The new P4-BER 5620-8 BERT has eight channels for QSFP-DD 400G transceiver test with data rate from 24 to 30 Gbaud in PAM-4 and in NRZ mode. The excellent PAM-4 signals and the full range of test pattern enable transceiver compliance tests like the TDECQ Transmitter test or the SSPRQ pattern test. The Error Rate is measured in real time in all 3 PAM-eyes simultaneously. The two boxes operate in the same clock domain. These features make the P4-BER 5620-8 ideal for a reliable test solution in production and R&D.