Mimosa C5x on Cisco 3750

I try to connect Mimosa C5x antenna on a Cisco C3750 Software (C3750-IPBASEK9-M), Version 12.2(55) but i cannot get the link up on the interface .
I try an external POE, hte antenna start, but the link to the switch is down.

I try to set the speed and duplex without negotiation, but nothing changed!

Are you able to get the link to come up on another device?

How long of a cable do you have?

Is the radio booting up even?

yes, all is working fine if I connect it to a different type of switch:
I try with Dell N1500 and all is ok.
I try with a couple of Cisco 3750, on different port, and nothing!

Weird, sounds like something is happening with the Cisco, I have plugged C5x radios into lots of different things and never had an issue with negotiation…