Hi All, The current back-channel communication proposals have been limited to Tx-Rx getwave calls. What about Tx-RX init calls for pure-statistical flow. High level steps would be 1. Tx-init should send IR convoluted with initial FFE taps to Rx-init. 2. Rx-init should modify IR based on Rx-filters like CTLE -curves (expressed as IR), RDL-parasitics (expressed as IRs) etc. 3. Rx would then estimate what FFE taps would make this modified-IR even better and send recommendations back 4. Tx would modify....and so on... I understand that the back-channel for pure-statistical flow would have limited use but then if we are in a mode of allowing statistical flow to completely characterize (though less accurate and ltd.) the Serdes, we need to extend the back-channel to init functions as well. I would like to hear people's opinions so that we can take next steps on bringing more details to this proposal. Rgds ..kukal