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RE: [Discuss-gnuradio] The ultimate SDR (Ethernet v. gigabit)

From: Ettus, Matt
Subject: RE: [Discuss-gnuradio] The ultimate SDR (Ethernet v. gigabit)
Date: Tue, 23 Oct 2001 11:31:47 -0700

> Re Ethernet interfaces:  I suggest that the first version be built
> with 100mbit FDX Ethernet, and that the follow-on design upgrade
> to gigabit FDX Ethernet.  This will be a pretty straightforward
> drop-in replacement at 10x the data rate, with the same software
> interface, same packet formats, etc.

I don't think computers of the next couple of years would be able to consume
and process more than about 100 mbits/sec of data, so 100mbit is fine, I
think.  Besides, I'd like the ethernet part to be the easy part of the

> You could do the design for gigabit today.  PCI cards for it are down
> to hundreds of dollars.  They can't do the full thruput because it's
> faster than the PCI bus can handle, but they're much faster than
> 100mbit.  I suspect that the catch is that you'll be able to find lots
> of cheap and available IP cores and/or chips for 100mbit, but few for
> gigabit today.

Well, I can't find any free 100mbit cores except from opencores, and I'm not
sure of the state of that one.  Cheap isn't good enough for free hardware...

> PS: I also think you should only put in the work to design hardware
> for SDR's if you think it's fun.  Trying to sell niche computer
> hardware is a great way to do lots of work and lose money.  Trying to
> design mass market computer hardware is a great way to do lots of work
> and lose even more money, unless you know how to market and sell mass
> market computer hardware.

I wasn't thinking of marketing it.  I'd just like to design it, and if more
people like it, some organization could kit and sell it.


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