Dears, To be more specific, we want to control multiple USRPs with one (remote) computer. We would like to stream known and periodic signal from each USRP. The sequence on each USRP is unique and is different from other USRPs.
Since the samples from each USRP are known, it would be more convenient if we can generate the samples once and preferably store them locally on each USRP. In this configuration, we want to use the host computer to send control commands to the USRPs specifying when each of them must transmit its specific samples. The USRPs are assumed to be synchronized, so the control commands from the host will generate a TDMA scheme. Each USRP will start signal transmission upon receiving the control command from the host computer. I would like to know that: 1. Is it possible to store the samples on the USRPs? or should we stream the samples from the host computer to the USRPs for each transmission? 2. Can we use the full bandwidth and 200MS/s in this setup? 3. After knowing the answer to the previous question, I would like to know how we can implement it? do you happen to have a demo or an example that can guide us in this implementation? Best, Farnaz On Wed, Jun 27, 2018 at 4:50 AM, Michael West <michael.w...@ettus.com> wrote: > Hi Farnaz, > > To clarify and expand on Marcus' comments, the answer is maybe. You can > do burst captures and transmissions at full rate and you can even use timed > commands to synchronize them, but there are limitations. If you can > describe in more detail what you want to do, we can more clearly tell you > if it is possible. How many channels do you plan to do simultaneously? > How many 10 GbE connections between the host and switch? How many 10 GbE > connections between each USRP and the switch? > > There is buffering of the TX samples on the X310 and it is configurable. > The current default is 32 MB. The DRAM is a total of 1 GB, and it can be > divided up however necessary. > > Regards, > Michael > > On Mon, Jun 25, 2018 at 12:23 PM, Marcus Müller via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> Dear Fernaz, >> >> you can't cheat 10Gig bandwidth! If you time-share any medium, then >> it's bandwidth must be shared. Since ethernet is de facto a timesharing >> thing, anyway, no, this won't work: >> Since you need to push through all the data through a single 10GigE >> connection, your 10 gigabits per second need to be divided along *all >> simultaneously operating* USRPs. So, if you have, say 10 USRPs, and all >> should be working at the same time, you've only got 1 gigabit per >> second per USRP, which limits you to about 25 MSample/s per USRP. It's >> really the same principle as a single internet access being shared by >> all people attached to the same router. >> >> Now, if these USRPs *don't* have to transmit all at the same time, then >> more is possible. >> >> > Also, does anyone know if it is possible to store the samples on the >> transmit USRPs? >> >> I'll go with a: no, at least probably not like you hope it is. Can you >> elaborate on your use case? Maybe we can help you if we better >> understand what you're trying to implement, from a bit of distance? >> >> Best regards, >> Marcus >> >> On Mon, 2018-06-25 at 20:32 +0200, Farnaz Chamanzadeh via USRP-users >> wrote: >> > Dear all, >> > >> > I want to connect multiple USRP X310 to one host PC and control them >> > all from that Pc, using one 10Gigabit Ethernet switch. My question >> > is that if it is possible to stream from each USRP in a different >> > time slot using the full bandwidth and 200MS/s in a setup similar to >> > the picture below? >> > >> > Also, does anyone know if it is possible to store the samples on the >> > transmit USRPs? >> > >> > >> > >> > >> > Best, >> > Farnaz >> > >> > _______________________________________________ >> > USRP-users mailing list >> > USRP-users@lists.ettus.com >> > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> > >
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