https://forums.servethehome.com/index.php?threads/brocade-icx-6610-serial-port-pinout.36014/

Is what I first was following but Rx and tx are reversed in that table.

Brocade icx 6610. Do the fan mod so it’s near silent and cool. There are sites dedicated to completely unlocking it’s abilities.

Get the 24 (or 48) port PoE 1GbE - 8x 10GbE SFP+ ports and 4x 40GbE QSFP ports (QSFP on the rear). 2 of the 40G ports can be broken down into 8x 10GbE SFP+ ports the other 2 are strictly 40GbE QSFP.

To split the 2 QSFP ports into 8 SFP+, you need to buy 2x QSFP <-> 4x SFP+ cable.

The thing is a beast and quiet after the mod.