--- title: How we test carrier Ethernet services | TEST4NET description: "Leased Ethernet circuits on the CloudLAB bench: Y.1564 per service at CIR and EIR, policing, a 2-hour run, Y.1731 delay and loss checked against a reference" image: https://test4net.com/hubfs/blog-covers/how-we-test-carrier-ethernet-services.png --- [Skip to content](https://test4net.com/blog/how-we-test-carrier-ethernet-services#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-carrier-ethernet-services) - [Русский](https://test4net.com/ru/blog/how-we-test-carrier-ethernet-services) - [Հայերեն](https://test4net.com/hy/blog/how-we-test-carrier-ethernet-services) [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-carrier-ethernet-services) - [Русский](https://test4net.com/ru/blog/how-we-test-carrier-ethernet-services) - [Հայերեն](https://test4net.com/hy/blog/how-we-test-carrier-ethernet-services) 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) [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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The contract names a CIR per service, delay, loss and availability, for example 99.95%. The sheet says "passed" after one full-rate run or a ping, which does not show whether voice, video and data each get their CIR when all 3 run at once, whether the policer cuts at the right line, and whether the delay on the operator's portal is the delay your traffic sees. We answer these 3 questions for the operator handing the circuit over and for the customer signing the acceptance. ## The bench The generator sends one stream per service with its VLAN and marking, a sequence number and a timestamp in every frame. At the far end, a loopback with MAC swap is enough for rate, loss and round-trip delay. One-way delay and jitter need a second generator unit on a common clock from GPS or PTP. Our generators emulate PTP; a full analysis of the sync itself is a separate item agreed per project. Ports are 1G, 10G and 100G, 400G and faster per project. We work on the CloudLAB bench with your device, or on your circuit with our units at both ends. For OAM the generator plays the peer MEPs: CCM at the agreed interval, DMM and LMM at the service priority. A [WAN emulator](https://test4net.com/products/wanemu?hsLang=en) adds a known delay and a known loss, so each OAM figure has a reference. ## What we check - [Y.1564](https://test4net.com/methodologies/y-1564?hsLang=en) configuration test, service by service: 25, 50, 75 and 100% of CIR, then CIR + EIR, then 25% above that to prove the policer; IR, FTD, FDV and FLR at every step - Frame colour: green frames within CIR must arrive without loss, yellow frames above it may be dropped and are counted apart; CBS and EBS bursts when the SLA names them - Performance test: all services at their CIR together for 15 minutes, 2 hours or 24 hours, every metric per service per second - [Y.1731](https://test4net.com/methodologies/y-1731?hsLang=en) continuity: CCM at 3.3 ms or 100 ms, a link cut under traffic, the time to loss of continuity on the wire (the limit is 3.5 intervals) and RDI at the peer - Delay: two-way DMM/DMR and one-way 1DM at 0, 40, 80 and 95% background load, each figure next to the generator's own measurement on service frames in the same second - Loss: LMM/LMR on the service counters and SLM/SLR on synthetic frames, the emulator dropping a known 0.1%, then 1% - Faults across levels: loopback and linktrace per MIP, AIS from the operator level to the customer level, 2 vendors on one MEG ## What usually breaks Services that pass alone and fail together. A typical case: a 1 GbE UNI with voice, video and data, every configuration step clean. In the performance test, from the 38th minute, the data service loses 0.42% of its green frames. The 3 CIRs add up to 620 Mbit/s, while the policer on an aggregation node is set to 450 Mbit/s, a figure from an earlier version of the order. One service never reaches that line. All 3 together do. A portal that is right on an idle port. Without load a demarcation device reports 0.21 ms, the generator measures 0.20. At 80% load the device still reports 0.8 ms, the generator 4.1 ms on the service frames. The DMM frames went at PCP 7, the service at PCP 3, so OAM skipped the queue the customer was waiting in. One line of configuration, a rerun: 4.0 ms against 4.1. Round trip divided by 2. A loopback gives the round-trip delay, and the turn-up sheet halves it. When the 2 directions take different paths or carry different load, half of the round trip matches neither of them. If the SLA quotes one-way delay or jitter, the plan puts a second unit with a common clock at the far end. ## What is in the report A pass or a fail per service and per metric: IR offered against received at every step, green and yellow counts, FTD and FDV as min, average and max, FLR and available seconds. For OAM: the detection time per link cut, DM and LM from the device next to the reference at each load step, missed CCMs. One-second series as CSV and raw counters from both ends. The operator and the customer get one report and read the same numbers. ## Where to start Send us the service table or the SLA extract, the devices at both ends and the circuit topology. 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 provider or 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. 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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 5G transport: GTP-U, delay per class, a cut link](https://test4net.com/blog/how-we-test-5g-transport?hsLang=en) [Next article How we test VNFs: vCPUs, SR-IOV and a noisy neighbour](https://test4net.com/blog/how-we-test-virtual-network-functions?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 test hyperconverged clusters: a lost node and VM p99](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-hyperconverged-clusters.png?width=880&height=550&name=how-we-test-hyperconverged-clusters.png)](https://test4net.com/blog/how-we-test-hyperconverged-clusters?hsLang=en) [Storage and data center](https://test4net.com/blog/tag/storage-and-data-center) ### [How we test hyperconverged clusters: a lost node and VM p99](https://test4net.com/blog/how-we-test-hyperconverged-clusters?hsLang=en) An HCI sizing sheet answers one question: how many VMs fit on 4 nodes with one node in reserve. It is calculated on a healthy cluster. A buyer reads "N+1" and expects a l… ![](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 NAS over NFS and SMB: metadata calls and failover](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-nas-file-shares.png?width=880&height=550&name=how-we-test-nas-file-shares.png)](https://test4net.com/blog/how-we-test-nas-file-shares?hsLang=en) [Storage and data center](https://test4net.com/blog/tag/storage-and-data-center) ### [How we test NAS over NFS and SMB: metadata calls and failover](https://test4net.com/blog/how-we-test-nas-file-shares?hsLang=en) A NAS datasheet gives one figure: sequential read in GB/s, taken with large files and a few clients. On a home-directory share or a build farm, hundreds of clients create… ![](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 [![How we test backup and replication over WAN: the window and RPO](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-backup-and-replication-over-wan.png?width=880&height=550&name=how-we-test-backup-and-replication-over-wan.png)](https://test4net.com/blog/how-we-test-backup-and-replication-over-wan?hsLang=en) [Storage and data center](https://test4net.com/blog/tag/storage-and-data-center) ### [How we test backup and replication over WAN: the window and RPO](https://test4net.com/blog/how-we-test-backup-and-replication-over-wan?hsLang=en) The sizing sheet divides the data by the link: 20 TB over a 10G WAN is 4.4 hours, the window from 22:00 to 07:00 is 9, so the margin looks double. Over 30 ms of RTT with … ![](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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