[hpsdr] OZYII

[Bob McGwier]

It would be really helpful if we could adopt protocols that are similar 
to those transferring IQ data over the USRP2 and other new ethernet IQ 
delivery radios (Flex CDRX3200 comes to mind ;-)  ).  They are 
delivering or soon will be delivering IQ streams using the VITA 49 
standard.  The Flex receiver already does, and the USRP2 will soon 
deliver streams as UDP/IP so the packets can easily be routed through 
switches.

One of the things we have found out with the USRP2 which led to a lot of 
this development was that ethernet throttling (flow control) stuff just 
does not get beyond most switches.  You therefore need to consume an 
Ethernet port as dedicated to the IQ stream.  For my commercial 
applications this was useless.  I wanted to take the 32 receive streams 
from the Flex CDRX3200 and route them to distributed computing and to be 
able to throttle them as needed.  For the USRP2, we could not reliably 
transmit without the flow control.

I suggest that HPSDR take a longer view as it moves to GigE delivery.

While the USRP2 is using Xilinx, its cores, etc. are open source verilog 
and adaptable.  I will be (or have) incorporating the CDRX3200 and other 
receivers (Softronics MSDD6000) comes to mind into GNURadio. The Vita 
49, UDP/IP, throttling, etc. will all be in the open source code (or 
soon will be).  STEAL IT ALL as it becomes available.  That is what it 
is there for.

Bob
N4HY



On 1/13/2010 8:25 PM, Phil Harman wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hello,
>>
>> What is happening with OZYII development?  From the Wiki it looks like it
>> has stalled back in October.
>>
>> Thanks,
>>
>> Jim Maxwell
>
> Hi Jim,
>
> I did reply to your direct email but it looks like you did not receiver it
> for some reason.
>
> The current status of OzyII is as follows:
>
> - I have successfully interface the Micrel PHY evaluation board to an Ozy
> board - see the photo on the Wiki.
>
> - I can send raw Ethernet frames between the board and the PC
>
> - I have modified KISS Konsole and replaced libUSB with SharpPcap so can
> now communicate with the OzyII board over Ethernet
>
> - I've replaced the USB interface code in the Ozy FPGA with an Ethernet
> equivalent and this works with KISS Konsole
>
> - I have a issue when operation full duplex using the evaluation board.
> This has very long tracks from the chip to the edge of the board and I
> think its just a crosstalk issue.
>
> - The person that was to layout the PCB has been over taken by other work
> projects.  Fortunately we have another volunteer who has just stated on
> the board.
>
> I have a draft Ethernet protocol document, basically a layer over the
> current USB one, that I'm happy to send you.
>
> Apologies for not updating the OzyII Wiki recently, I've been totally
> absorbed with completing Hermes.
>
> 73's Phil...VK6APH
>
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-- 
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