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Digital audio protocol for 100M copper
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LapTop006:

--- Quote from: ehughes on December 10, 2018, 10:29:19 pm ---Balanced line (transformer coupled) AES3 will work

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Yep, if you weren't going with Ethernet I'd go with that. Also works fine over coax. Except for a few bit flips that almost nothing cares about it's the same thing as S/PDIF, but worth knowing that the pro audio world often just call them "AES" inputs or "AES/EBU"
dmills:
If I were doing this I would want CAT5 cables (it is all kinds of cheap to get installed and terminated) and POE so the end devices do not need separate power. I would also be looking HARD for cots gear, there is little here that needs reinventing. Do not underestimate the wiring costs, I would expect the cabling to come in at the same order of cost as the end box.

Audinate for example have the Dante Ultimo chipset that IME just works and gives you access to a huge range of Dante audio boxes that do all kinds of interesting things, I would bet there is an Dante intercom controller you can just buy.

Dante feels heavyweight, but I think the flexibility it gets you is probably worth it. For example, hook a PC up to the network and run a $30 virtual sound card and the supervisor can now record the interactions with customers, useful for dealing with complaints...

You could go AES3 over two pairs and it would probably be fine, but then you are having to build a custom central control box which is a bit of a pain, and is a nasty single point of failure, with AES67 or Dante you just use an off the shelf POE switch as the central controller and that is available from any computer bits place.

There are two key things about this sort of project, reliability and usability, think hard about the environment the control positions are used in, heavy duty membrane keyboards and sealed boxes might turn out to be a very good thing for surviving the deep cleaning crew.

Regards, Dan.
NiHaoMike:
If there's going to be a dedicated line to each stall, keep it simple and have the stall unit be just a passive speaker and a microphone with bias powered preamp. The central unit will have all the signal processing circuits. Keep the signal voltages high and there will be little interference.
LapTop006:

--- Quote from: dmills on December 11, 2018, 01:18:21 pm ---Audinate for example have the Dante Ultimo chipset

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Random fact, that chipset is named for the suburb of Sydney their office is in, just a few blocks from my apartment, has a cafe downstairs that does a lovely Korean-style steak sandwich.
nctnico:

--- Quote from: mariush on December 11, 2018, 11:31:00 am ---I don't see how computers are expensive... there's boards with soldered cpu like this one for example at 60$: https://www.newegg.com/Product/Product.aspx?Item=N82E16813157730&ignorebbr=1
Add 40$ for 4gb ddr3 and a ssd and you'll only need a psu to power it.  but there's such boards with 12v or 18.5v dc in jacks
See Asus H110T for example: https://www.amazon.com/H110T-CSM-LGA1151-Mini-ITX-Motherboard/dp/B01EZGYSGG

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The problem is not in the hardware but in the software to run it. For that you'll suddenly need IT maintenance people in an organisation which likely doesn't have any.
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