[USRP-users] Error "fifo ctrl timed out looking for acks"

Marcus D. Leech mleech at ripnet.com
Fri Apr 10 00:52:12 EDT 2015

On 04/10/2015 12:47 AM, Jonathan Verlant-Chenet via USRP-users wrote:
> Hi,
> I'm using 3 USRP N210 R4 controlled by one computer through a gigabit
> Ethernet switch and Cat 6 Ethernet cables. The USRPs are commanded
> through a c++ script lauched by a Matlab code. The host runs on
> Windows with Matlab 2013a, VS2010 and UHD 003.008.000 (same version on
> the device)
> I'm getting the error "fifo ctrl timed out looking for acks" whatever
> the parameters I put, something like 9 times out of 10 tries. I read
> online that the "link" between the host and the devices might be down.
> So I tried rebooting every part the equipment, or simplifying it to 1
> Ethernet cable between 1 host and 1 USRP. The result is the same.
> When I try with another computer (same model, but only matlab and the
> UHD drivers are installed), the error does not appear.
> Can you help me identifying the source of this error?
> Thanks in advance,
> Jonathan
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> USRP-users at lists.ettus.com
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
It's likely that your gigabit switch is dropping traffic, or you have a 
Intel 82579LM-based network interface on your host machine which is
   dropping traffic.

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