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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.
How to Test 400G / 800G Electrical Receiver Conformance
Pulse Amplitude Modulation PAM-N Analysis Software
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How to Test 400G / 800G Electrical Receiver Conformance
OIF Receiver Test Application for CEI-112G-VSR,-MR and -LR PAM4 interfaces
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How to Test 400G / 800G Electrical Receiver Conformance
Designed to assist and simplify the stress signal calibration used for testing the inputs of IEEE 802.3ck Draft 3.3 chip-to-chip (C2C) and chip-to-module (C2M) electrical interfaces using Keysight M8040A 64Gbaud Higher Performance BERT or an M8050A 120Gbd High-Performance BERT together with Keysight Digital Communication Analyzer (DCA) Oscilloscope or Infiniium UXR real-time Oscilloscope.
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Key Features | Automated stress signal calibration |
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How to Test 400G / 800G Electrical Receiver Conformance
EZJIT Software for 90000/V-/Z-/UXR-Series Oscilloscopes
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How to Test 400G / 800G Electrical Receiver Conformance
70 GHz, two-channel Infiniium UXR-Series real-time oscilloscope
Bandwidth | 70 GHz |
Max Memory Depth | 2 Gpts |
Max Sample Rate | 256 GSa/s |
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How to Test 400G / 800G Electrical Receiver Conformance
The Keysight M8050A high-performance bit error ratio tester (BERT) enables accurate characterization of receivers used in next-generation data center networks and server interfaces. With uncompromised signal integrity, support for NRZ, PAM4, PAM6, and PAM8 signals, and data rates up to 120 Gbaud, the flexible architecture of the M8050A supports 1.6T pathfinding as well as other leading-edge technologies.
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Additional resources for 400G / 800G electrical receiver conformance test
Conformance testing for electrical Ethernet links require bit error rate and forward error correction testing using a bit error ratio tester and high-bandwidth oscilloscopes. Learn how to prove receiver interoperability and conformance to IEEE and OIF specifications at 53 GBd PAM4 signaling using receiver compliance test tools to automate the process.
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