Tnx Marcus for your answer
but i dont mean synchronization of two usrp ....when u set tag for Tx-time on 
burst, usrp when the time arrives , transmitt the burst .... but in reality it 
take some times to burst reaches to antenna and propagate (Actual 
Transmission)and this delay is completely random, how can i compensate this 
delay??

    On Tuesday, June 12, 2018, 5:37:14 PM GMT+4:30, Marcus Müller 
<marcus.muel...@ettus.com> wrote:  
 
 >Dear Amirhosein!

>the time synchronization methods mentioned in 
>http://files.ettus.com/manual/page_sync.html
>solve that: it doesn't matter when you put the data on Ethernet, the
>USRP will send it when the time set for transmission is reached.
>
>Best regards,
>Marcus
>
>On Tue, 2018-06-12 at 09:27 +0000, Amirhosein naseri via USRP-users
>wrote:
>> Hello everybody
>> 
>> How can i solve transmit latency over Ethernet in USRP N210 for
>> timestamped bursts??
>> As u know amount of this latency is not constant and change over time
>> ...
>> 
>> Tnx.
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