Thank you Marc,

* Ok I will try using a common clock ref and input PPS

* Scheduling the transmit and receive  to within one tick of the 100 MHz
ADC clock: Can that be done into the host GNU radio code or am supposed to
move the code to the FPGA.

* Is that the samples count method to get accurate time-stamping ?

* Can you please explain to me more about the concept of cross
correlating transmitted
and received samples.



2013/5/3 mepard [via GnuRadio] <ml-node+s4n41143...@n7.nabble.com>

> Hint 1:  If both 210s are on the same PPS and frequency reference and the
> FPGA clocks are synchronized to the PPS, you can schedule the transmit and
> receive to within one tick of the 100 MHz ADC clock.
> Hint 2:  Cross correlate the transmitted and received samples. The lag
> will be independent of Ethernet and IP delays.
>
> -Marc
>
>
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