[USRP-users] [Discuss-gnuradio] [UHD] Cause of sequence errors (SSSSS...) when using USRP N210 as transmitter?

mleech at ripnet.com mleech at ripnet.com
Thu Jul 9 10:19:40 EDT 2015


What version of UHD are you using? 

Any idea what ethernet controller is used on that dual-port card? 

You'd have to go into windows configuration to determine this, since I
think that 'lspci' on the VM side will see some kind of emulated network

I've taken the liberty of copying this to the usrp-users list, since
this is more USRP-centric, than GnuRadio-centric. 

On 2015-07-09 09:21, George Hadley wrote: 

> I am indeed running inside a VM presently. Details below:
> Hardware:
> USRP N210 (2x) connected to dual-port gigabit ethernet card: http://www.newegg.com/Product/Product.aspx?Item=N82E16833166096 [2]
> Software:
> Windows 7 host OS
> VirtualBox VM running Mint Linux 17.1 (Mate Desktop edition)
> Network settings:
> + Adapter enabled and attached to NAT
> + No port forwarding settings defined
> It may be noteworthy that the receive operation of the USRPs works as expected. Only transmit doesn't appear to be working properly.
> Thanks,
> George
> On 7/9/2015 9:11 AM, mleech at ripnet.com wrote: 
> This is usually due to your network subsystem re-ordering packets, which is never supposed to happen but certain
> 1GiGe interfaces, particularly USB ones, do this quite a bit. 
> Are you running inside a VM? 
> What kind of network interface do you have? 
> On 2015-07-09 09:09, George Hadley wrote: 
> Hello,
> I'm working on developing some gnuradio exercises, some of which involve using USRP N210 devices as transmitters. When I attempt to run the related flowgraphs, I get a stream of sequence errors (S) in the GRC log window. Attached are a pair of GRC flowgraphs in which I am getting this error. I have tried installing the latest images to the USRPs and updating to the latest version of gnuradio available on the github master branch. Can somebody please point me to what I'm doing wrong? I've searched around on the topic for quite awhile, to no avail.
> Thanks,
> George
> _______________________________________________
> Discuss-gnuradio mailing list
> Discuss-gnuradio at gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio [1]

George Hadley
ECE Lab Coordinator
Purdue University

[1] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[2] http://www.newegg.com/Product/Product.aspx?Item=N82E16833166096
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