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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 I wondered about that too. If it's Ethernet + PoE it's certainly an odd one and the 4-legged transformer would suggest 10 mbit half duplex! Weird, but I mean... it's just a keyboard