Anritsu announces all-in-one 400GbE PAM4 BER measurements

November 21, 2018 // By Jean-Pierre Joosting
Anritsu Corporation has released its 64-Gbaud PAM4 Pulse Pattern Generator (PPG) and 32-Gbaud PAM4 Error Detector (ED). This PAM4 BERT supports 400GbE testing when these modules are installed in the Anritsu Signal Quality Analyzer-R MP1900A series to implement a bit-error-rate test solution with best-in-class signal level quality and excellent Rx sensitivity for next-generation broadband communication systems.

Due to the expansion of next-generation 5G mobile communications and Cloud services, data traffic volumes are expected to increase. To manage this demand, infrastructure operators, such as data centers, are investigating the improvements to speed in PAM4 and multilane communications systems. Now 400GbE speeds are being deployed using either the 26.5625-Gbaud PAM4 x 8 lanes or 53.125-Gbaud PAM4 x 4 lanes methods.

To meet this technical demand, Anritsu has developed the released 64-Gbaud PAM4 PPG with ‘best-in-class’ signal level quality and the 32-Gbaud PAM4 ED with excellent Rx sensitivity performance to support evaluation of equipment and devices for high-speed, large-capacity transmissions.

When using the PAM4 method to encode data as four amplitude levels, the gap between signal levels is one-third compared to the NRZ method, which reduces the unit time per symbol at higher baud rates, emphasizing the importance of signal quality in achieving high-speed transmissions.

However, the degraded signal quality caused by crosstalk and noise resulting from use of multiple lanes and high-density circuit design increases the need for evaluation of minimum Rx sensitivity using stress-test signals.

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