[USRP-users] Sync two USRP devices to sense 100MHz of spectrum

Wahhab Albazrqaoe 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),
right?
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?

Best,
Wahhab

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.
> http://files.ettus.com/manual/page_usrp2.html#usrp2_mimocable
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__files.ettus.com_manual_page-5Fusrp2.html-23usrp2-5Fmimocable&d=DwMFaQ&c=nE__W8dFE-shTxStwXtp0A&r=Tlms1z6tKiruwUlcy5dGsCCn_nZvNYIamSz8XsFHSRs&m=VGOSWfv9tGkGmMnimSB1CdXINqvkCsEy9vnk0K6qq0M&s=u0ke8LMqaemeiYKZA49AdF5DAzQavZgSuReDgT8yQx8&e=>
>
> 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.
>
> Regards,
> Derek
>
>
> 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
>> ettus.com
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__ettus.com&d=DwMFaQ&c=nE__W8dFE-shTxStwXtp0A&r=Tlms1z6tKiruwUlcy5dGsCCn_nZvNYIamSz8XsFHSRs&m=VGOSWfv9tGkGmMnimSB1CdXINqvkCsEy9vnk0K6qq0M&s=PSyPhuuc6w7iP77pKr2zZ4IPIUy5TJxL8odqr6wBua8&e=>).
>> 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.
>>
>> Thanks
>> Wahhab Albazrqaoe
>>
>> _______________________________________________
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>> USRP-users at lists.ettus.com
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.ettus.com_mailman_listinfo_usrp-2Dusers-5Flists.ettus.com&d=DwMFaQ&c=nE__W8dFE-shTxStwXtp0A&r=Tlms1z6tKiruwUlcy5dGsCCn_nZvNYIamSz8XsFHSRs&m=VGOSWfv9tGkGmMnimSB1CdXINqvkCsEy9vnk0K6qq0M&s=UDrnn2_SdXQRAou4zuu0Q6u5SVQBZwepHogZ0taR6Xw&e=>
>>
>>
>
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