I have 2 3Com 5500G-EI 24-Port (3CR17254-91) switch which has 24 port 10/100/1000 BASE-T besides 4 SFP-based Gigabit ports.
The 4 SFP-based Gigabit ports labeled as 25/11, 26/12, 27/23 and 28/24, ONLY one port of the pair is up. For example, if port gigabitethernet 1/0/28 enabled gigabitethernet 1/0/24 goes Administratively down automatically.
Does that mean the total functioning number of ports is 24 and it couldn't be 24 Base-T + 4 SFP ?!!
Note: the below post shows the same problem with no solution, I've tried all suggested solutions but didn't work.