BERT enhancements simplify test setup

Posted By : Mick Elliott

Keysight Technologies has made enhancements to its M8040A high performance bit error rate tester (BERT) solution for testing PAM-4 and NRZ devices that operate up to 64GBaud. Engineers in validation labs and R&D who characterise receivers on the physical layer for emerging 400G data centre interconnects will benefit from simplified test setups and repeatable and accurate results.

Today’s data centre infrastructure is continuously optimised 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 for the next-generation data centre interconnects.

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/s bandwidth. R&D and validation labs that need to characterize receivers for data centre interconnects with PAM-4 or NRZ data rates up to 64GBaud 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 equalisation in the receiver to help re-open closed eyes caused by inter-symbol interference.

Downloads


You must be logged in to comment

Write a comment

No comments




View & download Keysight product literature, application notes, specifications & brochures.

Literature

View & download Keysight technical support documentation, demos, manuals & selection/configuration guides.

Support

Mobile World Congress 2018
26th February 2018
Spain Barcelona
embedded world 2018
27th February 2018
Germany Nuremberg
Industry 4.0 Summit 2018
28th February 2018
United Kingdom Manchester
Factories of the Future Expo 2018
28th February 2018
United Kingdom Manchester
Power supply design seminar 2018
1st March 2018
United Kingdom