הפרעות RFI/EMI משפיעות לרעה על סאונד, בטח ובטח ב - WIFI
Noise is any signal present in an Ethernet network that is mixed in with the Ethernet data signal, that shouldn’t be there. Sources of noise are numerous and omni-present, and of all different frequencies. All active devices connected to a network such as routers, fibre converters and switches emit noise; other sources such as radio signals of all frequencies from TV, Radio, Satellite, Mobile Phones and WiFi are induced into Ethernet cables as noise.
ועוד משהו חשוב שכדאי להפנים:
Galvanic Isolation is designed to stop low frequency ‘mains’ frequency interference and DC voltages, but has no benefit for removing RFI noise.
Galvanic Isolation within ethernet networks is always physically implemented in Network switches where each connection goes through high frequency transformers for each of the 8 pins in the RJ45 connector. A high frequency transformer is used in order to pass through the data signal (which is a high frequency) while blocking DC and low frequency noise. They don’t block RFI frequencies higher than the Ethernet signal as they are ‘high pass’ transformers. Therefore, any RFI mixed in with the Ethernet signal will pass through the filter.
It’s very important to note that Galvanic Isolation transformers are only found in Network Switches, not on the input RJ45 sockets in streamers, therefore the streamer’s RJ45 input is highly exposed to RFI noise.
