Full Duplex

DUH! -- on the surface your question covers at least one semester in Computer Science if not more -- lets condense it a bit:

I need your definition of a comm system and also your definition of an industrial setting.

Are you interconnecting computers, printers, cameras, serial telemetry for industial control equipment etc. using an existing ethernet cabling installation?

Ignore your reference to "full duplex" or explain it in more detail as it applies more to the type of device connected to the ethernet structure than the structure itself.

you want to chat over ethernet or do you want an intercom? or to send data?

Ethernet is a data-link protocol for communicating data. Of course, data can be anything - files, voice, video, etc.. Other protocols run on top of Ethernet, for example TCP/IP. And yet other protocols run over that, all the way up to the Application layer.

If you want to set up communications, read about Ethernet on Wikipedia or some other place, then when you have a "general" understanding just buy some 10/100 Mbit network Ethernet cards (including driver software) and perhaps a cheap Ethernet switch. Of course, you're going to need cables (category 5 at least), unless you want to run WiFi, but I don't know how well radio signals will travel in your place.

The point here is your PCs (I'm assuming) are built to take network cards (If they don't have them built-in already.) And your PC should come with all of the applications you need to communicate over your network. If you're running LINUX or UNIX, well then you're on your own. Woof!!!

In adition to your very good informatio, please note that ETHERNET is a medium wher information may "colide", as they all go by the same way.

Yep. CSMACD. However, among a few nodes at 100 Mbps or even 10Mbps, the point is kind of moot. You're certainly not going to notice any delay.

its not a word can explain. however yuou can use intranet to construct your enterprise net. serveral net card can be done.