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

I installed UHD in windows but didn't find FastDatagramThreshold.reg in <install-path>/share/uhd/FastSendDatagramThreshold.reg as suggested in the Windows specific notes. I pulled the UHD source off github and ran the file in question, setting the threshold to 2048. Unfortunately, this did not have any apparent effect on the sequence errors in GRC.

The two ethernet ports are given unique IP addresses, and the USRPs are matched to these addresses. The IPv4 connection properties for the ethernet ports are as follows:

IP Address: 192.168.10 (20).1 ( USRP uses 192.168.10 (20).2 )
Subnet Mask: 255.255.255.0

(No DNS Server Addresses specified)

Thank you for your continued assistance,
George

On 7/9/2015 9:29 AM, mleech@ripnet.com wrote:

See the windows-specific notes here:

http://files.ettus.com/manual/page_transport.html#transport_udp_params

Does setting the FastDatagramTheshold help?

Do you two ethernet ports have distinct addresses, and do your two USRPs have distinct addresses to match?

 

 

 

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

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@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    

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--   George Hadley  ECE Lab Coordinator  Purdue University

--   George Hadley  ECE Lab Coordinator  Purdue University