Is it necessary to use a Network Isolation Choke with the FT 3120 and FT 3150 Free Topology Smart Transceivers?
The FT 3120 and FT 3150 Free Topology Smart Transceivers can communicate reliably in the presence of over 3Vrms common mode noise (EN61000-4-6 Level 2) with no changes to your existing PCB. This level of immunity will eliminate the need for a network isolation choke in most light industrial applications. By implementing the modifications to the standard FTT-10A ESD/Surge protection circuitry described above, the FT 3120 and FT 3150 Free Topology Smart Transceivers will be able to communicate reliably in the presence of 10Vrms of common mode noise (EN61000-4-6 Level 3) without the need for a network isolation choke.
