [Previous article How we test multi-vendor interop: one RFC, two readings](https://test4net.com/blog/how-we-test-multi-vendor-interoperability?hsLang=en) [Next article How we test PoE: power budget, port priority and a lost PSU](https://test4net.com/blog/how-we-test-poe?hsLang=en) In this article On the bench ### Have a device to put through this? Send us the shortlist and the KPIs that decide it. We will come back with a scoped test plan, a timeline and a fixed price. [Talk to a test engineer](https://test4net.com/contacts?hsLang=en) Blog ## Keep reading [![How we measure power under load: watts per Gbps at 4 load steps](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-measure-power-under-load.png?width=880&height=550&name=how-we-measure-power-under-load.png)](https://test4net.com/blog/how-we-measure-power-under-load?hsLang=en) [Standards and methodology](https://test4net.com/blog/tag/standards-and-methodology) ### [How we measure power under load: watts per Gbps at 4 load steps](https://test4net.com/blog/how-we-measure-power-under-load?hsLang=en) The datasheet of a switch, router or firewall gives two power figures: "typical" and "maximum". Neither says at what load, with which optics or at what inlet temperature.… ![](https://test4net.com/hs-fs/hubfs/IMG_0070.jpg?width=22&height=22&name=IMG_0070.jpg) Alexander Zemskov Oct 30, 2026 · 5 min read [![How we test remote-access VPN: 9:00 logins, MFA and failover](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-remote-access-vpn.png?width=880&height=550&name=how-we-test-remote-access-vpn.png)](https://test4net.com/blog/how-we-test-remote-access-vpn?hsLang=en) [Security](https://test4net.com/blog/tag/security-performance) ### [How we test remote-access VPN: 9:00 logins, MFA and failover](https://test4net.com/blog/how-we-test-remote-access-vpn?hsLang=en) A VPN concentrator datasheet gives a user count and a throughput figure, both taken separately: thousands of idle tunnels for the first, a few fat ones for the second. A … ![](https://test4net.com/hs-fs/hubfs/IMG_0070.jpg?width=22&height=22&name=IMG_0070.jpg) Alexander Zemskov Oct 30, 2026 · 5 min read [![How we test IPv6 and transition: dual stack, NAT64, 464XLAT](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-ipv6-transition.png?width=880&height=550&name=how-we-test-ipv6-transition.png)](https://test4net.com/blog/how-we-test-ipv6-transition?hsLang=en) [Routing and switching](https://test4net.com/blog/tag/routing-and-switching) ### [How we test IPv6 and transition: dual stack, NAT64, 464XLAT](https://test4net.com/blog/how-we-test-ipv6-transition?hsLang=en) A router datasheet shows IPv6 as a tick next to IPv4, with one throughput figure for both. On the bench the two protocols often part ways: at small packets, with an exten… ![](https://test4net.com/hs-fs/hubfs/IMG_0070.jpg?width=22&height=22&name=IMG_0070.jpg) Alexander Zemskov Oct 30, 2026 · 4 min read [![TEST4NET LLC](https://test4net.com/hubfs/test4net-logo-fixed.svg)](https://test4net.com?hsLang=en) Independent testing and validation for telecom, information security and cloud infrastructure – real insights, not assumptions [mailto:sales@test4net.com](mailto:sales@test4net.com) #### Navigate - [Home](https://test4net.com/?hsLang=en) - [Why TEST4NET](https://test4net.com/why-test4net?hsLang=en) - [About us](https://test4net.com/about?hsLang=en) - [Contact](https://test4net.com/contacts?hsLang=en) - [Blog](https://test4net.com/blog?hsLang=en) - [Industry News](https://test4net.com/news?hsLang=en) #### Get in touch Sales [sales@test4net.com](mailto:sales@test4net.com) Support [support.test4net.com](https://support.test4net.com) © 2026 TEST4NET LLC. All rights reserved. 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