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Re: [Discuss-gnuradio] Synchronization between two E100 devices

From: Nick Foster
Subject: Re: [Discuss-gnuradio] Synchronization between two E100 devices
Date: Mon, 26 Sep 2011 10:00:15 -0700

On Mon, Sep 26, 2011 at 8:52 AM, ziyang <address@hidden> wrote:
> Hi everyone,
> I'm trying to synchronize two E100 devices, both connecting to the ethernet.
> According to the Synchronization Application Notes of UHD, there are a
> couple of methods to do it. But the problem is that I don't have access to
> either an external GPSDO or a reference clock signal.
> I tried to access both devices by providing the IP address of
> uhd_usrp_source/sink, then set the time of them using the set_time_now()
> method. But it turned out that another m'board is not accessible to the host
> device.
> So I was wondering, under this circumstances, is there a way to synchronize
> the device time of two E100s?

If you need them to be truly synchronized, then the only way to do it
is by distributing an accurate PPS and 10MHz reference to them.
Issuing set_time_now() "simultaneously" to two devices will get you
within some microseconds, but not synchronize them at the sample


> Thanks in advance,
> Terry
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