Solution:

The chip used in the media converter, ADM6993/X, incorporates a Snooping mode, which allows packets perform cut-through between TX<-->FX while both TX and FX ports operate on 100M Full mode. On snooping mode, the packets will not enter the switch core to perform store and forward mechanisms. •While SNP_EN=1, the ADM6993/X TX FX Media Converter will act TX<-->FX bridge while both TX and FX ports operate on 100M mode. •While SNP_EN=0, the ADM6993/X TX FX Media Converter will force all packets to enter the switch core to perform store and forward mechanisms. ( Default )