I have problem with SFP-T modules in EX2300 uplink ports.
They are properly detected in chassis hardware with a name and s/n but the logical link is down so I can't pass any traffic throught it.
Weird thing is that the link on other side in EX2200 physical port comes up when I connect the cable and it blinks as it were passing some traffic but on EX2300 uplink side the LEDs for power and traffic are off.
I have a batch of SFP-T modules (non-Juniper but programmed for it) which works till you reboot the switch after which you need to re-attach them physically to make them function properly.
I have original SFP-T modules and few other from different vendors and even those programmed for Cisco. All of them are working fine with older hardware EX2200/EX3300 but not on ELS hardware EX2300/EX3400.
Maybe someone stumbled on this problem and solved it as I don't really have any idea why this happens and how to solve this.