David, You need a reasonable CTLE and a 14 tap DFE (or equivalent) with NRZ modulation. Walter From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of David Banas Sent: Sunday, March 01, 2015 10:57 AM To: SI-List; ibis-macro@xxxxxxxxxxxxx Subject: [ibis-macro] Anyone opened the eye, at 28 Gbps, for any of the 802.3bj working group's channels? Hi all, I'm attempting to, in simulation, open a 28 Gbps eye, using various candidate channels from the 802.3bj working group's "Channel Data" page, located here: http://www.ieee802.org/3/100GCU/public/channel.html And I am failing miserably. I'm wondering if anyone else has tried this and had any luck. Specifically, I'm curious as to: 1. Whether you were able to open a 28 Gbps eye, using any of these channels? 2. If so, what modulation scheme were you using? 3. Approximately, how much Tx and Rx equalization was necessary, in order to do so? 4. Is there a particular one of these channels, which the group is tending to gravitate towards, in order to "standardize" modulation scheme comparison results. Thanks, in advance, for anything you're able/willing to say publicly on this topic! -db