400G PAM4 electrical testing, automated

400G PAM4 electrical testing, automated

New Products |
By Graham Prophet

The automated turnkey solution performs PAM4 compliance test sweeps in a single pass for shorter test times, more reliable and repeatable results, and greater ease of use. The TekExpress 400G-TXE solution panel (user interface) contains sequentially ordered tabs that help guide through the test setup and execution process of the OIF-CEI-56G-VSR, OIF-CEI-56G-MR, and OIFCEI-56G-LR specific standardized tests.


The use of PAM4 encoding doubles the data rate of serial data channels compared to NRZ (non-return to zero). But as a complex modulation scheme it also presents a number of major test and measurement challenges. Many of the measurement specs for PAM4 are still in flux, making it difficult to stay current with the latest measurement techniques being formalized by the standards. The time required to complete complex test procedures can be a significant challenge along with the need for reliable results that can be correlated across test systems.


“By automating the PAM4 testing on our DPO70000SX Oscilloscopes, we are delivering easy-to-use turnkey test solutions our customers need to make the move to 400G,” said Brian Reich, general manager, Performance Oscilloscopes, Tektronix. “This repeatable approach for 400G electrical PAM4 standards compliance testing is another addition to a rich set of PAM4 measurement tools from Tektronix for the growing datacentre community.”


The Tektronix 400G package allows users to evaluate electrical PAM4 signals to specification-mandated limits, and offers full OIF-CEI spec-level compliance tests. The solution includes digital clock recovery capabilities that provide trustworthy measurement results under all conditions, including signals impaired with ISI jitter or other impairments. Tektronix 400G-TXE compliance package performs standard required test sweeps with just one application, which results in shorter test times, more reliable and repeatable results and more ease of use.


Beyond compliance testing, Tektronix also provides PAM4 analysis & debug software solutions for both Real-Time and Equivalent-Time Oscilloscopes to support designers with insights needed to fully evaluate failing conditions such as BER and Eye Height & Width.





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