Hi Farnaz, Regarding #1, the USRP can be either Tx, Rx, or both, but it does not affect maximum streaming rates. The 10Gbe link is bi-directional and can handle a maximum of 300 MS/s on a single link in both directions. You can use both links such that you can receive both channels of the X310 at 200 MS/s.
Regarding #2, yes. The USRP itself perhaps can handle the 200 MS/s per channel on transmit, but the PC just can't keep the streaming at that rate without hiccups. The best you can get is 100 MS/s per channel on Tx. Regarding 3, not sure. Rob On Tue, Jul 31, 2018 at 10:34 AM Farnaz Chamanzadeh <farnaz.c...@gmail.com> wrote: > Dear Rob, > > 1. Can you explain if the USRP may be configured only in receive/transmit > mode or is it also possible to configure in a single mode (a pure > transmitter or a pure receiver) using both optical interfaces for the task? > > 2. In the first remark in your email, you mentioned that the host-to-USRP > streaming does not work at 200 MS/s for the transmit case. Does it mean > that in the USRP-to-host mode it supports 200MS/s per channel in > receiving mode while the host to USRP supports only 100MS/s per channel? > > 3. About storing the samples on the USRP, does anyone know that if Ettus > has any plans to add this capability to the USRPs? > > > Best, > Farnaz > > On Mon, Jul 30, 2018 at 6:27 PM, Jason Matusiak < > ja...@gardettoengineering.com> wrote: > >> I've actually done this with success, unfortunately, I am not allowed to >> share it :(. It wasn't too hard, I used a core in the block to hold the >> data, and then I just repeated it when I sent it out over and over. >> >> The catch was that there was a little bit of an issue within rfnoc at the >> time (you can see mailing lists conversations from back then in the >> archives) that kept it from kicking off at startup (an enable switch worked >> fine though). Jonathon P helped with a patch to get me going, but that >> obviously has been mainlined by now since they have a siggen working (it >> didn't exist yet when I did my block). The issue had something to do with >> the block sending data before everything have been initialized and came up >> properly. >> >> So it isn't too bad to create one. Good luck! >> >> >> >> --------- Original Message --------- >> Subject: Re: [USRP-users] USRP X310 Remote Configuration >> From: "Rob Kossler via USRP-users" <usrp-users@lists.ettus.com> >> Date: 7/30/18 9:33 am >> To: "Farnaz Chamanzadeh" <farnaz.c...@gmail.com> >> Cc: "usrp-users" <usrp-users@lists.ettus.com> >> >> Perhaps look at the RFNoC siggen block. You will need to add some >> component such as a block memory or fifo to store the samples on the fpga >> and then you will need a way to populate the memory and then play it out >> when desired. >> >> Rob >> >> On Mon, Jul 30, 2018 at 3:49 AM Farnaz Chamanzadeh <farnaz.c...@gmail.com> >> wrote: >> >>> Dear Rob, >>> Thanks for your helpful response. The reason that we need to use a >>> switch is due to hour host hardware limits, which only have one 10GBE. >>> About the second remark in your email, do you have an example or a >>> reference where a similar case was implemented which we can use as a >>> guideline for our implementation? >>> >>> Best regards, >>> Farnaz >>> >>> On Thu, Jul 26, 2018 at 7:52 PM, Rob Kossler <rkoss...@nd.edu> wrote: >>> >>>> Hi Farnaz, >>>> A couple of remarks and questions >>>> - Remark 1: in order to get 200 MS/s transmit streaming, you will NEED >>>> to have the samples on the USRP. The host-to-USRP streaming does not work >>>> at 200 MS/s for the transmit case (unless something has recently changed). >>>> The host-to-USRP max for transmit is 100 MS/s per channel >>>> - Remark 2: that leads into your question about having the samples >>>> stored on the USRP rather than streamed from host. This is not presently a >>>> capability, but can be added with some modest FPGA work. I have been >>>> desiring such capability for a couple of years - I hope that Ettus adds >>>> such capability in the future. >>>> - Question 1: why do you plan to use a 10gbe switch with a single >>>> connection to the host PC? Why not have multiple 10Gbe links at the PC >>>> which connect to each USRP individually. A NIC such as Intel XL-710 >>>> provides 4 10gbe links. >>>> >>>> Rob >>>> >>>> >>>> On Thu, Jul 26, 2018 at 12:13 PM Farnaz Chamanzadeh via USRP-users < >>>> usrp-users@lists.ettus.com> wrote: >>>> >>>>> 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 >>>>>> >>>>>> _______________________________________________ >>>>> 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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