[time-nuts] Frequency over fiber (was WWV and legal issues)

Dana Whitlow k8yumdoober at gmail.com
Sun Sep 2 16:09:07 EDT 2018


Question:

Supposing you buy a bundle of a couple of dozen fibers inside one outer
jacket:  Can
anyone give me an idea of how well the individual fibers are likely to be
matched in
delay, and in delay tempco?

Dana


On Sun, Sep 2, 2018 at 1:46 PM Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:

> --------
>
> In message <C3C70D17-3E2D-44C6-924C-F780B2245CEB at n1k.org>, Bob kb8tq
> writes:
>
> > That’s why they design a certain amount of “slack” into the structure.
>
> As far as I know, thermal expansion and contact losses are far
> bigger dimensioning factors, except for a few very active fault-lines.
>
> At these fault-lines and/or with very important fibers, special and
> site-specific precautions are usually taken.
>
> For terrestial faultlines, the cheapest and easiest mitigation is
> to cross the fault-line on poles with a slack messengerwire.
>
> For oceanfloor faultlines, plenty of slack and an oblique crossing
> is the best we've come up with yet.
>
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
>
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