How to Test UALink Transmitter Compliance

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Confirm UALink 200 Gb/s PAM4 Transmitter Compliance

As UALink 1.0 enables high‑bandwidth, low‑latency scale‑up interconnects between AI accelerators, engineers must validate transmitter performance at 200 Gb/s PAM4 data rates where signal integrity margins are significantly reduced. Multi‑level signaling increases sensitivity to impairments such as random and deterministic jitter, amplitude noise, channel loss, crosstalk, and equalization mismatches. These effects place strict demands on oscilloscope bandwidth, noise performance, and measurement fidelity, requiring precise, repeatable electrical test setups to accurately characterize transmitter behavior across a wide operating envelope before system integration.

To complete UALink transmitter compliance testing, engineers must configure high‑bandwidth oscilloscope‑based measurement setups, capture PAM4 waveforms with sufficient fidelity, and evaluate electrical parameters explicitly defined by the UALink 1.0 specification and corresponding pass/fail limits. This includes eye mask compliance, eye height and width extraction, jitter decomposition, and PAM4 signal quality verification across multiple operating conditions, lanes, and test points. Results must be repeatable, traceable to specification requirements, and suitable for isolating root‑cause impairments when failures occur, enabling teams to resolve compliance issues before system‑level interoperability testing and deployment.

UALink Transmitter Compliance Test Solution

Validating UALink transmitters at 200 Gb/s PAM4 requires precise signal integrity measurements, strict adherence to specification‑defined limits, and efficient workflows that reduce setup variability while improving repeatability. Keysight’s UALink transmitter compliance solution combines a high‑bandwidth Infiniium oscilloscope with UALink transmitter compliance automation software to guide engineers through test setup, calibration, and execution while performing eye diagram analysis, jitter characterization, and PAM4 signal quality measurements aligned to UALink 1.0 requirements. By automating compliance workflows and correlating results directly to specification limits, the solution helps PHY and module developers rapidly identify failures, isolate root‑cause impairments, and accelerate readiness for system integration and interoperability testing.
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