[time-nuts] inexpensive fiber optic distribution

[paul swed]

I wondered when the conversion factor noise was going to show up in the
conversation. I had asked time-nuts about this a long time ago. I was
experimenting with optical isolation since lightning seems to be my friend.
Ended up with minicircuit transformers and cable. Later discovered an HP
article something like 1987 that showed how to do the conversion with the
optical units of the time. I did tinker with SFPs and it was painful due to
the connectors. So seeing the nice boards that have been made was great and
just maybe enough to get me to make a set of boards to experiment with
again.
Great thread.
Regards
Paul
WB8TSL

On Fri, Mar 22, 2019 at 6:01 AM Hal Murray <hmurray at megapathdsl.net> wrote:

>
> bownes at gmail.com said:
> > The infrastructure is easily enough interfaced to, even a simple
> > microprocessor can do it, using switches allows for distribution with
> known
> > characteristics.
>
> It would be interesting to  measure the delays through a switch.
>
> The switches are retiming the data stream.  It has to buffer up enough
> data
> before it starts sending to make sure that it won't run out before the end
> of
> packet if the switch clock is fast and the source clock is slow.  There is
> also bit/byte synchronization, and crossing a clock boundary before things
> get
> started.
>
>
>
> --
> These are my opinions.  I hate spam.
>
>
>
>
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