I have this sfp+: Wiitek 10GBase-T 10G RJ45 to SFP+ Copper Transceiver 30-Meter, Compatible for Cisco SFP-10G-T-X, Ubiquiti, Mikrotik (Cat 6a/7 or Better) https://a.co/d/grCYkak
It's installed in a brocade 6610 which doesn't support 2.5 or 5g on the SFP+ ports. Flow control is enabled.
On the cable modem side it's connected to the 2.5g port at 2.5g and on the Brocade side it's connected at 10g. Everything works as expected and I can pull 1.5g from my ISP (which is the limit of my subscription).
It's installed in a brocade 6610 which doesn't support 2.5 or 5g on the SFP+ ports. Flow control is enabled.
On the cable modem side it's connected to the 2.5g port at 2.5g and on the Brocade side it's connected at 10g. Everything works as expected and I can pull 1.5g from my ISP (which is the limit of my subscription).