[time-nuts] Re: TimeStick

[Ed Marciniak]

It seems to me that the raspberry pi compute module 4 uses an Ethernet chip that supports PTP and that the carrier board broke out one pin and you could choose input or output.

If this module doesn’t support an input pin for PTP, there are other options.
________________________________
From: Steven Sommars via time-nuts <time-nuts at lists.febo.com>
Sent: Thursday, October 10, 2024 8:47:33 PM
To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
Cc: Steven Sommars <stevesommarsntp at gmail.com>
Subject: [time-nuts] Re: TimeStick

Won't the USB between the host and the Ethernet side of the TimeStick limit
accuracy to a few microseconds at best?

If the goal is to distribute accurate PPS won't boundary clocks be needed?

The TimeStick will be great for experimenters, though.



On Thu, Oct 10, 2024 at 7:26 PM Jim Lux via time-nuts <
time-nuts at lists.febo.com> wrote:

>
>
>
>
>
> It's unclear if this is a time source (i.e. you've got a grandmaster or
> such running PTP and sending time, and this widget receives it and puts out
> 1pps.  Or can it be a sender - I cobble up a bunch of stuff from my
> collection of masers and fountain clocks in my underground lair, and I can
> send that highly accurate tick to the rest of the (connected by cabled
> ethernet) world?
>
> beaks out 1pps is ambiguous
>
>
> On Wed, 9 Oct 2024 05:05:12 +0200, Magnus Danielson via time-nuts <
> time-nuts at lists.febo.com> wrote:
>
> Hi Paul,
>
> Yes. I think the presentation on the web leaves a little more to desire,
> so I will ask Ahmed to improve that, as I think it should not be too
> difficult to achieve.
>
> While many do not have PTP timing in their labs, it is becoming more and
> more ubiquious so it is interesing when the entry level is so low. With
> this little device you can do your normal TI-counter measurement even
> for a PTP source. Exactly how much it filters, add noise and add time
> bias, I do not know, yet.
>
> I find it interesting that the PPS is such a common reference
> measurement point, it keep showing up in packet timing solutions as a
> reference point, including the ITU-T standards.
>
> Cheers,
> Magnus
>
> On 2024-10-08 14:57, paul swed wrote:
> > Magnus that is amazing and it seems to be $29. That is hard to believe.
> > Appreciate you sharing.
> > Paul
> > WB8TSL
> >
> > On Tue, Oct 8, 2024 at 1:24 AM Magnus Danielson via time-nuts
> >  wrote:
> >
> > Fellow time-nuts,
> >
> > As my travels brings me to ISPCS conference and plugfest in Tokyo,
> > they
> > hand out these nifty little devices called the TimeStick.
> >
> > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.time-2Dstick.com_about-2D2&d=DwIGaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=JsDsKeR7cZC8wbZhIlxxBQ&m=MGoKVEoKMI-KU9FLZdk71mlWndKDNvYEN3asqXn8L3I240Y7lTAtNTmOvT3zDHna&s=99K2hSXfLSCZ1ys5l5cgYsOpr4LZVrQgHKgMLYWwWI8&e=
> >
> > Really cool little device!
> >
> > I thought you guys would enjoy learning about it.
> >
> > Best Regards,
> > Magnus
> > _______________________________________________
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