[time-nuts] Re: Query about List and about 10 MHz Distro

[Bill Notfaded]

White rabbit seems pretty good for time synced over fiber.  PTP with
enhanced stability profile.  It's a IEEE standard.  It seems to work for
CERN.  Lately I've been looking at Cisco devices that can support it.  It
whould be nice if I could find hardware that'll support it more easily...
Maybe it'll come soon?

If you need optics I highly recommend AMC optics they'll code (Cisco,
Intel, NetApp) SFP+ and QSFP for any vendor you want.  Prices are great and
it's all made the USA no relation to me.  I've been getting into 100G
Ethernet over OM4 fiber.  The new profile for PTP over fiber is legit.

Bill


On Sat, Aug 28, 2021, 12:04 PM Dana Whitlow <k8yumdoober at gmail.com> wrote:

> I was looking for something similar about 18 months or so ago.  Although I
> haven't taken any
> action yet, I concluded that one could do a nice job for under $200 per
> segment, including the
> transmitter and receiver modules and lots of connectorized multimode
> fiber.  What I *don't* know
> is what the phase noise performance would be, except that I do know that
> the fiber's VF *is*
> materially influenced by temperature.
>
> I was looking primarily at the HFBR-2416 for the fiber receiver, and the
> HFBR-1412 (standard
> power) or the HFBR-1414 (high power option) for the transmitter   Unlike
> most of the available
> models, these are fundamentally analog devices, meaning that you can
> transmit sinewave
> 10 MHz through them.  At the time I was looking, Mouser was selling these
> for about $20 each.
>
> See the datasheet at
> https://www.mouser.com/datasheet/2/678/AV02-0176EN_2019-02-15-1827546.pdf
> with particular attention to page 21 regarding the HFBR-2416 receiver.
>
> I was also looking at Fiber Instrument Sales for patch cords.  We bought a
> lot of fiber stuff from
> them at Arecibo, and I was always happy with them.  See:
>
> https://www.fiberinstrumentsales.com/catalog-cable-assemblies?gclid=Cj0KCQjwvaeJBhCvARIsABgTDM7eNTkP2nQbyFzhcwDE38VnSEP879MBKV1ZyDq2YrnEtOn7_VfzjbkaAtpfEALw_wcB
>
> Somebody had pointed out yet another source of connectorized fibers ("patch
> cords") to me, but I cannot find the name
> at the moment.
>
> Dana   K8YUM
>
>
> On Sat, Aug 28, 2021 at 11:52 AM AC0XU (Jim) <James.Schatzman at ac0xu.com>
> wrote:
>
> > I am hoping that you can help me about a couple of things:
> >
> > 1) My time-nuts summaries sometimes appear unformatted and unreadable.
> All
> > the text from all the postings is crammed together without spacing. How
> can
> > I fix it?
> >
> > 2) I want to distribute 10 MHz references by fiber. There are
> > RF-over-Fiber products available, but too expensive for me (thousands of
> > $$$ per xmit/rcv set).  I am thinking that it should be possible to use
> > fiber Ethernet components to do this. I don't mean IEEE 1588 but a much
> > simpler, no-computer-required, solution. Possibly just converting sine
> wave
> > (coax) to square wave (fiber) to sine wave (coax). I am looking for a low
> > cost solution. Any thoughts or recommendations??
> >
> > Thanks!
> >
> > Jim
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