[time-nuts] Synchronization

[Anton Strydom]

HI Bob

I do not require timing on the USB at all


On Thu, Dec 5, 2019 at 6:00 PM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> One timing issue could be that USB is not that great for timing. Since it
> is
> packet based it introduces jitter in the link. Running NTP on a
> “traditional”
> RPi is unlikely to produce numbers below a milisecond.
>
> Indeed I’m digging into that for what I’m working on …..
>
> Bob
>
> > On Dec 5, 2019, at 12:09 AM, Anton Strydom <agstrydom at gmail.com> wrote:
> >
> > Good day Hal
> >
> > Thank you for your contribution
> >
> > The physical setup is as follows, each Rp1 has 2 or more cameras attached
> > to it via a multiplexer or usb depending on the camera, there are a
> number
> > of V2 RPi and also a couple of USB cameras attached to some of the RPi's.
> > All the equipment is powered by solar
> >
> > I will be able to run cable but it is going to be difficult plus the
> > possibility that the cables and equipment attached to it will be stolen
> is
> > 100% hence the WiFi
> >
> > Yours sincerely
> >
> > Anton
> >
> >
> >
> > On Thu, Dec 5, 2019 at 3:01 AM Hal Murray <hmurray at megapathdsl.net>
> wrote:
> >
> >>
> >> agstrydom at gmail.com said:
> >>> The cameras are pairs sitting on a multiplexer so the problem is not
> the
> >>> camera pair synchronization but the RPi synchronization
> >>
> >> I don't understand the physical setup.  Is it possible to run a cable to
> >> wherever you need good time?
> >>
> >> Even if that isn't practical in the long run, it might be useful for
> >> experimenting.
> >>
> >>
> >> --
> >> These are my opinions.  I hate spam.
> >>
> >>
> >>
> >>
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