Re: [Discuss-gnuradio] UHD Problem...usrp2 no control response

[Josh Blum]

The no control response might mean the pause frames are messing up the 
control packets. Does this happen in a receive only application?

One way to alleviate this would be to run the flow control branch and 
images. See the flow control branch on the UHD repo. and images are 
here: http://www.ettus.com/downloads/uhd_images/

The purpose of the multi source block is to handle channel alignment. If 
you dont require this, multiple single source blocks will work as well.

-Josh

On 11/12/2010 02:23 PM, Justin Bracken wrote:
> Hello All,
>
> I think I have configured my USRP2 correctly and according to "UHD-USRP2
> Application Notes". Im at the point where I can command line ping each
> usrp2. I see the link activity leds flash and recieve responses from the
> USRP2. It appears that it does this for each card and each corresponding
> USRP2 connected to that card. That is I have 2 usrp2s each one is connected
> to its own gigabit ethernet card.
>
> My problem now is that when I start GRC and try to use the usrp2s I have a
> problem with the USRP2 on eth1. the one on eth0 works fine. For the eth1 I
> get "usrp2 no control response"  What do I do next?
>
> In GRC, I see the single usrp2 block and the multi-usrp2 block. my
> understanding is the multi block is for soft-mimo. Do I have to use one or
> the other or can I use either or? That is a single usrp2 tx/rx block for
> each usrp2 tx or usrp2 rx node. So if I want one tx and two rx I would have
> 3 single usrp2 blocks, 2 recieve or source blocks, and 1 transmit or sink
> block.
>
> Or is it that because I have two USRP2 connected to one pc running GRC I
> MUST use the multi-usrp2 block.
>
> Please help, Im starting to learn this new version of GRC so I may be making
> a newbie mistake or be plain confused. I have searched on the error and it
> seems that people are discussing a python version of it but that was in
> september. So I don't know if thats relvant to me. I do eventually plan on
> having one USRP2 as a transciever. And it sounds relevant to that but is
> that an old and hopefully dead bug?
>
> Thanks,
> Justin
>
>
>
>
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