Hello im a beginner, so im happy if i only get keywords to google, but full
answers would
be great.

In my project we are going to push large amounts of data over a special
purpose network. >10Mbit/s is wanted, and i wonder what kind of systems that
can do this.
I was thinking about a simple ethernet adaptor for communication over the
cables, and 100Mbit/s should be a roof we never get near to (16MBit/s is our
goal speed).
If there are other/simpler ways to pass data over 50 feet cables, im also
interested in this. No addressing or stuff like that is needed, and each
cable goes from one adapter to another (no collision)

Now, the system should consist of 4 parts.
Two ethernet adapters.
An AD converter or a DA converter
A centar microprosessor/microcontroller.

Data recieved from one ENET adapter should be sendt to the other ENET
adapter.
If AD converter, aditional data from the ADC should be labeled and added to
the streams going out to each ENET adapter.
If DA converter, the system should be able to extract one kind of labeled
data from each stream, and then send it to the DA converter.

As i see it I have two options.
Either, have a Microcontroller, where all data pass trough, or some 
specialized buffersystem witch a microcontroller controles.
The data should not be processed in any way, only labeled and extracted.
The AD/DA datarate are 44.1 k/s at 16 bits (or 2x8 bits), and i want to be
able to push 8 (or possible 16) of these over the network.

My final question is, is there cheep microcontroller that can handle this
datarate?
I dont need alot of other stuff then send/recv/copy and some simple
labeling(adding a small header) or reading the header part. The header could
be as simple as a
identification byte, and a sequence byte for safity.

Im realy at an beginner level, but i hope to get some guidance on where to
continue / search.
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