How to Test 400G / 800G Electrical Receiver Conformance

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High-Performance Bit Error Ratio Tester
+ High-Performance Bit Error Ratio Tester
High-Performance Bit Error Ratio Tester
+ High-Performance Bit Error Ratio Tester

Using a BERT for 100 Gb/s-per-lane receiver calibration and conformance testing

400G / 800G electrical receiver conformance testing requires the application of a stressed signal, simulating the worst-case scenario from a compliant transmitter and channel. The receiver must effectively equalize and capture the signal, ensuring a bit error ratio below specified limits. Complicating the process for 100 Gb/s link receivers are the lower noise thresholds of 56 Gbaud PAM4 signals and forward error correction (FEC), which require additional tuning and testing. IEEE 802.3ck and OIF-CEI-5.0 define conformance testing standards for 100 Gb/s receivers used in 400G and 800G Ethernet networks.

Electrical receiver conformance testing begins with precise calibration of the stressed signal and system. Performance validation includes interference tolerance and jitter tolerance tests, ensuring 400G / 800G receiver conformance for all possible deployment scenarios. Chip-to-module interface testing uses the stressed-eye method, with separate calibrations for host and module inputs. For chip-to-chip, backplane, or cable interfaces, the conformance test involves tuning the link channel operating margin by means of broadband noise injection. The test setup requires a bit error ratio tester (BERT) with PAM4 pattern generation and a high-bandwidth, low-noise oscilloscope to calibrate the receiver and stress signal.

400G / 800G receiver compliance test with M8050A and UXR scope

400G / 800G electrical receiver conformance test solution

Conformance testing for 100 Gb/s receivers involves applying a stressed signal to simulate worst-case scenarios, requiring precise calibration and testing for interference and jitter tolerance. The Keysight 400G / 800G electrical receiver conformance test solution helps simplify physical layer conformance testing. It includes a 120 Gbaud BERT with high signal integrity performance and automated receiver test software. The software helps developers navigate complex compliance test requirements for the various links and automates testing to ensure repeatable, reliable results. The solution also includes a high-bandwidth, low noise Keysight Infiniium UXR-B Series oscilloscope and PAM4 analysis, jitter analysis, and signal integrity software to calibrate the receiver and FEC algorithm.
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