I must be confused. Marine
ethernet? Ethernet doesn't care where it is, "marine ethernet" is blowing smoke.
A new standard? Um, no, ethernet is an existing standard. Putting it on a boat doesn'tchange that. More smoke, bring in the mirrors.
I think the bottom line here is that NMEA has realized NMEA2000 is a flop, and what they are ashamed to say is that they're introducing an ETHERNET ADAPTER to convert NMEA2000 into a standard ethernet format. That probably is what used to be called a "brdige", a box which takes two disparate media and connects them. Along with a protocol converter, to convert NMEA2000 into standard ethernet frames (data).
Although for small craft, just putting Wifi
into the boxes like Raymawhosis is doing now ought to do the job well enough.
grade ethernet? Hell no, the telephone companies were using gold-plated connecting pins for RJ45 cables
decades ago. Maybe I missed something, but all I see here is smoke and mirrors and NMEA trying to use jargon to keep out the civilians.