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64 GBaud BERT simplifies test setup, accelerates 400G receiver tests

64 GBaud BERT simplifies test setup, accelerates 400G receiver tests

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By eeNews Europe



This highly-integrated bit error ratio tester (BERT) for PAM-4 and NRZ features new adjustable equalizer; it can speed receiver test setups with its internal pattern generator, giving repeatable results with built-in equalizer to reopen closed eyes.

 

Today’s data centre infrastructure is continuously optimized to address bandwidth capacity growth, power, reach and service differentiation. Higher transmission rates, more transmission lanes, and new multi-level data formats, such as PAM-4, address the increased transmission bandwidth demand.

 

The latest revisions of IEEE 802.3bs and OIF CEI-56G implementation agreements define PAM-4 and NRZ interfaces for electrical chip-to-chip, chip-to-module, backplane connections and optical interfaces for up to 400 Gb/sec bandwidth. R&D and validation labs that need to characterize receivers for data centre interconnects with PAM-4 or NRZ data rates up to 64 GBaud are facing new test challenges, such as tighter timing margins, channel loss, non-linearity, level interference and crosstalk effects—making test efficiency and accuracy essential.

 

Overcoming channel loss in electrical interfaces, such as chip-to-chip, chip-to-module interfaces and backplanes, is a big challenge with higher symbol rates. Pre-distortion techniques, such as de-emphasis, are used in the transmitter and equalization in the receiver to help re-open closed eyes caused by inter-symbol interference.

 

The updated M8040A is the latest member of the modular AXIe based M8000 series of BER test solutions and is a highly integrated BERT that supports PAM-4 signals up to 64 Gbaud and NRZ signals up to 64 Gbit/sec. The pattern generator module provides built-in de-emphasis, jitter injection and an optional second channel. Engineers and designers can select PAM-4 and NRZ by software in the user interface, eliminating the need for external combiners, cabling and deskew to provide PAM-4 signals. For best signal quality, remote heads reduce the distance to the device under test. The analyzer module provides true PAM-4 error analysis in real-time for long PRBS and QPRBS patterns—allowing proofing even low-bit error ratios and symbol error ratios with the required confidence. The error analyzer now supports symbol rates up to 64 Gbaud for NRZ signals and built-in adjustable equalization. Users can control the M8040A from a graphical and remote-control interface.

 

Keysight; www.keysight.com/find/m8040a

 

 

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