Could you share the device arguments you used?
Sent from my iPhone
> On Aug 1, 2019, at 6:28 AM, Paolo Palana via USRP-users
> <usrp-users@lists.ettus.com> wrote:
>
> Good morning to all the mailing list users.
>
> It is about a couple of months that I'm fighting with my N310 for different
> reasons.
>
> Now I want to report a couple of strange behaviors I'm observing with this
> device. Of course their can be my faults... I hope some one in the community
> can make light.
>
> I try be as clear as possible.
>
> My goal: Streaming the 4 RX channels over the two SFP+. Let me say I want A:0
> and A:1 on sfp0, while B:0 and B:1 on sfp1.
>
> Premise: * I'm using 10G link with fibers. I'm sure the network adapter and
> fibers work well because they are the same I used with my X310 (and it works).
>
> * I'm using N310 in legacy compat mode
>
> * The software I use is the same I used for my X310 and it
> works (at least with X310 of course!)
>
> * MTU is to 9000 on both the host and N310
>
> * I'm using UHD 3.14.0
>
> Strange behavior 1: when I start my acquisition program I can see (using
> tcpdump on the host side) small packets (16 or 24 bytes in size, I think they
> are some kind of commands) flowing through, let just say sfp0 iface. If I
> reboot the N310 and the I start again my program I can see the same kind of
> packets flowing through sfp1 (but not through sfp0). If I reboot the N310
> again may be these packets start flowing through sfp0 or sfp1.... it
> depends!!!! Is that the normal behavior of N310?
>
>
>
> Strange behavior 2: in order to start streaming the 4 channels I use this
> code:
>
>
>
> time_spec_t start_sampling = mUsrp->get_time_now() + 1.0;
>
> uhd::stream_args_t str_args("sc16", "sc16");
> str_args.channels.push_back(mChannels[0]);
> str_args.channels.push_back(mChannels[2]);
> mStreamArgs.push_back(str_args);
> uhd::stream_cmd_t
> tmp_strcmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
> tmp_strcmd.num_samps = 0;
> // Timed
> tmp_strcmd.stream_now = false;
> tmp_strcmd.time_spec = start_sampling;
> uhd::rx_streamer::sptr tmp_rx_stream = mUsrp->get_rx_stream(str_args);
> tmp_rx_stream->issue_stream_cmd(tmp_strcmd);
> mStreamCmds.push_back(tmp_strcmd);
> mRxStreams.push_back(tmp_rx_stream);
>
> uhd::stream_args_t str_args2("sc16", "sc16");
> str_args2.channels.push_back(mChannels[1]);
> str_args2.channels.push_back(mChannels[3]);
>
>
> mStreamArgs.push_back(str_args2);
> uhd::stream_cmd_t
> tmp_strcmd2(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
> tmp_strcmd2.num_samps = 0;
> // Timed
> tmp_strcmd2.stream_now = false;
> tmp_strcmd2.time_spec = start_sampling;
> uhd::rx_streamer::sptr tmp_rx_stream2 = mUsrp->get_rx_stream(str_args2);
> tmp_rx_stream2->issue_stream_cmd(tmp_strcmd2);
> mStreamCmds.push_back(tmp_strcmd2);
> mRxStreams.push_back(tmp_rx_stream2);
>
>
>
> It works perfectly with my X310, but with the N310 it starts the streaming of
> only a couple of channels (A:0 and A:1 to be precise) and on sfp0 or sfp1...
> it depends!!
>
> Of course I miss something (or at least I hope so!). I checked and double
> checked examples coming from libuhd repository but there is nothing specific
> about the N310.
>
> Any help is appreciated. Thank you in advance.
>
> Of course if more details are necessary, please let me know.
>
> Have a good day
>
> Paolo
>
>
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>
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