[hpsdr] Call for Comments and Discussion - OzyII

[Eric Blossom]

On Tue, Jul 21, 2009 at 12:29:20PM +0100, Bob Cowdery wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi all,
>
> A few extracts and comments below. These make me think that the first  
> step should be to establish what the objectives are because the  
> possibilities are wide ranging.
>
> Bob
> G3UKB
>
>
> "I'd say UDP is the way to go. Not only is UDP almost trivial to  
> implement into an FPGA once you have raw Ethernet TX/RX working, its  
> functionality is easily sufficient for modern HDR systems. Datagram loss  
> is not an issue when streaming over a (dedicated) local net, and a host  
> that can't keep up with an UDP flow will certainly choke on the same  
> flow over TCP."
>
> This seems to be a pragmatic proven option but doesn't add huge value  
> over OZY1 except cable length and multicast. These two alone may be  
> sufficient justification.

With gigabit ethernet and jumbo frames it's possible to transfer
120MB/s to/from the host.  That about 4x what you can do with USB
_and_ it's full duplex.  (When you start sending 120MB/s to/from the
host you'll find you have a whole new set of problems ;-))

Eric

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