The pass through modules are gigabit only.
So this is my first 1955 chassis. I usually use M1000e's...  It seems when I plug the ethernet passthru modules (PN: BMX-PHY) into slots 1 and 2, they don't light up or provide link in either direction.  When I plug them into I/O slots 3 and 4, they blink a green status light, but still no link. Any ideas how to troubleshoot these modules? Is there some "disable" setting somewhere I should be checking? I can only assume these modules might be bad, but the green blinky light might suggest otherwise. The network cables are plugged into a Cisco 2900 (100Bt) switch.
1955 Chassis Ethernet modules seem dead when in I/O slots 1 & 2