Electronics > Projects, Designs, and Technical Stuff
Digital audio protocol for 100M copper
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amlu:
you can get a working solution off the shelf, budget one would  be something like that:
https://www.bhphotovideo.com/c/product/969887-REG/behringer_x_32_rack_x32_16_midas_preamps_ipad_control.html
plus a digital audio snake to go with it...
its the lowest end but anyway used in pro audio/events and apparently does the job.
dnwheeler:
Many of the solutions being proposed assume that there is some need to aggregate multiple signals on a single wire. As I understand the OP, there will be separate point-to-point connections for each stall. There won't be collisions and there's no need for addressing or high bandwidth.

As others have mentioned, running two separate AES3 lines (one for each direction) to each stall should be fairly easy and cheap. Then on the "station" end, a simple selector to pick which lines to connect to (with enough software to synchronize to the start of a frame - there might be an AES3 decoder chip that do this). AES3 also has a low-speed user data channel for additional data if desired.
soldar:

--- Quote from: mc73 on December 10, 2018, 06:14:15 pm --- I've been tasked with updating an audio communication system used in the fast food industry for drive ins (e.g. 3 order takers to 30-60 order stalls). We're converting an old simplex analog audio system to duplex. There are long runs of conduit with multiple wires. We're moving to digital to avoid crosstalk and interference that was previously avoided by the simplex communication.
--- End quote ---
Hmmmm... It seems to me this should be quite simple and digital encoding is probably not needed. Plain Old Telephone wires run much longer bundled together. I would not discard analog because I think it would work and is simpler and cheaper.

OTOH, if the microphone can receive the speaker then you will have feedback problems. If the speaker is a headphone which cannot be picked up by the microphone then this is not a problem.

Having to deal with feedback and echo cancellation complicates matters considerably.
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