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I am using two identical Tp-link media converters Model No. MC100CM,and they are linked by 1Km fiber optic cable with one side there is Siemens PLC CPU 315-2PN/DP with 100Mbps profinet port connected with the media converter,on the other side there is Siemens interface module 153-4PN 100Mbps port connected to the other media converter.But i have a random communication interruption between the CPU and the interface module,with a direct link via profinet cable or Rj45 the modules communication is working the problem is via the media converters.I have asked Siemens and confirmed the modules are configured correctly and i should ask Tp-link, any Suggestions?