[USRP-users] Sync two USRP devices to sense 100MHz of spectrum
albazrqa at msu.edu
Thu Nov 9 09:46:38 EST 2017
Thank you Derek for the comments.
I just want to clarify this point about connecting two USRP devices; first,
it seems to be fine to connect a USRPN200 with USRP2 (via a MIMO cable),
Second, by connecting two devices via MIMO cable, I need to connect their
GigaBit Ethenet cables to a GigaBit switch, which feeds the host, right? Is
there an example (i.e. code) on how to do such configuration? What
parameters to send to each device?
I also don't have an external source, like 10MHz and 1 PPS references; my
plan is just to use MIMO cable; it seems from your reply it is doable.
Another question, I have two USRPB210 devices, is it possible to use these
devices instead of USRPN/2? Is there an extra hardware/software that we
need to use with USRPB210 to get the two devices sync in time and freq?
On Thu, Nov 9, 2017 at 9:34 AM, Derek Kozel <derek.kozel at ettus.com> wrote:
> Hello Wahhab Albazrqaoe,
> It is certainly possible to configure each USRP to be tuned to a different
> frequency and to be synchronized closely in time. A 1 Gigabit Ethernet
> connection can carry approximately 25 MS/s of 16 bit samples and 50 MS/s of
> 8 bit samples. We do not support sending 4 bit samples so it is not
> possible to carry 100 MHz worth of spectrum over the 1 GigE cable of an
> N2x0 or USRP2. You should operate in Dual Ethernet mode using the MIMO
> cable to share clock and time references. If you already have external 10
> MHz and 1 PPS references that you can send to both then the MIMO cable
> gives you little benefit in this situation.
> You will be limited to 8 bit samples so you should check that you
> application will be ok with that limitation. Newer USRPs use faster
> connections such as USB 3 and 10 Gigabit Ethernet to pass higher resolution
> samples at higher rates.
> On Thu, Nov 9, 2017 at 2:07 PM, Wahhab Albazrqaoe via USRP-users <
> usrp-users at lists.ettus.com> wrote:
>> Dear All,
>> We would like to sense (i.e. sample) 100 MHz of 2.4GHz spectrum. My idea
>> is to connect 2 USRPs (USRPN200 and USRP2) via a MIMO cable (available at
>> Then, we configure each USRP separately to monitor 50MHz of bandwidth (8bit
>> per sample).
>> My question:
>> 1- is it possible to configure each USRP separately to monitor different
>> spectrum segment? Example, USRPN200 senses 2400MHz to 2450MHz and USRP2
>> sense 2450MHz up to 2500MHz.
>> If this is possible, is it possible to get the samples over one GigaBit
>> Ethernet cable (i.e. connected to one USRP device)? Or we may need to take
>> a cable out of each device and connect them to a switch, which feeds the
>> host ?
>> 2- is it possible to connect USRPN200 with USRP2 via a MIMO cable? Or we
>> need to use two USRP devices of the same type? like two of USRPN200 or two
>> of USRP2.
>> Wahhab Albazrqaoe
>> USRP-users mailing list
>> USRP-users at lists.ettus.com
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