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Found this beautiful unused keyboard in storage at work. Switches are all Cherry Brown and I really like the feel of them. Only gotcha: the interface may be an oddball.
Hey wait a gosh dang minute what is going on in here
The two holes are buttons and it looks as if two of the traces from the RJ-45 go into a transformer! There's also an unused header.
@vxo the transformer is used to electrically isolate the RJ45 signal from the cable. if only 2 traces are used then likely it's a telephone interface instead of an Ethernet interface
@vxo if it's for a broadcasting system like you say then the telephone interface makes sense - you can carry 4 telephone lines over a cat5 cable and use a switchbox to bus them together. likely that there's an audio signal going over that line in that case.
@vxo absolutely could be. could also potentially be some power over ethernet abomination
@spinach out of curiosity I poked "USB common mode choke" into the quacky search engine and... yeah that sure looks like what I'm seeing, not an ethernet magnetic. Cool. I'm going to carry on assuming this device is native USB :)