[srsran-users] Multiple USRPs in a single host

Wed Jan 12 09:13:28 UTC 2022

I recommend loading the XG FPGA image. Each XGE port will have different IP
addresses: 192.168.30.2 and 192.168.40.2. Then use a different port for
each X300. Then configure the XGE host card interfaces with 192.168.30.1
and 192.168.40.1. This will make the trick without having to modify the
USRP EEPROM (more here https://files.ettus.com/manual/page_usrp_x3x0.html).

The arguments look like:
device_args =
type=x300,master_clock_rate=184.32e6,clock=external,addr0=192.168.30.2,addr1=192.168.40.2
I did not mention earlier that an external clock and PPS are required.

Also, if you want to change the UHD version several times, I recommend
programming the FPGA through VIvado Lab (free, requires USB cable). This
takes <10s and there is no way you can brick the device. However, the FPGA
image is gone after a power cycle. I can provide a script for that if you
need it.

Regards,
Xavier

On Wed, 12 Jan 2022 at 07:27, Jordi Baranda <jorge.baranda at cttc.es> wrote:

> Hi Xavier,
>
> Thanks you very much for your quick answer and the pointer. I think I will
> need more help.
>
> As I read in the link, it talks about combining USRPs into a single
> device, but the idea is to have multiple USRPs (e.g. 2) connected to a host
> and specify which one use you want to use when launching an enodeB process.
> However, as I understand from the webpage, you could assign different IP
> address to each USRP and then your suggestions is to specify it through the
> "rf.device_args" property, isn't it?
>
> I am in the process of building the mentioned scenario (for the moment I
> am working with zmq), so I think that if it works as mentioned before, I
> think it would be very useful if you could share an example of the string
> needed to launch the enodeb process in this case, specially for the
> "rf.device_args" to specify using a USRP in a different address than the
> default one (and any other parameters that would need to be specified
> rather than the default ones).
>
> Again, thank you very much
>
> Best regards,
>
> Jordi
> On 11/01/2022 18:44, Xavier Arteaga wrote:
>
> Hi Jordi,
> First of all, many thanks for your interest.
>
> It is possible with X300 series. Use rf.device_args property to configure
> the RF front end. This page may help you:
> https://files.ettus.com/manual/page_multiple.html
>
> As this functionality is for expert usage, it could be that some more
> device arguments are required. Let me know if you need more help.
>
> Kind regards,
> Xavier
>
>
>
> On Tue, 11 Jan 2022 at 17:03, Jordi Baranda <jorge.baranda at cttc.es> wrote:
>
>> Dear srsran-users,
>>
>> I am starting to play with srsran and I am contacting you to ask if (and
>> how) when launching a srsran enodeB process you could select the USRP to
>> use if multiple USRPs are connected to the host running the enodeB process.
>>
>> Thanks you very much in advance for your time and attention,
>>
>> Best regards,
>>
>> Jordi
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>>
>>
>>
>> *Jorge Baranda*
>> Researcher (R2C), PhD
>> jorge.baranda at cttc.cat
>>
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> --
> [image: CTTC Logo]
>
>
>
>
>
> *Jorge Baranda*
> Researcher (R2C), PhD
> jorge.baranda at cttc.cat
>
> Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
> Av. Carl Friedrich Gauss, 7 - Building B4
> 08860 - Castelldefels
> Tel.: +34 93 645 29 00
>
> *DATA PROTECTION INFORMATION. Data controller: CENTRE TECNOLOGIC DE
> TELECOMUNICACIONS DE CATALUNYA (G62616586):*
>
> We inform you that your identification data and the data contained in the
> emails and attached files can be incorporated into our databases, in order
> to maintain professional and / or commercial relationships, and that it
> will be preserved throughout the relationship. According to the current
> regulations, you can exercise your right to access, rectification, erasure,
> restriction of processing, to portability and to object by sending an email
> to dpo at cttc.cat.
> This message and any attached document, where appropriate, may be
> confidential and intended for the original recipient only.
>
> L'informem que les seves dades identificatives i les compreses als correus
> electrònics i fitxers adjunts poden ser incorporades a les nostres bases de
> dades amb la finalitat de mantenir relacions professionals i/o comercials
> i, que seran conservades mentre es mantingui aquesta relació. Si ho
> desitja, pot exercir el seu dret d'accés, rectificació, supressió,
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> Before printing this e-mail or attachments, be sure it is necessary. It is
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