Resolved! 5520 switch 1000BT GBIC in 5520-VIM-4X wont link
I put a 1000BASE-T SFP (FS.com Extreme encoded) that usually works without hesitation in X450G2 switches in a new 5520 switch. This would be port 1:57. I connected a cable to an ethernet handoff and get no link. sh port 1:57 does not show any link ...