The AT line of products is highly integrated for the Advantest V93000 system and fits right underneath the load board, in the cavity of the test head extender. Due to this, the signal path to the DUT is kept extremely short.
The AT4039E is a fully featured 400G BERT that can be configured as a 4-channel PAM4 56 GBaud or 4-channel NRZ 56 Gbps lanes. Also, half rates of 28GBd are supported in PAM and NRZ modes. The transmitters support all standard test patterns mandated by IEEE and OIF such as PRBS13Q, SSPRQ, PRBS31Q, etc…