No link between TL-SX3016F v1.0 and TL-SG3452XP v2.0 over SFP+
I have a strange problem with link between mentioned switches
The two switches are linked together with fibre (LC OM4 850/850Nm over 50/125 um) over the TL-SM5110-SR module over a patchpanel in the building. from the patchpanel to the switches there are 1m and 5m cables.
The cable is 49.16 meters (tested from the fibre team with test device, with dampings between 0.11-0.14 which is very good) in length between the two patchpanels.
But i get no link between the two switches - if i connect the switches directly over the 5m or 1m cable - i got instantly link.
I did call the cabling company, which did install the 49.16m cable because i dont have any clue, why i didnt get link, so i did assume, it should be the cable itself or the patchpanel.
The guy did arrive this morning and did test the following scenarios
1. Link between the panels only -> ok with 0.11-0.14 damping
2. LInk between the panels with additionaly connected the 1m and 5m cable -> ok with 0.11-0.14 damping (so the distance is then 55.16m in sum)
So its not the the panel or the cables.
He did assume, maybe the switch did not test the power of Rx/Tx for sending over larger distances and bring more power to the fibre port. Did search little bit and saw, there is a DDD option, but im not sure if this is what i want/need? Also over the SDN i'm not able to set the DDD feature and i cant directly edit the switches, because they are locked (SDN).
So my questions
How to enable DDD in SDN? Or how to boost more power to fibre ports on the switches?