[USRP-users] USRP X310 GPS or IEEE 1588 Synchronization

akin soysal akinsoysal at gmail.com
Fri Mar 1 01:24:32 EST 2019


Hello,

I know that the 10GbE ethernet interface is adding an extra 500us round
trip time delay with fiber DAC. I tested it myself. 1 GbE would probably
give a similar delay as well. So do you think it would stay below our delay
budget of 250us?

Regards,
Akın

On Fri, 1 Mar 2019 00:24 Nate Temple <nate.temple at ettus.com wrote:

> Hi Rob,
>
> Yes, that's correct, you can use the WR-LEN with the X310.
>
> Regards,
> Nate Temple
>
>
>
>
>
>
> On Wed, Feb 27, 2019 at 12:40 PM Rob Kossler <rkossler at nd.edu> wrote:
>
>> Nate,
>> Although the X3xx series to not natively support White Rabbit, I believe
>> that they can get all of the benefits by using a WR-LEN in close proximity
>> to the X310.  Is that correct?
>>
>> Rob
>>
>> On Wed, Feb 27, 2019 at 11:45 AM Nate Temple via USRP-users <
>> usrp-users at lists.ettus.com> wrote:
>>
>>> Hi Akin,
>>>
>>> The Octoclock-G would be suitable for this purpose, and yes, it does
>>> contain a GPSDO (OCXO). https://kb.ettus.com/GPSDO#GPSDO_.28OCXO.29
>>>
>>> The Octoclock-G does not contain an antenna, you must provide one to the
>>> GPS Antenna input (SMA).
>>>
>>> The X3xx series do not support IEEE 1588, however, the N3xx series USRPs
>>> do support White Rabbit, which is an extension of the IEEE-1588-2008
>>> standard. More info can be found here on it
>>> https://kb.ettus.com/Using_Ethernet-Based_Synchronization_on_the_USRP%E2%84%A2_N3xx_Devices
>>>
>>>
>>> Regards,
>>> Nate Temple
>>>
>>> On Wed, Feb 27, 2019 at 8:31 AM akin soysal via USRP-users <
>>> usrp-users at lists.ettus.com> wrote:
>>>
>>>> Hello All,
>>>>
>>>>
>>>> I have a question. We want to synchronize the clock of the two USRP
>>>> X310s with a GPS or IEEE 1588 standard. I would like to synchronize the two
>>>> USRPs with each other so that the base station and user terminal would not
>>>> experience any synchronization issue. I also would like to synchronize one
>>>> of the USRP X310s with an external base station, which supports IEEE 1588
>>>> and GPS clocks, and we have a synchronization budget of about *250us*.
>>>>
>>>>
>>>> I learned that the setup that worked in France is using the following
>>>> Ettus product:
>>>>
>>>>
>>>> https://www.ettus.com/product/details/OctoClock-G
>>>>
>>>>
>>>> Do you think that this would suffice for our needs? It has its own GPS
>>>> clock and antenna inside, right? It is compatible with USRP X310?
>>>>
>>>>
>>>> I know that the product specification does not include IEEE 1588, so I
>>>> am concluding that it would not be possible to use this standard for our
>>>> scenario, do you agree?
>>>>
>>>> Thanks and regards,
>>>>
>>>> Akın
>>>> _______________________________________________
>>>> USRP-users mailing list
>>>> USRP-users at lists.ettus.com
>>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>>>
>>> _______________________________________________
>>> USRP-users mailing list
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>>
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