[USRP-users] Help: USRP N200 not detected

Mythili Vutukuru mythili at cse.iitb.ac.in
Wed Sep 4 01:04:07 EDT 2013

Thanks Robert. Booting into safe mode and reflashing fixed the problem.

Just curious, is this a feature or a bug? The earlier USRPs I have used 
came with working images, and reflashing was needed only when we tried 
to change something. Has this assumption changed?

Thanks again for your help.


On Tuesday 03 September 2013 10:26 PM, Robert Watson wrote:
> Hi Mythili,
> I had a similar sounding problem with a recently acquired N200.
> It was similarly unresponsive to pings etc, so I booted it into safe 
> mode (look here under 'device recovery' for details: 
> http://files.ettus.com/uhd_docs/manual/html/usrp2.html). Once booted 
> into safe mode it responded to pings and I reflashed the firmware and 
> fpga images. After a normal reboot with the newly uploaded images it 
> was fine. Hope this helps.
> Regards,
> R.
> On 3 September 2013 13:12, Mythili Vutukuru <mythili at cse.iitb.ac.in 
> <mailto:mythili at cse.iitb.ac.in>> wrote:
>     Hello all,
>     Our lab has recently acquired some N200 USRPs with SBX
>     daughterboards. I have an Ubuntu desktop with a gigabit ethernet
>     interface. I have connected the N200 + SBX to it via ethernet. I
>     have installed GNURadio + UHD using Marcus Leech's build-gnuradio
>     script. I have configured a static IP of on my
>     machine. When I power my USRP on, all LEDs except LED B flash
>     (expected since LED B is MIMO cable which I am not using), and LED
>     F alone stays on. The ethernet light glows inside the USRP, so I
>     know there are no loose connections on the netwprk side. Now, the
>     problem is that my system does not detect the USRP at all.
>     ----------
>     mythli at mythli:~$ uhd_find_devices
>     linux; GNU C++ version 4.7.2; Boost_104900;
>     UHD_003.005.003-119-ga812d8a3
>     No UHD Devices Found
>     -----------
>     When I open the net burner GUI also, my device does not show up.
>     When I try to ping, I get no reply. In tcpdump, I see
>     that ARP requests from my machine for are going
>     unanswered. Here is my machine:
>     ----------
>     mythli at mythli:~$ uname -a
>     Linux mythli 3.5.0-17-generic #28-Ubuntu SMP Tue Oct 9 19:32:08
>     UTC 2012 i686 i686 i686 GNU/Linux
>     ----------
>     While I have used USRP1 + RFX2400 before, this is my first time
>     using N200. I have googled extensively on this issue, but I am
>     stuck. I am wondering if I am missing something fundamental in the
>     setup. Any help / tips / pointers are very much appreciated.
>     Thanks,
>     Mythili
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