The AT4079B is a fully featured 400G BERT. It covers a wide range of bitrates between 1.12 and 28.12 GBaud, while supporting both NRZ and PAM-4 coding schemes.

The GUI allows you to individually control each TX level, equalization, eye balance, pattern and Gray coding. The user may also inject error sequences into the stream. The receiver features CTLE and FFE equalization that, in combination with TX FFE, compensate for up to 30 dB of loss at Nyquist; it also allows advanced troubleshooting capabilities by showing separate LSB and MSB BER, offering targeted errorinsertion and allowing real-time monitoring of the received signal levels histogram, SNR and receiver equalizer tap values.