In carrier-grade Ethernet and enterprise private line delivery scenarios, Ethernet test has become the core link to ensure SLA implementation. Network engineers must precisely control bandwidth commitments, excess traffic, and shaping mechanisms to enable stable concurrent services such as voice, video, and data. This article explains the core logic of CIR, EIR, and traffic shaping from an engineering practice perspective, and explains the on-site service quality verification scheme combined with the TFN T5500A 10G Ethernet Tester.
1. CIR, EIR and Traffic Shaping: The Three Core Elements of SLA
CIR (Committed Information Rate)is the guaranteed bandwidth agreed between the operator and the customer. The network must ensure low-latency and low-loss transmission at this rate under any load, corresponding to the rigid requirements of key services such as voice and industrial control. In Ethernet test, CIR is the benchmark threshold for judging whether the service meets the standard.
EIR (Excess Information Rate) is the elastic bandwidth beyond CIR. It can be used when the network is idle and is preferentially discarded when congestion occurs, suitable for non-critical traffic such as web browsing and file downloading. CIR + EIR constitutes the peak service bandwidth, and the two together define the bandwidth model of Ethernet services.
Traffic shaping is a QoS mechanism that smooths burst traffic and avoids interface congestion through algorithms such as token buckets. It ensures that CIR bandwidth is not occupied by excess traffic, controls the sending rhythm of EIR traffic, and reduces jitter and packet loss. It is the key to stabilizing SLA in multi-service bearer networks.
2. T5500A: An Ethernet Test Tool Supporting ITU-T Y.1564
The TFN T5500A is based on the FT100 intelligent platform, equipped with 10G Base‑X and dual Gigabit electrical/optical ports, and fully supports ITU‑T Y.1564. It is a professional instrument for on-site Ethernet test and verification of CIR/EIR/traffic shaping.
- – Supports single-port multi-service flows, simulates up to 512 flows at 10G, and accurately distinguishes CIR/EIR traffic
- – Supports color-aware and non-color-aware modes, matching live network QoS scheduling policies
- – Supports remote intelligent loopback, enabling end-to-end two-way Ethernet test with a single instrument
- – 6.5-inch outdoor high-brightness screen, battery life up to 12 hours, suitable for equipment room and field construction scenarios
3. Perform CIR/EIR/Traffic Shaping Testing with T5500A
3.1 Test Preparation
- – Hardware connection: Connect T5500A to the UNI port and set intelligent loopback at the remote end
- – Service flow configuration: Set CIR, EIR, CBS, EBS parameters according to SLA
- – Enable Y.1564 mode: Select service configuration test + performance test, enable two-way statistics
3.2 Service Configuration Test (Verify Single-Service Bandwidth Compliance)
- a. Send packets at CIR rate, test throughput, delay, packet loss, jitter – all items must pass
- b. Increase to CIR + 125% EIR to verify that traffic shaping takes effect; excess traffic should not occupy CIR bandwidth
- c. T5500A automatically outputs Pass/Fail to quickly locate bandwidth configuration errors
3.3 Service Performance Test (Verify Multi-Service Concurrent Stability)
- a. Send multiple flows at CIR rate simultaneously to simulate full load of the live network
- b. Conduct continuous tests for 15 minutes / 2 hours / 24 hours, monitor delay jitter and packet loss rate
- c. The instrument collects real-time KPI of each flow to judge whether traffic shaping and scheduling are fair and reliable
3.4 Engineering Value
- – Quickly accept Ethernet services such as private lines, mobile backhaul, and cloud networking
- – Locate hidden faults such as incorrect rate limiting, invalid shaping, and abnormal QoS scheduling
- – Generate standardized reports as the basis for SLA delivery and operation & maintenance
4. Summary
CIR, EIR and traffic shaping are the core pillars of Ethernet SLA, and Ethernet test is the last gateway to ensure service quality. With full Y.1564 functions, multi-flow simulation, and portability, TFN T5500A has become a standard tool for network engineers in on-site commissioning, acceptance, and troubleshooting. Accurate testing of CIR/EIR compliance and traffic shaping effects can truly achieve stable bearer and high-quality delivery of carrier-grade Ethernet.
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