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Problem

car connected to station but not communicating with station
no electrical feedback (seen in logs or in backend)
socket not working

Solution

replace old IEC modul with new one. New one comes with new UTP cable which must be replaced also! Part number H-1013 IEC module with housing

Attached document to new part is available here.

DO NOT USE other cable, because it will damage the IEC modul or other components in the station.